Tandem Spinal Stenosis

Development of a comprehensive treatment algorithm for tandem spinal stenosis: decision making and surgical strategy

BACKGROUND CONTEXT

Tandem spinal stenosis (TSS) can present with a constellation of myriad neurological symptoms and signs. Whole spine MRI has improved the diagnosis but does not aid therapeutic decision-making. While most studies have focused on cervico-lumbar TSS, there is inadequate literature on TSS of other regions. Further, there are no guidelines on the optimal surgical strategy for patients with TSS.

STUDY DESIGN

Retrospective evaluation of prospectively collected data PURPOSE: To develop a clinico-radiological treatment algorithm for TSS involving all the regions of the spine PATIENT SAMPLE: About 238 patients treated for TSS with a minimum follow-up of 2 year.

METHODOLOGY

The patients were classified based on the areas of stenosis namely cervico-lumbar (Type A -186), cervico-thoracic (Type B -11), thoracolumbar (Type C -24), and cervical, thoracic & lumbar (Type D -17). The criteria for diagnosis of TSS were cord compression and T2 signal intensity changes in cervical/ thoracic regions, and/or Schiza's grade ≥C lumbar canal stenosis (LCS). In the sequence of surgical algorithm, clinical severity was taken as the prime factor followed by cord signal changes. In clinical severity, symptoms were given predominance over clinical signs, myelopathy over radiculopathy and proximal over distal compressions. The outcomes were evaluated through Nurick's grade (NG) and ODI.

RESULTS

Type A cervico-lumbar TSS was divided into four sub-types. Type A1-patients with clinical myelopathy without symptoms of LCS underwent cervical decompression alone (n=58). NG improved from 3.8±0.98 to 1.74±0.74 (p<.05). Only 11(18%) required lumbar decompression later. Patients with LCS (Type A2) without clinical myelopathy underwent lumbar decompression alone (n=97). Four (4.1%) developed myelopathy during follow-up requiring a cervical surgery. Patients with predominant LCS symptoms with only signs of myelopathy (Type A3, n=7) underwent lumbar decompression initially but all required cervical surgery within 2 years. Type A4 (n=24) with both myelopathy and claudication symptoms were treated by combined staged decompressions procedures. The NG improved from 3.4±0.7 to 1.6±0.4 (p<.05). Type B (n=11) had patients with myelopathy due to compression at cervical and thoracic regions. They were sub-divided based on upper limb myelopathy. In patients with both upper and lower limb myelopathy (Type B1, n=11), cervical decompression was done first (n=6) followed by staged thoracic decompression. The NG improved from 4.6±0.5 to 1.8±0.3 (p<.05). In patients with predominant lower limb myelopathy (Type B2, n=5), only thoracic surgery was performed. Only one required cervical surgery later. In Type C thoracic & lumbar TSS (n=24), 20 were treated by thoracic decompression based on signs of myelopathy. The mean NG improved from 4.1±0.7 to 1.9±0.9 (p<.05). Six cases required lumbar level surgery later. Four patients who had only LCS symptoms underwent lumbar decompression. Type D with stenosis at all three regions presented variedly, and underwent staged decompression (n=17).

CONCLUSION

Based on clinical features of myelopathy and claudication, along with specific diagnostic MRI criteria, the present study comprehensively classified all possible types of TSS. The algorithm provides specific surgical strategies for each subtype, based on a large cohort of patients. More than MRI evidence of stenosis and signal changes, clinical symptoms and signs were helpful in formulating treatment.

Non-surgical treatment for tandem spinal stenosis: a systematic review protocol

BACKGROUND

Tandem Spinal Stenosis (TSS) is a disease characterised by the narrowing of the spinal canal in two or more non-adjacent areas of the spine, often affecting both the cervical and lumbar vertebrae. Doctors and patients increasingly favour non-surgical treatments that have the function of relieving symptoms and improving outcomes. This systematic review aims to evaluate the effectiveness and safety of non-surgical therapies for TSS and comprehensively summarise existing evidence.

METHODS AND ANALYSIS

We will conduct comprehensive searches, both manual and electronic, of literature published up to 30 September 2024; database searches will commence after the publication of this agreement, with an estimated commencement date of 1 December 2024, and the end date is 31 May 2025, without language restrictions. Key databases such as MEDLINE, PubMed, EMBASE, Web of Science, Cochrane Library, WHO International Clinical Trial Registration Platform, China National Knowledge Infrastructure, China Biomedical Literature Database, China Scientific Journal Database and Wan-Fang Database will be explored. In addition, we will include resources such as library journals and conference abstracts. Following the identification and screening of all randomised controlled trials focusing on non-surgical treatments for TSS, two investigators will perform a meta-analysis of the included studies. The findings will be summarised as the risk ratio for binary data and the standardised or weighted mean difference for continuous data.

ETHICS AND DISSEMINATION

Ethical approval is not required, as the review does not involve individual patient data. The review's findings will provide clinicians with evidence on using non-surgical treatments for TSS, disseminated through peer-reviewed publications or conferences.

PROSPERO REGISTRATION NUMBER

CRD42024496634.

A Nationwide Comparison of Outcomes and Resource Use in Staged vs Simultaneous Cervical and Lumbar Fusions: A Retrospective Database Study

Background: Although the coexistence of cervical and lumbar spinal conditions is fairly common, surgical treatments are usually staged, even though simultaneous fusion of the cervical and lumbar spine may be a viable option for appropriate candidates. Purpose: We sought to investigate the outcomes of staged vs simultaneous cervical and lumbar fusions in terms of differences in postoperative complications and resource use. Methods: We performed a retrospective cohort study using claims data from the 2006 to 2020 all-payer Premier Health Database. Data were extracted for patients who underwent both a cervical and a lumbar fusion procedure either simultaneously (same hospitalization) or staged (within 1 year). Multivariable regression models measured the association between simultaneous or staged procedures and combined complications (including venous thromboembolism, infection, acute renal failure, or vascular/pulmonary/gastrointestinal complications), intensive care unit (ICU) admission, and prolonged length of stay. We report odds ratios (ORs) and 95% confidence intervals (CI). Results: Overall, 560 (5.2%) and 10 187 (94.8%) of total 10 747 cervical and lumbar fusion procedures were performed simultaneously and staged, respectively. When comparing outcomes after simultaneous procedures to those after staged procedures (for which outcomes from the cervical and lumbar procedures were pooled), simultaneous procedures were associated with higher rates of ICU admission and longer hospital stays, but there were no differences in rates of combined complications. Conclusion: Our retrospective, nationwide database study found that simultaneous cervical and lumbar fusion is relatively rare and its rates of complications do not differ meaningfully from those of staged procedures. However, we found an association between simultaneous cervical and lumbar fusion and higher rates of ICU admission and prolonged length of stay. Further study is warranted.

Patient-Reported Outcomes and Complications of Simultaneous versus Staged Surgical Decompression for Tandem Spinal Stenosis

Introduction  Tandem spinal stenosis (TSS) refers to the narrowing of the spinal canal at two distinct anatomic areas. Symptoms can present due to either cervical myelopathy or lumbar stenosis. Consequently, determining the symptomatic anatomical levels requiring surgery can pose a challenge. We sought to identify the surgical approach associated with better patient-reported outcomes. Materials and Methods  The Information Management System was queried using the International Classification of Diseases Ninth and Tenth Edition codes to identify patients who underwent simultaneous or staged decompression surgery for TSS between 2011 and 2020. Patient records were reviewed to collect data on age, sex, comorbidities, surgical approach, modified Japanese Orthopedic Association (mJOA) score, and complications. The mJOA is a validated composite assessment used to quantify postoperative neurological status. Multivariable regression models were utilized to identify factors associated with better postoperative neurological recovery. Results  Among 42 patients included in the analytical cohort, 33 (78.6%) underwent simultaneous cervical and lumbar decompression, while 9 (21.4%) underwent staged decompression (cervical followed by lumbar). The patient's age, sex, comorbid conditions, and American Society of Anesthesiologists level were similar between the two groups. Furthermore, simultaneous decompression was associated with higher blood loss (676.97 vs. 584.44 mL) and an increased need for transfusion (259.09 vs. 111.11 mL) compared with staged decompression. Moreover, patients who underwent simultaneous decompression experienced a higher number of postoperative complications (10 vs. 1; p  = 0.024). Notably, postoperative mJOA scores improved in both groups; however, the improvement was more pronounced in the staged group (mJOA score: 15.16% [ ± 2.18] vs. 16.56% [ ± 1.59]). On follow-up visits, patients who underwent staged decompression showed better recovery rates (mJOA score: 78.20% [ ± 24.45] vs. 59.75% [ ± 25.05]). Conclusion  The patient's clinical history and examination findings should be the main determinants of surgical decision-making. Our study showed a slightly higher postoperative mJOA score and a recovery rate with fewer complications in staged decompression of TSS.

