Rotator cuff repair vs. nonoperative treatment: a systematic review with meta-analysis

[Rotator cuff lesion-Is cuff repair indicated in patients with rheumatic diseases?]

Rheumatic diseases, particularly in the context of rheumatoid arthritis (RA), frequently affect the shoulder joint and lead to lesions of the rotator cuffs, which are associated with chronic pain and restricted movement. Systemic inflammation endangers the integrity of the rotator cuff, while pharmacotherapy can impair tissue repair; however, the function of rotator cuffs is decisive for the selection of diagnostic and therapeutic measures. In cases of failure of conservative treatment surgical reconstruction represents an option in order to relieve pain and restore the biomechanical function. However, the decision for surgical treatment in RA patients is complex due to increased risks of complications, such as delayed healing, infections and re-rupture. This article examines the benefits and probability of success of the surgical reconstruction of rotator cuffs in the context of rheumatic diseases and should form a foundation for making clinical decisions and treatment recommendations.

Clinical Outcomes of Arthroscopic Treatment of High-grade Partial Thickness Rotator Cuff Tears with Augmentation using Bioinductive Collagen Implants Are Comparable to Tear Completion and Repair

PURPOSE

To evaluate and compare the functional outcomes and reoperation rates following bio-inductive collagen implant repair (BCIR) vs arthroscopic tear completion and rotator cuff repair (ARCR) for the management of partial rotator cuff tears at a minimum of 1 years follow-up.

METHODS

A retrospective review was carried out to identify patients ≥30 years old who underwent BCIR or ARCR for grade 3 partial thickness supraspinatus tears with ≥12 months follow up. Clinical outcomes assessed included range of motion, visual analogue score (VAS), American Shoulder Elbow Score (ASES) & Single Answer Numerical Evaluation (SANE) scores as well as clinical failure requiring revision surgery. A p-value of < 0.05 was considered to be statistically significant. The minimally important clinical difference (MCID) was calculated.

RESULTS

Participants included 48 patients who underwent BCIR and 37 who underwent ARCR, with a mean follow-up 27.3 ± 11.8 months, there were no significant baseline differences in demographics or tear characteristics between the cohorts. The mean surgical duration was shorter in the BCIR cohort (53 ± 10 vs 65 ± 17 minutes, p = 0.001). At final follow up there was no difference in ASES (p= .143), SANE (p = .167), VAS scores (p = .130), range of flexion (p = .159), abduction (p = .379) or external rotation (p = .281). Both groups obtained significant postoperative improvements (p < .02, for all). There was no difference in the achievement of the MCID for VAS (p = .999), SANE (p = .435) or ASES score (0.377). There was no significant difference in the rate of revision repair at final follow up 2.1% vs 5.4% (p = .577).

CONCLUSION

BCIR of high grade partial thickness rotator cuff tears results in reliable improvements in pain, shoulder function and range of motion equivalent to traditional suture anchor repair. There was no difference in the rate of MCID achievement or revision surgery.

STUDY DESIGN

Level III, retrospective comparative series.

Cross-cultural adaptation, reliability, and validity of the Italian version of the Western Ontario Rotator Cuff (WORC) Index in subjects with rotator cuff diseases

PURPOSE

The Western Ontario Rotator Cuff (WORC) Index is a disease-specific, recommended tool to investigate the quality of life in subjects with rotator cuff (RC) disorders and tears. The purpose of this study was to deeply assess the psychometric properties of the WORC Index in patients with RC disorders and repair.

METHODS

The WORC Index was translated and cross-culturally adapted into Italian according to international guidelines and administered to 149 subjects with RC disorders or repair. Subjects completed the WORC Index, the American Shoulder and Elbow Surgeon Standardized Shoulder Assessment Form (ASES), the Short-Form Health Survey 36 (SF-36), and the Numerical Pain Rating Scale (NPRS). Confirmatory Factor Analysis (CFA) was run to investigate the structural validity. Internal consistency (Cronbach's alpha), test-retest reliability (Intraclass Correlation coefficient [ICC]), measurement error (Standard Error of Measurement [SEM], Minimum Detectable Change [MDC95]), and construct validity (a-priori hypothesis testing with the correlation with the other outcome measures) were also assessed.

RESULTS

After addressing local item dependency, the final CFA confirmed a five-subscale structure (RMSEA = 0.059; SRMSR = 0.04; CFI = 0.969; TLI = 0.958). Cronbach's alpha ranged from 0.843 to 0.933. The test-retest reliability was excellent (ICC ranged from 0.873 to 0.929). SEM ranged from 6.1 to 9.9 points, and MCD95 varied from 17 to 27.4 points. Construct validity was considered satisfactory for all subscales.

CONCLUSION

The Italian version of the WORC Index demonstrated validity and reliability in assessing subjects with RC disorders and repair. It is recommended for use in clinical practice and research.

Bioprinted Hydrogels as Vehicles for the Application of Extracellular Vesicles in Regenerative Medicine

Three-dimensional bioprinting is a new advance in tissue engineering and regenerative medicine. Bioprinting allows manufacturing three-dimensional (3D) structures that mimic tissues or organs. The bioinks used are mainly made of natural or synthetic polymers that must be biocompatible, printable, and biodegradable. These bioinks may incorporate progenitor cells, favoring graft implantation and regeneration of injured tissues. However, the natures of biomaterials, bioprinting processes, a lack of vascularization, and immune responses are factors that limit the viability and functionality of implanted cells and the regeneration of damaged tissues. These limitations can be addressed by incorporating extracellular vesicles (EV) into bioinks. Indeed, EV from progenitor cells may have regenerative capacities, being similar to those of their source cells. Therefore, their combinations with biomaterials can be used in cell-free therapies. Likewise, they can complement the manufacture of bioinks by increasing the viability, differentiation, and regenerative ability of incorporated cells. Thus, the main objective of this review is to show how the use of 3D bioprinting technology can be used for the application of EV in regenerative medicine by incorporating these nanovesicles into hydrogels used as bioinks. To this end, the latest advances derived from in vitro and in vivo studies have been described. Together, these studies show the high therapeutic potential of this strategy in regenerative medicine.

The effects of preoperative glenohumeral osteoarthritis on rotator cuff repair: A systematic review and meta-analysis

PURPOSE

This meta-analysis was carried out to evaluate the clinical effectiveness of rotator cuff repair surgery in treating rotator cuff tears in individuals with mild glenohumeral osteoarthritis (GHOA).

METHODS

A computer-based search was conducted across multiple databases including PubMed, Embase, Web of Science, and Cochrane Library using the keywords "Shoulder Joints", "Osteoarthrosis", and "rotator cuff". Only studies focusing on patients with GHOA who underwent rotator cuff repair were considered for inclusion. The pertinent data was extracted and assessed for heterogeneity.

RESULTS

A total of 5 studies involving 924 patients were included in the meta-analysis. The treatment outcomes of patients with rotator cuff tears accompanied by mild GHOA and those with simple rotator cuff tears after rotator cuff repair were comparable in terms of retear(OR: 1.24; 95% CI 0.82-1.89; P = 0.31). The postoperative functional scores: the VAS score (MD: 0.14; 95% CI -0.19-0.47; P = 0.41)、ASES score (MD: -0.33; 95% CI -1.64-0.99)were similar between the two groups. Subgroup analysis of rotator cuff tears(small to moderate, MD: 0.85; 95%CI -0.65-2.39; p = 0.28; large to massive, MD: -1.94; 95% CI -8.45-4.58; P = 0.56), showed no difference in postoperative ASES scores between the two groups. Constant score (MD:-3.20; 95% CI -6.33-0.08; P = 0.04), external rotation (ER) in Range of motion (ROM) (MD: -4.42; 95% CI -6.72-2.13; P = 0.0002) and forward flexion (FF) in ROM(MD: -4.22; 95% CI -8.28-0.15; P = 0.04) were superior in patients with simple rotator cuff tears compared to those with rotator cuff tears accompanied by GHOA.

CONCLUSION

Patients with rotator cuff tears and mild GHOA can achieve shoulder joint restoration after shoulder cuff repair surgery, and there is only a certain difference in postoperative Constant Score and ROM between these two groups.

TRIAL REGISTRATION

PROSPERO registration CRD42024565212.

Comparing Conventional Double-Row With Transosseous Equivalent Suture Bridge Fixation in Arthroscopic Rotator Cuff Repairs: A Multicenter Retrospective Cohort Study

Background

Biomechanical studies have shown that the transosseous equivalent suture bridge (TOE-SB) rotator cuff repair technique improves contact areas and pressure between the tendon and footprint, which may facilitate healing. However, few studies have directly compared its outcomes with traditional double-row (DR) repair.

Purpose/Hypothesis

The primary objectives of this study were to (1) compare the functional outcomes of DR with TOE-SB fixation in patients undergoing arthroscopic rotator cuff repairs and (2) compare healing rates between the 2 groups and investigate whether any factors were associated with healing. It was hypothesized that arthroscopic rotator cuff repair using DR repair would demonstrate no difference in disease-specific quality of life, patient-reported outcomes, or healing rates compared with TOE-SB repair.