[Cervical stenosis-Diagnostics and treatment of symptomatic spinal canal stenosis and neuroforaminal stenosis]

Cervical stenosis is a clinical picture that is regularly encountered by both hospital physicians and orthopedic surgeons in the daily clinical practice. While advanced cervical spinal canal stenosis may lead to myelopathic symptoms in cases of sufficient manifestation and spinal cord injury, neuroforaminal stenosis leads to radicular symptoms due to compression of the nerve roots. The clinical examination can provide initial clues as to the suspected cause of the patient's symptoms; however, reliable diagnostics are based only on sectional imaging of the cervical spine. Depending on the extent of the symptoms, the treatment options vary between nonsurgical treatment for moderate symptoms without neurological deficits and surgical decompression of the spinal cord or nerve roots. The surgical treatment can be performed from anterior or posterior depending on the findings. Surgery can lead to an improvement of the neurological symptoms; however, the primary aim of surgical treatment is to avoid deterioration of the neurological deficits.

Coexisting Lower Back Pain in Patients With Cervical Myelopathy

STUDY DESIGN

Retrospective cohort study.

OBJECTIVE

The aim of the present study is to investigate the coexisting lower back pain (LBP) in patients with cervical myelopathy and to evaluate changes in LBP after cervical spine surgery.

SUMMARY OF BACKGROUND DATA

Only a few studies with a small number of participants have evaluated the association between cervical myelopathy surgery and postoperative improvement in LBP.

METHODS

Patients who underwent primary cervical decompression surgery with or without fusion for myelopathy and completed preoperative and 1-year postoperative questionnaires were reviewed using a prospectively collected database involving 9 tertiary referral hospitals. The questionnaires included the patient-reported Japanese Orthopaedic Association (PRO-JOA) score and Numerical Rating Scales (NRS). The minimum clinically important difference (MCID) for NRS-LBP was defined as >30% improvement from baseline. Patient demographics, characteristics, and PRO-JOA score were compared between patients with and without concurrent LBP, and the contributor to achieving the MCID for LBP was analyzed using logistic regression analysis.

RESULTS

A total of 786 consecutive patients with cervical myelopathy were included, of which 525 (67%) presented with concurrent LBP. LBP was associated with a higher body mass index ( P <0.001) and worse preoperative PRO-JOA score ( P <0.001). Among the 525 patients with concurrent LBP, the mean postoperative NRS-LBP significantly improved from 4.5±2.4 to 3.4±2.7 ( P <0.01) postoperatively, with 248 (47%) patients reaching the MCID cutoff. Patients with a PRO-JOA recovery rate >50% were more likely to achieve MCID compared with those with a recovery rate <0% (adjusted odd ratio 4.02, P <0.001).

CONCLUSIONS

More than 50% of patients with myelopathy reported improvement in LBP after cervical spine surgery, and 47% achieved the MCID for LBP, which was positively correlated with a better PRO-JOA recovery rate. Treating cervical myelopathy in patients with concomitant LBP may be sufficient to mitigate concomitant LBP.

LEVEL OF EVIDENCE

Level III.

Long-term outcomes of spine surgery in dialysis patients, focusing on activities of daily living, life expectancy, and the risk factors for postoperative mortality

BACKGROUND

Because of the high incidence of major perioperative adverse events, spine surgery in dialysis patients should be recommended carefully after consideration of its risks and benefits. However, the benefits of spine surgery in dialysis patients remain unclear because of the lack of long-term outcomes. The purpose of this study is to elucidate the long-term outcomes of spine surgery in dialysis patients, focusing on activities of daily living (ADLs), life expectancy, and risk factors for postoperative mortality.

METHODS

Data for 65 dialysis patients who underwent spine surgery at our institution and were followed up for a mean duration of 6.2 years were retrospectively reviewed. ADLs, number of surgeries, and survival times were recorded. The postoperative survival rate was calculated using the Kaplan-Meier method, and risk factors for postoperative mortality were investigated using a generalized Wilcoxon test and multivariate Cox proportional-hazards model.

RESULTS

Compared with preoperative ADLs, ADLs significantly improved at discharge after surgery and at the final follow-up. However, 16 of the 65 patients (24.6%) underwent multiple surgeries, and 34 (52.3%) died during the follow-up period. Kaplan-Meier analysis revealed that the survival rate after spine surgery was 95.4% at 1 year, 86.2% at 3 years, 69.6% at 5 years, 59.7% at 7 years, and 28.7% at 10 years, and the overall median survival time was 99 months. Multivariate Cox regression analysis showed that a dialysis period of ≥10 years was a significant risk factor.

CONCLUSIONS

Spine surgery in dialysis patients improved and maintained ADLs in the long term and did not shorten life expectancy. However, dialysis patients undergoing spine surgery require multiple surgeries more frequently, and a dialysis period of ≥10 years is a significant risk factor for postoperative mortality.

Meta-Analysis of Simultaneous versus Staged Decompression of Stenotic Regions in Patients with Tandem Spinal Stenosis

BACKGROUND

Tandem spinal stenosis (TSS) refers to simultaneous spinal canal stenosis of noncontiguous regions. There is no consensus in the surgical strategies for patients with symptomatic TSS because of the confusing clinical manifestations. This meta-analysis aimed to compare the outcomes of 1-stage and 2-stage decompression of all stenotic regions (cervical and lumbar/thoracic segments) in patients with TSS.

METHODS

A systematic review was conducted, and a comprehensive literature search with the Japanese Orthopedic Association score, was carried out using MEDLINE, Web of Science, and PubMed databases from inception to September 13, 2022. Observational studies reporting the outcomes after 1-stage or 2-stage decompression of all symptomatic regions were included. Possible heterogeneity among studies was assessed by the Higgins I2 test, and heterogeneity was statistically investigated using the Q statistic.

RESULTS

Thirteen retrospective observational studies were included in this meta-analysis. Meta-analysis showed that there was no significant difference in the Japanese Orthopedic Association score improvement in patients with TSS involving either the cervical-thoracic or cervical-lumbar segments. Regarding the surgical parameters and complications, 1-stage decompression showed comparable operation time, blood loss, and major complications to 2-stage decompression in patients with cervical and lumbar TSS. In patients with cervical and thoracic TSS, 1-stage decompression had significant advantages compared with 2-stage decompression in operation time, blood loss, and major complications.

CONCLUSIONS

For patients with cervical and lumbar TSS, 2-stage decompression showed slight advantages in clinical outcome without exposing patients to unnecessary surgical risks. For patients with cervical and thoracic TSS, 1-stage decompression showed comparable clinical outcome, although with better operative parameters and lower complication rate than in simultaneous decompression.

Japanese Orthopaedic Association (JOA) clinical practice guidelines on the management of lumbar spinal stenosis, 2021 - Secondary publication

BACKGROUND

The Japanese Orthopaedic Association (JOA) guideline for the management of lumbar spinal stenosis (LSS) was first published in 2011. Since then, the medical care system for LSS has changed and many new articles regarding the epidemiology and diagnostics of LSS, conservative treatments such as new pharmacotherapy and physical therapy, and surgical treatments including minimally invasive surgery have been published. In addition, various issues need to be examined, such as verification of patient-reported outcome measures, and the economic effect of revised medical management of patients with lumbar spinal disorders. Accordingly, in 2019 the JOA clinical guidelines committee decided to update the guideline and consequently established a formulation committee. The purpose of this study was to describe the formulation we implemented for the revision of the guideline, incorporating the recent advances of evidence-based medicine.

METHODS

The JOA LSS guideline formulation committee revised the previous guideline based on the method for preparing clinical guidelines in Japan proposed by the Medical Information Network Distribution Service in 2017. Background and clinical questions were determined followed by a literature search related to each question. Appropriate articles based on keywords were selected from all the searched literature. Using prepared structured abstracts, systematic reviews and meta-analyses were performed. The strength of evidence and recommendations for each clinical question was decided by the committee members.

RESULTS

Eight background and 15 clinical questions were determined. Answers and explanations were described for the background questions. For each clinical question, the strength of evidence and the recommendation were both decided, and an explanation was provided.

CONCLUSIONS

The 2021 clinical practice guideline for the management of LSS was completed according to the latest evidence-based medicine. We expect that this guideline will be useful for all medical providers as an index in daily medical care, as well as for patients with LSS.

Outcomes in surgical treatment for tandem spinal stenosis: systematic literature review

BACKGROUND CONTEXT

Tandem spinal stenosis (TSS) refers to a narrowing of the spinal canal in distinct, noncontiguous regions. TSS most commonly occurs in the cervical and lumbar regions. Decompressive surgery is indicated for those with cervical myelopathy or persistent symptoms from lumbar stenosis despite conservative management. Surgical management typically involves staged procedures, with cervical decompression taking precedence in most cases, followed by lumbar decompression at a later time. However, several studies have shown favorable outcomes in simultaneous decompression.

PURPOSE

The aim of this study is to provide a literature review and compare surgical outcomes in patients undergoing staged vs simultaneous surgery for TSS.

STUDY DESIGN/SETTING

Systematic literature review.

METHODS

A systematic review using PRISMA guidelines to identify original research articles for tandem spinal stenosis. PubMed, Cochrane, Ovid, Scopus, and Web of Science were used for electronic literature search. Original articles from 2005 to 2021 with more than eight adult patients treated surgically for cervical and lumbar TSS in staged or simultaneous procedures were included. Articles including pediatric patients, primarily thoracic stenosis, stenosis secondary to neoplasm or infectious disease, minimally invasive surgery, and non-English language were excluded. Demographic, perioperative, complications, functional outcome, and neurologic outcome data including mJOA (modified Japanese Orthopaedic Association), Nurick grade (NG), and ODI (Oswestry disability index), were extracted and summarized.

RESULTS

A total of 667 articles were initially identified. After preliminary screening, 21 articles underwent full-text screening. Ten articles met our inclusion criteria. A total of 831 patients were included, 571 (68%) of them underwent staged procedures, and 260 (32%) underwent simultaneous procedures for TSS. Mean follow-ups ranged from 12 to 85 months. There was no difference in estimated blood loss (EBL) between staged and simultaneous groups (p=.639). Simultaneous surgeries had shorter surgical time than staged surgeries (p<.001). Mean changes in mJOA, NG, and ODI was comparable between staged and simultaneous groups. Complications were similar between the groups. There were more major complications reported in simultaneous operations, although this was not statistically significant (p=.301).

CONCLUSION

Staged and simultaneous surgery for TSS have comparable perioperative, functional, and neurologic outcomes, as well as complication rates. Careful selection of candidates for simultaneous surgery may reduce the length of stay and consolidate rehabilitation, thereby reducing hospital-associated costs.

Radiographic predictors for recurrence of lumbar symptoms after prioritized cervical surgery in patients with tandem spinal stenosis

OBJECTIVES

The purpose of the current study was to explore radiographic predictors for recurrence of lumbar symptoms after prioritized cervical surgery in patients with tandem spinal stenosis (TSS).

METHODS

The current retrospective cohort study included 74 patients with TSS, who underwent prioritized cervical surgery. Based on presence or absence of improvement in lower limb symptoms, patients were grouped into improved and non-improved groups. Medical records and radiological parameters including age, sex, body mass index, cervical and lumbar parameters were analyzed. In improved group, patients were divided into relapsed and non-relapsed groups based on recurrence in lower limb symptoms.

RESULTS

Lumbar symptoms improved in 70.1% (n = 52) of patients. Comparison between the improved and non-improved group showed that there were no statistically significant differences in cervical parameters while comparisons between the relapsed and non-relapsed groups showed significant differences in redundant nerve roots (RNRs) (p = 0.029), narrow segment (p = 0.042) and lumbar stenosis index (LSI) (p = 0.003). In multivariate logistic regression analysis, LSI > 10 (p = 0.016) was independently associated with recurrence of lumbar symptoms.

CONCLUSIONS

Finding of the current study indicated that LSI > 10 was associated with recurrence of lumbar symptoms in TSS patients following cervical surgery.

Moving Beyond the Neck and Arm: The Pain Experience of People With Degenerative Cervical Myelopathy Who Have Pain

STUDY DESIGN

Cross-sectional internet survey of people living with degenerative cervical myelopathy.

OBJECTIVE

The purpose of this study was to quantify pain distribution, severity, and interference in persons with degenerative cervical myelopathy.

METHODS

Eighty-two participants with degenerative cervical myelopathy were recruited for this internet survey. This survey utilized the Michigan Body Map and brief pain inventory (BPI) to assess anatomical distribution and severity of pain as well as the patient derived modified Japanese Orthopedic Association scale (p-mJOA) for myelopathic severity and SF-36 for measures of health-related quality of life. Internal consistency was evaluated with Cronbach's alpha. Pearson's correlations were assessed with p-mJOA and SF-36. Multivariate analysis of variance was used to determine if history of prior surgery or concomitant pain diagnosis impacted experience of pain.

RESULTS

Michigan body map distribution and brief pain inventory severity and interference were correlated with p-mJOA and SF-36 scores (p < 0.05). Pain was moderate to severe in 78% of participants. Pain was commonly widespread. Pain scales were sufficiently internally consistent (α > 0.9). History of surgery or other pain diagnosis did not impact experience of pain in myelopathy.

CONCLUSIONS

Pain is commonly identifiable in large areas of the body, is frequently moderate to severe in intensity and impacts quality of life and severity of myelopathy in a cohort of individuals with myelopathy who have pain.

Patient-Reported Outcomes for Lumbar Fusion in Patients with Previously Treated Cervical Myelopathy

BACKGROUND

Patients with a history of surgically treated cervical myelopathy and lumbar pathology requiring fusion present complex challenges, and literature describing patient-reported outcomes in this cohort beyond patients with tandem spinal stenosis is sparse. This has led to unclear guidelines in the literature. We present the first dataset comparing patient-reported outcomes for lumbar fusion in patients with isolated lumbar pathology versus patients with a history of surgically treated cervical myelopathy.

METHODS

In this retrospective cohort study of a prospectively collected lumbar fusion database, variables of interest included demographics, comorbidities, type and levels of fusion, Oswestry Disability Index (ODI), and minimal clinically important difference.

RESULTS

Of 325 patients identified, 309 met inclusion criteria. Of these, 29 patients had previous cervical surgery to address cervical myelopathy. Median time between cervical and lumbar surgery was 4.0 years (range, 0.3-19.7). There was no statistical difference in preoperative ODI score (24.8 vs. 25.6, P = 0.687), 6-month postoperative ODI score (17.3 vs. 18.7, P = 0.459), change in ODI score (7.5 vs. 6.9, P = 0.673), or minimal clinically important difference for ODI score (62.1% vs. 58.6%, P = 0.710) in patients who had undergone cervical surgery versus patients who had not.

CONCLUSIONS

Patients with a history of previously treated cervical myelopathy have a similar rate of clinically relevant improvement after lumbar fusion compared with patients without such history. As such, these patients appear to benefit from lumbar fusion surgery to the same degree as patients without a history of surgically treated cervical myelopathy.

Simultaneous decompression of all stenotic regions versus decompression of only the most symptomatic region in patients with tandem spinal stenosis: a systematic review and meta-analysis

PURPOSE

Selection of anatomic region of spine for decompression in patients with symptomatic tandem spinal stenosis (TSS) remains a challenge due to the confusing clinical presentation as well as uncertain evidence. A systematic review and meta-analysis of observational studies were conducted to compare the outcomes between simultaneous decompression of all stenotic regions (cervical and lumbar, Group 1) and decompression of only the most symptomatic stenotic region (cervical/lumbar, Group 2) in patients with TSS.

METHODS

A systematic review was conducted, and a comprehensive literature search with well-established inclusion and exclusion criteria with JOA score as an outcome measure was done on PubMed, Google Scholar, and EMBASE database (till January 2021). Observational studies reporting outcomes after simultaneous decompression or only the most symptomatic region were included. NIH quality assessment tool was used to check the quality of each study, and treatment effects were calculated using Dersimonian and Laird random effects model.

RESULTS

Ten studies were included in the analysis out of which all were retrospective observational studies (Level 4 evidence) except one (Level 3 evidence). Overall proportional meta-analysis showed no significant difference in change in JOA scores, operative time, blood loss, total and major complications between Group 1 and Group 2. However, minor complications were significantly increased on performing decompression of both regions simultaneously (p = 0.04). On performing subgroup analysis comparing cervical surgery cohort with lumbar surgery cohort, no difference was found in change in JOA score and requirement of second-stage surgery.

CONCLUSION

Decompression of the most symptomatic region alone irrespective of its location has equal clinical outcomes with less complication rate than simultaneous decompression in patients with TSS.

Single-Site Retrospective Assessment of Surgical Outcomes in Non-Ambulatory Patients with Degenerative Cervical Myelopathy

STUDY DESIGN

A retrospective study of surgical outcomes in patients with degenerative cervical myelopathy (DCM).

OBJECTIVE

To better characterize outcomes following cervical decompression in those with severe, non-ambulatory forms of DCM.

SUMMARY OF BACKGROUND DATA

DCM represents a collection of age-related degenerative processes of the cervical spine that can result in motor, sensory, and autonomic dysfunction, leading to significant reductions in quality of life. Individuals with severe, non-ambulatory forms of DCM are often treated with spinal decompression although the extent of neurological improvement for this patient population is unclear.

METHODS

A retrospective analysis of 48 non-consecutive non-ambulatory patients who underwent cervical decompression surgery between January 2007 and December 2018. Paired t tests and Wilcoxon signed rank tests were used to compare Nurick grade and modified Japanese Orthopedic Association (mJOA) score before and after surgery. Patient demographics, operative details, and postsurgical complications were analyzed using descriptive statistics.

RESULTS

Patients experienced significant improvements in both Nurick grade and mJOA score following cervical decompression surgery. The mean Nurick grade improved from 4.10 ± 0.31 to 2.21 ± 0.82 (P < 0.001, paired t test; 95% confidence interval [CI] -2.08 to -1.71), while the mean mJOA score improved from 10.58 ± 1.51 to 13.60 ± 1.58 (P < 0.001, paired t test; 95% CI 2.59-3.45). The average follow-up duration was 2.50 ± 1.83 years. Following surgery, 44 of the 48 patients in the study gained the ability to ambulate without the aid of a walking frame or someone else's assistance.

CONCLUSION

This study demonstrated that patients with severe forms of DCM experienced significant improvement in neurological function following cervical decompression surgery. These improvements indicate that cervical decompression surgery is effective in this patient population and has the potential to improve neurological status.Level of Evidence: 3.

A New Framework for Investigating the Biological Basis of Degenerative Cervical Myelopathy [AO Spine RECODE-DCM Research Priority Number 5]: Mechanical Stress, Vulnerability and Time

STUDY DESIGN

Literature Review (Narrative).

OBJECTIVE

To propose a new framework, to support the investigation and understanding of the pathobiology of DCM, AO Spine RECODE-DCM research priority number 5.

METHODS

Degenerative cervical myelopathy is a common and disabling spinal cord disorder. In this perspective, we review key knowledge gaps between the clinical phenotype and our biological models. We then propose a reappraisal of the key driving forces behind DCM and an individual's susceptibility, including the proposal of a new framework.

RESULTS

Present pathobiological and mechanistic knowledge does not adequately explain the disease phenotype; why only a subset of patients with visualized cord compression show clinical myelopathy, and the amount of cord compression only weakly correlates with disability. We propose that DCM is better represented as a function of several interacting mechanical forces, such as shear, tension and compression, alongside an individual's vulnerability to spinal cord injury, influenced by factors such as age, genetics, their cardiovascular, gastrointestinal and nervous system status, and time.

CONCLUSION

Understanding the disease pathobiology is a fundamental research priority. We believe a framework of mechanical stress, vulnerability, and time may better represent the disease as a whole. Whilst this remains theoretical, we hope that at the very least it will inspire new avenues of research that better encapsulate the full spectrum of disease.

The value of cervical MRI in surgical lumbar canal stenosis patients

Background

The prevalence of cervical canal stenosis alone is estimated to be present in 4.9% of the adult population. Co-existence of dual pathology may complicate clinical presentation and necessitates a wise and individually based decision process.

Objectives

To estimate the co-existence of cervical canal stenosis in surgical lumbar canal stenosis patients and its reflection on decision-making regarding surgery.

Methods

It is a prospective study that was conducted on 70 cases with symptomatic lumbar canal stenosis by investigating them for cervical canal stenosis clinically and radiologically.

Results

The co-existence of cervical and lumbar canal stenoses was seen in 62 cases (88.57%); cases with relative cervical stenosis were 25 (35.714%) and absolute cervical stenosis was 37 (52.857%). Cases with no cervical stenosis were 8 (11.428%) and cases with relative lumbar stenosis were 22 (31.428%), while cases with absolute lumbar stenosis were 48 (68.571%). Cases with symptomatic cervical canal stenosis were 30 (42.857%). Cases with asymptomtic cervical canal stenosis were 32 (45.71%).

Conclusion

Tandem spinal stenosis (TSS) is not uncommon and MRI cervical spine should be done for every lumbar canal stenosis patient especially if indicated by history or clinical examination.

Should asymptomatic cervical stenosis be treated in the setting of progressive thoracic myelopathy? A systematic review of the literature

PURPOSE

Unlike tandem stenosis of the cervical and lumbar spine, tandem cervical and thoracic stenosis (TCTS) of the spine is less common, and the approach and order of intervention are controversial. We aim to review the literature to evaluate the incidence and interventions for patients with cervical and thoracic stenosis. We provide illustrative cases to demonstrate that thoracic myelopathy in the setting of asymptomatic cervical stenosis can be treated safely.

METHODS

A systematic review of the literature through electronic databases of PubMed, EMBASE, Web of Science, and Cochrane Library was performed to present the current literature that evaluates TCTS as it relates to incidence and surgical interventions. We also present two cases of patients undergoing operative intervention for thoracic myelopathy in the setting of concurrent cervical stenosis.

RESULTS

A total of 26 English original studies and case reports were identified. Nine studies evaluated the incidence of TCTS. 20 studies with a total of 168 patients with TCTS presented information on surgical intervention options. There is an overall aggregate incidence of 11.6% (530/4751) based on incidence studies. 165 patients underwent thoracic intervention. Of these patients, 63 patients underwent cervical intervention first, 29 underwent thoracic intervention first, and 73 underwent simultaneous, single-stage intervention.

CONCLUSIONS

In patients presenting with myelopathy, both cervical and thoracic spine should be evaluated for TCTS. Order of operative intervention is tailored to clinical and radiographic information. In cases of thoracic myelopathy with asymptomatic cervical stenosis, thoracic intervention can be pursued with precautions to prevent further cervical cord injury.

Imaging-Based Diagnosis of Epiconus Syndrome From the Distance of the Lesion to Where the Spinal Cord Terminates Not From the Disc Level: A Case Series

Objective This study aimed to analyze the neurological symptoms caused by thoracolumbar lesions according to their distance from where the spinal cord terminates for a better description of epiconus syndrome. Methods We retrospectively reviewed cases of patients with neurological symptoms caused by a thoracolumbar lesion in a single institute. Neurological symptoms were analyzed according to the distance from the proximal end of the lesion to where the spinal cord terminates using MRI or CT myelograms. The symptoms were classified into epiconus syndrome, thoracic myelopathy, and conus medullaris syndrome. The distance was described regarding the length of a vertebral body (VB). Results We included 19 patients in this series. The spinal cord terminates were at the lower third of the L1 vertebra most frequently (32%) in the range of T12 to L2 vertebra. The border between thoracic myelopathy and epiconus syndrome was 2VB proximal from where the spinal cord terminates, and that between epiconus syndrome and conus medullaris syndrome was 1VB. Mean disease duration until symptoms changed was 2.4 months in epiconus syndrome, while it was 25 months in thoracic myelopathy, and 10.3 months in conus medullaris syndrome. Conclusion Epiconus syndrome is caused by lesion 1-2VB proximal to where the spinal cord terminates. This study may provide further helpful information for clinical practice in the treatment of epiconus syndrome.

Extent and characteristic of relationships in canal dimension and canal body ratio between cervical and lumbar spine

A known prevalence of concurrent cervical and lumbar spinal stenosis was shown to be 5–25%, but there is a lack of evidence regarding direct relationships in canal dimension and canal-body ratio between cervical and lumbar spine. Total 247 patients (mean age: 61 years, male: 135) with cervical and lumbar computed tomography scans were retrospectively reviewed. Midsagittal vertebral body and canal diameters in reconstructed images were measured at all cervical and lumbar vertebrae, and canal-body ratios were calculated. The canal diameter and ratio were also compared according to the gender and age, and correlation analysis was performed for each value. There were significant correlations between cervical (C3–C7) and lumbar (L1–L5) canal dimension (p < 0.001). C5 canal diameter was most significantly correlated with L4 canal diameter (r = 0.435, p < 0.001). Cervical canal-body ratios (C3–C7) were also correlated with those of lumbar spine (L1–L5) (p < 0.001). The canal-body ratio of C3 was most highly correlated with L3 (r = 0.477, p < 0.001). Meanwhile, mean canal-body ratios of C3 and L3 were significantly smaller in male patients than female (p = 0.038 and p < 0.001) and patient’s age was inversely correlated with C5 canal diameter (r = − 0.223, p < 0.001) and C3 canal-body ratio (r = − 0.224, p < 0.001). Spinal canal dimension and canal-body ratio have moderate degrees of correlations between cervical and lumbar spine and the elderly male patients show the tendency of small canal diameter and canal-body ratio. This relationship of cervical and lumbar spine can be an important evidence to explain to the patients.

Whole-Spine Magnetic Resonance Imaging: A Review of Suggested Indications

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The spinal column has a propensity for lesions to manifest in a multifocal manner, and identification of the lesions can be difficult.

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When used to image the spine, magnetic resonance imaging (MRI) most accurately identifies the presence and location of lesions, guiding the treatment plan and preventing potentially devastating complications that are known to be associated with unidentified lesions.

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Certain conditions clearly warrant evaluation with whole-spine MRI, whereas the use of whole-spine MRI with other conditions is more controversial.

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We suggest whole-spine MRI when evaluating and treating any spinal infection, lumbar stenosis with upper motor neuron signs, ankylosing disorders of the spine with concern for fracture, congenital scoliosis undergoing surgical correction, and metastatic spinal tumors.

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Use of whole-spine MRI in patients with idiopathic scoliosis and acute spinal trauma remains controversial.

Prevalence and Predictive Factors of Asymptomatic Spondylotic Cervical Spinal Stenosis in Patients with Symptomatic Lumbar Spinal Stenosis

OBJECTIVE

We performed a retrospective cohort study to investigate the prevalence of and risk factors for asymptomatic spondylotic cervical spinal stenosis (ASCSS) in the setting of lumbar spinal stenosis (LSS).

METHODS

A total of 114 patients with a diagnosis of LSS without cervical myelopathy and radiculopathy were grouped into ASCSS and non-ASCSS groups. The medical data and radiological parameters, including age, sex, body mass index, Charlson comorbidity index, symptom duration, redundant nerve roots, dural sac cross-sectional area (DCSA), facet joint angle, lumbar lordosis angle (LLA), pelvic incidence (PI), Torg-Pavlov ratio, and lumbosacral transitional vertebrae, were analyzed. The lumbar stenosis index and cervical stenosis index of the 114 patients were also analyzed.

RESULTS

ASCSS occurred in 70 of the 114 patients with LSS (61.4%). The two groups showed significant differences in symptom duration, redundant nerve roots, LLA, DCSA, and PI. On multivariate logistic regression analysis, an LLA >35.85° (P < 0.001) and a DCSA <84.50 mm² (P = 0.003) were independently associated with ASCSS. The multi-index receiver operating characteristic curve showed that the area under the curve for predicted probability was 0.805 (P < 0.001). Linear regression analysis revealed that cervical stenosis index significantly and positively correlated with the lumbar stenosis index (r = 0.430; P < 0.001).

CONCLUSIONS

Our findings suggest that an LLA >35.85° and a DCSA <84.50 mm² are risk factors for the development of ASCSS. For LSS patients with an enlarged LLA and reduced DSCA, a whole spinal magnetic resonance imaging examination should be performed.

Advances in tissue state recognition in spinal surgery: a review

Spinal disease is an important cause of cervical discomfort, low back pain, radiating pain in the limbs, and neurogenic intermittent claudication, and its incidence is increasing annually. From the etiological viewpoint, these symptoms are directly caused by the compression of the spinal cord, nerve roots, and blood vessels and are most effectively treated with surgery. Spinal surgeries are primarily performed using two different techniques: spinal canal decompression and internal fixation. In the past, tactile sensation was the primary method used by surgeons to understand the state of the tissue within the operating area. However, this method has several disadvantages because of its subjectivity. Therefore, it has become the focus of spinal surgery research so as to strengthen the objectivity of tissue state recognition, improve the accuracy of safe area location, and avoid surgical injury to tissues. Aside from traditional imaging methods, surgical sensing techniques based on force, bioelectrical impedance, and other methods have been gradually developed and tested in the clinical setting. This article reviews the progress of different tissue state recognition methods in spinal surgery and summarizes their advantages and disadvantages.

Simultaneous or staged operation for tandem spinal stenosis: surgical strategy and efficacy comparison

Background

Tandem spinal stenosis (TSS) has a complex clinical presentation, and there is no consensus on the optimal surgical strategy. This study retrospectively compared the efficacy of different staged operations and simultaneous decompression for patients with TSS.

Methods

We reviewed data from 132 patients with TSS who received surgical procedures from January 2011 to June 2018. Patients were classified into three groups according to the most symptomatic area of compression (group C: first-stage surgery for cervical compression; group L: first-stage surgery for lumbar compression; group CL: simultaneous surgery for both). Medical records were reviewed for age, gender, comorbidities, operation time, combined estimated blood loss, and time of hospitalization. The JOA-C, JOA-L, NDI, and ODI scores, and complications were also examined.

Results

Postoperative outcomes were followed for 32.1 ± 5.4 months. There were significant differences in the re-operation rate and the interval time between the two types of staged operations (p = 0.005 and p = 0.001, respectively). There were no significant differences in gender (p = 0.639), operation time (p = 0.138), combined estimated blood loss (p = 0.116), or complications (p = 0.652) among the three groups, while the simultaneous group was significantly younger (p = 0.027), with fewer comorbidities (p < 0.001) and a shorter hospitalization time (p < 0.001). At the final follow-up, the JOA-C and JOA-L scores were increased, while the NDI and ODI scores were decreased, compared with the preoperative scores.

Conclusions

TSS can be effectively managed by either simultaneous or staged decompressions. First-stage surgery for cervical stenosis significantly lowers the requirement for second-stage lumbar surgery. One-stage simultaneous decompression is safe and effective with the advantage of reduce hospitalization time, without an increase in operative time or bleeding. However, the surgical indications should be strictly controlled and is recommended for younger patients with fewer comorbidities.

Minimally invasive tubular laminectomies in multilevel spine surgery-an illustrative case-based review of techniques and combined approaches

Minimally invasive techniques have become part of the spine surgeons' armamentarium and are currently utilized to treat many conditions involving the cervical, thoracic, lumbar and sacral spine. Surgical treatment of severe degenerative conditions such as multilevel spinal stenosis, tandem stenosis, combination of stenosis or disk herniation and spondylolisthesis at adjacent spinal levels, as well as extensive infections or hematomas, may require a multilevel tailored approach with all the challenges that such surgical planning entails. Although the use of minimally invasive tubular decompressive procedures has gained widespread popularity in the recent years, the adoption of such techniques during multilevel spine surgery can be at times challenging. A careful tailored selection of the surgical approach that better fits needs and expectations of the patient is therefore consequential to achieve good clinical and radiological outcome without compromising efficiency and results. Many surgical techniques have been described in literature but very few reports on the use of combined tubular approached are currently present. We therefore present an illustrative review of techniques for tubular laminectomies and combined approaches that can be utilized in the surgical treatment of multilevel spinal conditions. Illustrative cases documenting common and less common indications for the use of minimally invasive laminectomies are also presented.

Clinical Comparison of Selective versus Nonselective Decompression for Symptomatic Tandem Stenosis of the Cervical and Thoracic Spine: A Retrospective Cohort Study

OBJECTIVE

The aim of the present paper was to reveal the clinical differences between selective and nonselective decompression for symptomatic tandem stenosis of the cervical and thoracic spine (TSCTS).

METHODS

A total of 34 patients were eligible and included in the study. Among them, 8 patients underwent selective cervical decompression (CD), 15 patients underwent selective thoracic decompression (TD), and 11 patients underwent combined CD and TD (CTD) surgery. Age, sex, operative time, intraoperative blood loss, postoperative hospital stay, inpatient expenditure, preoperative upper Japanese Orthopaedic Association (JOA) rate, canal occupation rate, high-intensity T2-weighted image (T2WI) of the spinal cord, and preoperative and postoperative JOA scores were compared among the three groups.

RESULTS

The CD group had shorter operative time (138.8 ± 36.1 vs 229.7 ± 95.8 vs 328.6 ± 94.8, min, P < 0.001), less intraoperative blood loss (141.3 ± 116.7 vs 496.7 ± 361.8 vs 654.6 ± 320.5, mL, P = 0.004), and shorter postoperative hospital stay (4.6 ± 1.6 vs 9.0 ± 3.5 vs 10.3 ± 6.6, days, P = 0.008), as well as lower preoperative upper JOA rate (34.1 ± 5.6 vs 53.9 ± 8.4 vs 48.2 ± 15.2, %, P = 0.001) than the TD and CTD groups. The CTD group had higher inpatient expenditure than the CD and TD groups (87,850 ± 18,379 vs 55,100 ± 12,890 vs 55,772 ± 15,715, CNY, P < 0.001). The cervical canal occupation rates were similar among different groups (P > 0.05); however, the TD group showed a higher thoracic canal occupation rate than the CD group (58.3 ± 14.7 vs 43.3 ± 12.3, %, P = 0.035). All positive levels in high-intensity T2WI of the spinal cord were decompressed. The preoperative JOA scores as well as the postoperative JOA scores at 6 months and at last follow-up were comparable among the three groups (P > 0.05). Similarly, the JOA recovery rate showed no significant difference among the groups (P > 0.05).

CONCLUSION

Selective CD or TD alone demonstrated similar clinical effectiveness to nonselective and combined CTD for TSCTS. Individualized surgical decision should be made after meticulous assessments of clinical and radiological manifestations, general patient condition, and socioeconomic factors.

Coexisting Spine Lesions on Whole Spine T2 Sagittal MRI in Evaluating Spinal Degenerative Disease

BACKGROUND

Studies have reported on the usefulness of whole spine magnetic resonance imaging (MRI) in evaluating specific diseases such as spinal tuberculosis, spinal trauma, spondyloarthropathies, and multiple myeloma. In studies concerning degenerative spinal disease, sample sizes were small and some did not provide information on how symptomatic coexisting lesions were treated. We evaluated the types and prevalence of coexisting spine lesions found on whole spine T2 sagittal screening performed at the time of routine cervical and lumbar spine MRI and evaluated the efficacy of such screening in degenerative diseases of the cervical and lumbar spine.

METHODS

We reviewed 1,757 and 2,266 consecutive cases where whole spine T2 sagittal screening had been performed with routine cervical and lumbar spine MRI, respectively, in patients with cervical and lumbar spinal degenerative diseases. Coexisting spine lesions were documented and statistical analysis was performed to investigate significant differences according to sex, age, and initial diagnosis. Electronic medical records were reviewed to determine whether additional interventions were necessary following such findings.

RESULTS

We reviewed 1,252 and 1,689 consecutive cases of routine cervical and lumbar spine MRI respectively, with whole spine T2 sagittal screening. Of the 1,252, 419 (33.5%) patients with cervical spinal degenerative disease had coexisting lesions in the thoracolumbar spine. Patients with ligament ossification disease of the cervical spine showed a higher prevalence of coexisting spine lesions. Sixty of the 419 (14.3%) patients with coexisting spine lesions warranted additional intervention or surgical treatment. Four hundred and eighty-one of 1,689 (28.5%) patients with lumbar degenerative disease had coexisting spine lesions in the cervicothoracic spine. Forty-eight of the 481 (10.0%) patients with coexisting spine lesions warranted additional intervention. In both patient groups, older patients showed a significantly higher prevalence of coexisting spine lesions than younger patients.

CONCLUSION

Considering the minimal extra time and cost in performing whole spine screening, its application to routine spine MRI can be considered in evaluating cervical and lumbar spinal degenerative diseases.

[Effectiveness of simultaneous and staged minimally invasive dorsal decompression-stabilization procedures in patients with lumbar spine degenerative diseases]

Minimally invasive procedures reduce the trauma of spine surgery. However, they are associated with high complexity of manipulations, long learning curve, need for expensive equipment for intraoperative navigation and significant irradiation. Various options for surgical approaches are being developed to reduce irradiation of medical staff and patients, surgery time and the number of drugs administered for general anesthesia. Simultaneous surgical interventions (SiSI) is one of these options.

OBJECTIVE

To compare the effectiveness of simultaneous and staged minimally invasive dorsal decompression-stabilization procedures in patients with lumbar spine degenerative diseases.

MATERIAL AND METHODS

A prospective study included 67 patients (41 men and 26 women) aged 48 (34; 56) years who underwent a single-level minimally invasive spinal root decompression and transforaminal interbody fusion via Wiltse posterior-lateral approach. Two study groups were distinguished: group I (simultaneous surgical interventions, SiSI) (n=29), in which guide spokes and transpedicular screws were installed simultaneously by two surgeons within one x-ray session from two sides; group II (staged surgical interventions, StSI) (n=38), in which staged transpedicular stabilization was performed (decompression side followed by contralateral side). Mean follow-up was 14 months in group I and 20 months in group II. We considered intraoperative fluoroscopy and irradiation dose, duration of surgery and anesthesia with calculation of doses of opioid drugs, blood loss, time of activation, hospital-stay and perioperative morbidity. Clinical outcomes were studied in long-term postoperative period.

RESULTS

Simultaneous approach ensured less time of intraoperative fluoroscopy (p=0.029) and irradiation dose (p=0.035), duration of surgery (p=0.01) and anesthesia (p=0.02), amount of opioid drugs during anesthesia (p=0.017). Blood loss, duration of activation and hospitals-stay were similar in both groups (p=0.35, p=0.12 and p=0.57, respectively). There was comparable improvement in VAS score of pain in the lumbar spine and lower extremities in both groups (p=0.63 and p=0.31, respectively). According to SF-36 questionnaire, there was no between-group difference in physical and psychological components (p=0.44 and p=0.72, respectively). There was significantly greater number of adverse effects of anesthesia in the StSI group (26.2% vs. 6.8%, p=0.003). At the same time, the number of surgical postoperative complications was similar in both groups (3.4% vs. 5.3%, p=0.62).

CONCLUSION

Simultaneous minimally invasive dorsal decompression-stabilization procedures have some significant advantages over staged approach regarding intraoperative parameters and adverse effects of anesthesia in patients with lumbar spine degenerative diseases. Nevertheless, there were similar clinical data and small incidence of surgical perioperative complications.

Surgical strategy for non-continuous thoracic spinal stenosis: one- or two-stage surgery?

PURPOSE

Non-continuous thoracic spinal stenosis (NTSS) is a rare disease, but it is a challenging clinical entity for spine surgeons. However, few studies have focused on its treatment. Therefore, the purpose of this study was to provide surgical treatment guidelines for it by comparing the clinical outcomes of different surgical approaches.

METHODS

Patients who underwent thoracic decompression surgery for two diseased segments with two incisions (normal segments ≥ 3) between January 2010 and December 2018 were included. Among these patients, nine were treated with posterior decompression (PD) and circumferential decompression (CD) procedures in one-stage surgery (group A), 14 with PD and CD procedures in two-stage surgery (group B), 36 patients with PD procedures in one-stage surgery and 15 with PD procedures in two-stage surgery (group D). Medical records, operative time, blood loss and complications were reviewed. Neurologic status was assessed by the modified Japanese Orthopaedic Association scale for thoracic myelopathy.

RESULTS

Groups A, B, C and D were followed for 54.11 ± 20.51 months, 49.36 ± 29.30 months, 49.94 ± 31.94 months and 39.93 ± 26.18 months, respectively. When comparing groups A and B, operative time, blood loss and length of stay in hospital were significantly less in group A. However, the average recovery rate in group B was significantly higher than that in group A. In regard to groups C and D, group C showed a significantly shorter length of stay in hospital and lower rate of post-operative neurological deterioration. At final follow-up, groups C and D showed similar average recovery rates.

CONCLUSION

Different surgical procedures are suitable for different types of NTSS. For patients with NTSS mainly caused by posterior compression, PD via laminectomy in one-stage with two incisions can achieve satisfying clinical outcomes. Staged surgery, including CD and PD procedures, is recommended for patients with NTSS mainly caused by anterior compression.

Primary cervical decompression surgery may improve lumbar symptoms in patients with tandem spinal stenosis

PURPOSE

Tandem spinal stenosis (TSS) refers to coexisting lumbar and cervical canal stenosis. Evidence regarding whether cervical decompression improves lumbar symptoms in TSS is insufficient. Therefore, we determined the effectiveness of cervical decompression surgery for patients with lumbar spinal stenosis (LSS) and cervical spinal stenosis.

METHODS

The records of 64 patients with TSS experiencing lumbar symptoms who underwent cervical decompression surgery between April 2013 and July 2017 at a single institution were retrospectively reviewed. We categorized patients into the Non-improved (n = 20), Relapsed (n = 30), and Maintained-improvement (n = 14) groups according to the presence or absence of improvement and relapse in lower limb symptoms in TSS following cervical decompression surgeries.

RESULTS

Of 64 patients, 44 (69%) showed improved lower limb or low back symptoms, with 14 (22%) patients maintaining improvement. The preoperative cervical myelopathy-Japanese Orthopedic Association score and the preoperative number of steps determined using the 10-s step test were significantly lower in the Non-improved group than in the Maintained-improvement group. Receiver operating characteristic curve of preoperative 10-s step test results revealed 12 steps as a predictor for maintained improvement.

CONCLUSION

The improvement of LSS symptoms following cervical decompression surgeries may be associated with the severity of cervical myelopathy as determined in clinical findings rather than in imaging findings. Patients with TSS having a 10-s step test result of < 12 steps were more likely to experience a relapse of lower limb symptoms following cervical decompression surgeries.

Effectiveness of Duloxetine for Postsurgical Chronic Neuropathic Disorders after Spine and Spinal Cord Surgery

Study Design

This is a retrospective observational study with an outpatient setting.

Purpose

This study aimed to describe the effects of duloxetine (DLX) administration for postsurgical chronic neuropathic disorders (both pain and numbness) following spinal surgery in patients without depression.

Overview of Literature

Although several reports indicated the potential of DLX to effectively treat postoperative symptoms as a perioperative intervention, there have been no reports of its positive effect on postsurgical chronic neuropathic disorders.

Methods

A total of 24 patients with postsurgical chronic pain and/or numbness Numeric Rating Scale (NRS) scores of ≥4 were enrolled. All patients underwent spine or spinal cord surgery at Keio University Hospital and received daily administration of DLX for more than 3 months. The mean postoperative period before the first administration of DLX was 35.5±57.0 months. DLX was administered for more than 3 months at a dose of 20, 40, or 60 mg/day, and the degree of pain and numbness was evaluated using the NRS before administration and 3 months after administration. Effectiveness was defined as more than a 2-point decrease in the NRS score following administration.

Results

In terms of the type of symptoms, 15 patients experienced only numbness, eight experienced both pain and numbness, and one experienced only pain. Of the 24 patients, 19 achieved effective relief with DLX. DLX was effective for all patients with postsurgical chronic pain (n=9), and it reduced postsurgical chronic numbness in 18 of 23 patients. No significant difference was observed in background spinal disorders. DLX was not effective for five patients who complained only of postsurgical chronic numbness.

Conclusions

This study reports the effectiveness of DLX for postsurgical chronic neuropathic disorders. Although DLX reduced postsurgical chronic pain (efficacy rate=100%) and numbness (78.3%) in certain patients, further investigation is needed to determine its optimal use.

The prevalence and clinical characteristics of thoracic spinal stenosis: a systematic review

PURPOSE

Thoracic spinal stenosis (TSS) is a rare disease secondary to multiple pathological changes that differ in prevalence and clinical characteristics. The epidemiological characteristics of these pathologies are largely unknown due to the limited case samples and regional differences. Therefore, a systematic review was conducted to elucidate the prevalence and clinical characteristics of TSS.

METHODS

Case series and case reports on the ossification of the posterior longitudinal ligaments (OPLL), ossification of the ligamentum flavum (OLF) and thoracic disk herniation (TDH) were screened from PubMed, Embase and Web of Science databases and systematically reviewed. Epidemiological, demographic and segmental distribution data were extracted and analyzed.

RESULTS

A total of 129 studies including 1935 subjects were selected, of which 361 (18.7%) were diagnosed with OPLL, 804 (41.5%) with OLF, 143 (7.4%) with OPLL + OLF and 627 (32.4%) with TDH. Most reports were from China, Japan and USA. Thoracic OPLL occurred mostly at the middle-thoracic spine (43.4%), while OLF predominately occurred at the lower-thoracic spine (63.1%). TDH was mainly localized in the middle (46.0%) and lower-thoracic (50.3%) spine. Thirty-two studies involving 524 patients described tandem spinal stenosis, of which 52.1% had accompanying cervical diseases and 35.9% lumbar diseases.

CONCLUSIONS

There are significant differences in the age, sex and segment distribution characteristics of different pathologies leading to TSS. Tandem spinal stenosis is not uncommon and should be considered when diagnosing TSS. Our findings provide new insights into the prevalence and clinical characteristics of TSS and can help reduce misdiagnosis.

Diagnosis, Management, and Clinical Outcomes of Tandem Thoracic and Lumbar Stenosis: A Systematic Literature Review and Case Series

BACKGROUND

A scarcity of data has been reported on tandem thoracic lumbar stenosis, which might be related to either the rarity or underdiagnosis of the condition. We have presented a systematic review of the clinical presentation, diagnosis, and treatment patterns for patients with symptomatic tandem thoracic and lumbar stenosis.

METHODS

A PubMed/MEDLINE search was performed to find reports of patients with symptomatic tandem thoracic and lumbar stenosis.

RESULTS

The review identified 10 studies with a total of 48 patients with tandem thoracic and lumbar stenosis. Most patients (n = 41; 85%) had had tandem stenosis diagnosed at the initial investigation, with 71% of the reports citing ossification of the ligamentum flavum as a contributing etiology. A few patients (n = 7; 15%) had had thoracic lesions diagnosed after neurologic deterioration that had occurred after lumbar surgery for previously suspected isolated lumbar stenosis. Surgical management varied from isolated thoracic decompression, staged decompression, and simultaneous decompression. Most patients (n = 41; 87%) showed improved neurologic status after surgery.

CONCLUSION

Ossification of the ligamentum flavum might play a key role in the pathogenesis of the condition. Most patients with tandem thoracic and lumbar stenosis will show improvement after surgical decompression. Although the limited evidence available has raised concerns regarding neurologic deterioration after initial lumbar decompression in patients with coexisting thoracic stenosis, the data are insufficient to definitively determine an optimal surgical strategy. Further research is needed to identify the optimal diagnostic and management criteria for patients with symptomatic tandem thoracic and lumbar stenosis.

EFFICACY OF THE CLINICAL-INSTRUMENTAL ALGORITHM IN THE TREATMENT OF SPINAL TANDEM STENOSIS

ABSTRACT Objective: To conduct a multicenter analysis of the effectiveness of surgical tactics for treating patients with symptomatic tandem stenosis of the cervical and lumbar spine, based on a differentiated clinical-instrumental algorithm. Methods: The study included 97 patients with symptomatic tandem stenosis of the cervical and lumbar spine. The patients were allocated into 2 groups. The main prospective follow-up group (Group I) consisted of patients (n=46) who had undergone staged decompression/stabilization surgery according to the surgical tactics developed based on the differential clinical-instrumental algorithm. The clinical comparison group (Group II) (n=51) consisted of retrospectively recruited patients who, depending on the prevailing clinical condition, underwent primary surgery at the cervical level (29 cases) or at the lumbar level (22 cases). Results: The comparative analysis in Group I revealed significantly better parameters in the clinical and instrumental data. The total rates of postoperative surgical complications in the cervical and lumbar spine were 15% in Group I and 68% in Group II (p=0.0014). Conclusion: The multicenter analysis of the clinical-instrumental algorithm based on differential application of decompression/stabilization techniques enabled more rational and radical surgery, with less adverse outcomes, leading to earlier start of rehabilitation in the prospective group of patients (Group I), and an objective improvement in long-term clinical and functional outcomes. Level of Evidence II; Prognostic Studies - Investigating the Effect of a Patient Characteristic on Disease Outcome.

Quality of life changes after lumbar decompression in patients with tandem spinal stenosis

OBJECTIVE

Tandem spinal stenosis (TSS) is a degenerative spinal condition characterized by spinal canal narrowing at 2 or more distinct spinal levels. It is an aging-related condition that is likely to increase as the population ages, but which remains poorly described in the literature. Here we sought to determine the impact of primary lumbar decompression on quality-of-life (QOL) outcomes in patients with symptomatic TSS.

PATIENTS AND METHODS

We retrospectively reviewed 803 patients with clinical and radiographic evidence of TSS treated between 2008 and 2014 with a minimum 2-year follow-up. The records of patients with clinical and radiographic evidence of concurrent cervical and lumbar stenosis were reviewed. Prospectively gathered QOL data, including the Pain Disability Questionnaire (PDQ), Patient Health Questionnaire-9 (PHQ-9), EuroQOL-5 Dimensions (EQ-5D), and Visual Analogue Scale (VAS) for low back pain, were assessed at the 6-month, 1-year, and 2-year follow-ups.

RESULTS

Of 803 identified patients (mean age 66.2 years; 46.9% male), 19.6% underwent lumbar decompression only, 14.1% underwent cervical + lumbar decompression, and 66.4% underwent conservative management only. Baseline VAS scores were similar across all groups, but patients undergoing conservative management had better baseline QOL scores on all other measures. Both surgical cohorts experienced significant improvements in the VAS, PDQ, and EQ-5D at all time points; patients in the cervical + lumbar cohort also had significant improvement in the PHQ-9. Conservatively managed patients showed no significant improvement in QOL scores at any follow-up interval.

CONCLUSION

Lumbar decompression with or without cervical decompression improves low back pain and QOL outcomes in patients with TSS. The decision to prioritize lumbar decompression is therefore unlikely to adversely affect long-term quality-of-life improvements.

The effect of multiple lesions in patients with ossification of the posterior longitudinal ligament of the cervical spine

PURPOSE

Ossification of the posterior longitudinal ligament of the cervical spine (cervical OPLL) is associated with the lesions at the thoracic and/or lumbar spine. Multiple spinal lesions cause additional neurological deficit, affecting the outcomes of cervical laminoplasty. This study aimed to clarify the effect of multiple lesions on the outcomes of cervical laminoplasty and to compare the results with data from patients without them.

METHODS

From April 1981 to October 2015, 201 patients underwent laminoplasty for cervical OPLL; however, 167 patients were followed for >2 years. Twenty-four patients underwent additional surgery for multiple lesions due to spinal stenosis. The pathologies of the lesions were assessed. The patients were divided into two groups: the thoracic and thoraco-lumbar group (T-group: 8 patients) and the lumbar group (L-group: 16 patients). One-hundred patients without an additional surgery served as the control group. The maximum Japanese Orthopaedic Association (JOA) score and the most recent score for recovery was compared between the multiple and control groups.

RESULTS

The maximum score and recovery rate and the score and recovery rate at the last follow-up in the multiple group were lower than those in the control group. There was no significant difference in the postoperative JOA score and recovery rate between the T-group and the L-group.

CONCLUSIONS

Neurological recovery in patients with multiple lesions was poorer than in those without lesions. Therefore, special attention should be paid to cervical OPLL with multiple spinal lesions.

Lower Urinary Tract Symptoms and Urinary Bother Are Common in Patients Undergoing Elective Cervical Spine Surgery

BACKGROUND

Lower urinary tract symptoms (LUTS) and urinary bother have been reported in adults undergoing surgery and have been associated with urinary tract infections, longer hospital stays, increased surgical costs, and decreased patient satisfaction. Previous reports indicate that up to one in two patients with lumbar spine pathology have moderate-to-severe LUTS, but little is known about LUTS in patients with cervical spine conditions.

QUESTIONS/PURPOSES

(1) What is the prevalence of moderate-to-severe LUTS and clinically relevant urinary bother among patients undergoing elective cervical spine surgery? (2) Does the presence of myelopathy affect frequency of moderate-to-severe LUTS or clinically relevant urinary bother among patients undergoing elective cervical spine surgery? (3) Do MRI findings of spinal cord injury or compression correlate with presence and severity of LUTS?

METHODS

We performed a cross-sectional study using clinical data collected from adult patients undergoing elective cervical spine surgery. Over an approximately 30-month period, we approached all patients who were evaluated in the preoperative clinic before undergoing elective cervical spine surgery. Of the 257 approached, 242 participated (94%). Study participants ranged in age from 34 to 83 years with a mean age of 58 years (SD 12). There were 108 males (45%) and 134 females (55%). A validated questionnaire, the International Prostate Symptom Score (IPSS), was used to identify LUTS. The IPSS score ranges from 0 to 35 points with LUTS presence defined as a score of ≥ 8 and LUTS severity categorized as mild (IPSS 0-7), moderate (IPSS 8-19), or severe (IPSS 20-35). Quality of life resulting from urinary bother is scored 0 to 6 with scores ≥ 4 considered clinically relevant urinary bother. Patients were grouped into a myelopathy group and a nonmyelopathy group based on diagnosis as assigned by the operating surgeon. MRIs were analyzed by one spine surgeon to identify the presence of cord signal, number of levels with cord compression (mm), and a calculated compression ratio score with cord compression and with compression ratio among patients with myelopathy.

RESULTS

The prevalence of moderate LUTS in our patient sample was 40% (97 of 242; 95% confidence interval [CI], 34%-47%). The prevalence of severe LUTS in our patient sample was 8% (19 of 242; 95% CI, 5%-12%). Clinically relevant urinary bother was reported in 18% of patients (41 of 228; 95% CI, 13%-24%). After adjustment for age and sex, the odds of moderate-to-severe LUTS among patients with myelopathy was greater than that observed in patients without myelopathy (adjusted odds ratio, 2.0; p = 0.015). The prevalence of clinically relevant urinary bother was higher in patients with myelopathy (30% [26 of 88]) compared with those with no myelopathy (11% [15 of 140]; p < 0.001). With the numbers available, among patients with myelopathy, there was no difference in distribution of LUTS symptom severity or IPSS score according to cord signal presence (50% [23 of 46]) and absence (65% [31 of 48]; p = 0.153), number of levels with compression (70% [seven of 10 with four levels]; 59% [13 of 22 with three levels]; 51% [19 of 37] with two levels; and 60% [15 of 25] with one level; p = 0.730), millimeters of cord compression (r = 0.02; p = 0.854), or compression ratio (r = 0.09; p = 0.413).

CONCLUSIONS

Nearly half of all patients undergoing elective cervical spine surgery had moderate-to-severe LUTS. This is more than double the prevalence that has been reported in a community-dwelling adult population. These symptoms can impair quality of life, lead to surgical complications (urinary retention or incontinence), and may be mistaken for cauda equina, prompting potentially unnecessary imaging and studies. Given that urinary bother is reported less frequently than LUTS, patients may be less likely to seek care for urinary symptoms before undergoing surgery. Therefore, it is important to increase provider awareness of the high prevalence of LUTS.

LEVEL OF EVIDENCE

Level III, prognostic study.