Study Design

Cohort study; Level of evidence, 3.

Methods

This was a cohort study conducted as a subanalysis of 2 larger randomized controlled trials. Patients ≥18 years old with degenerative rotator cuff tears confirmed by magnetic resonance imaging who had persistent symptoms of pain and functional impairment after 6 months of nonoperative management were enrolled in prospective randomized controlled trials and underwent either a traditional DR repair or a TOE-SB rotator cuff repair. Functional outcomes were assessed using the Western Ontario Rotator Cuff index, the American Shoulder and Elbow Surgeons score, and the Constant score at baseline and 3, 6, 12, and 24 months postoperatively. Healing rates were determined using ultrasound at 24 months postoperatively.

Results

A total of 184 patients were included in this study; 34 patients underwent conventional DR repair and 150 underwent TOE-SB repair. Postoperative changes in the outcome measures from baseline were statistically significant for all outcomes in both groups (P < .0001). No statistically significant differences were found between outcomes at any of the follow-up times, except a significant difference in the Constant score at 24 months in favor of the DR group (mean ± SE, 80.5 ± 1.1 [95% CI, 78.4-82.7]) and TOE-SB and DR, respectively (mean ± SE, 85.7 ± 2.2 [95% CI, 81.2-90.1]) (P = .041). Healing rates were 77.8% for DR and 83% for TOE-SB (odds ratio, 1.34 [95% CI, 0.53-3.38]; P = .53). Multivariable regression analysis showed a positive correlation between nonhealing rates and the rotator cuff tear size in the sagittal plane (odds ratio, 1.97 (95% CI, 1.02-3.78); P = .042).

Conclusion

No difference was found between DR and TOE-SB rotator cuff repair in the Western Ontario Rotator Cuff index, the American Shoulder and Elbow Surgeons score, Constant strength subscore, or the healing rate. The Constant score at the 24-month follow-up favored DR repair but did not reach the minimal clinically important difference. An association was found between higher healing rates and smaller sagittal plane tear sizes.

Factors associated with subjective shoulder function preoperatively and postoperatively after arthroscopic rotator cuff repair

Background

Understanding factors associated with improvements in subjective shoulder function after arthroscopic rotator cuff repair (ARCR) helps clinicians identify targets for postoperative rehabilitation. The aim of this study was to investigate the factors associated with subjective shoulder function after ARCR.

Methods

Patients who underwent ARCR for rotator cuff tear with at least 12 months of follow-up were included. Subjective shoulder function was assessed preoperatively and at 6 and 12 months postoperatively, using the Shoulder36 (Sh36) 5 domain scores (pain, range of motion [ROM], strength, activities of daily living, and general health). Stepwise multivariable regression analysis was performed to extract the relevant factors for each Sh36 domain score using active shoulder ROM, isometric shoulder and elbow strength, pain score, demographic data, intraoperative findings, medical complications, and cuff integrity.

Results

A total of 104 patients met the inclusion criteria for this study. Multivariable regression analysis identified active abduction ROM as the factor associated with 5 Sh36 domain scores at preoperatively. At 6 months postoperatively, isometric external rotation strength at the body side or 90° abduction position, but not the ROM factor, was identified as a significant associated factor with 5 Sh36 domain scores. At 12 months postoperatively, pain score was the most associated factor with pain, ROM, strength, and activities of daily living domain scores of Sh36.

Conclusion

Factors associated with subjective shoulder function after ARCR differed between the preoperative and postoperative periods. Postoperative treatment, including rehabilitation, should be modified according to the postoperative period after ARCR.

Quantitative ultrasound assessment of fatty infiltration of the rotator cuff muscles using backscatter coefficient

BACKGROUND

To prospectively evaluate ultrasound backscatter coefficients (BSCs) of the supraspinatus and infraspinatus muscles and compare with Goutallier classification on magnetic resonance imaging (MRI).

METHODS

Fifty-six participants had shoulder MRI exams and ultrasound exams of the supraspinatus and infraspinatus muscles. Goutallier MRI grades were determined and BSCs were measured. Group means were compared and the strength of relationships between the measures were determined. Using binarized Goutallier groups (0-2 versus 3-4), areas under the receiver operating characteristic curves (AUROCs) were calculated. The nearest integer cutoff value was determined using Youden's index.

RESULTS

BSC values were significantly different among most Goutallier grades for the supraspinatus and infraspinatus muscles (both p < 0.001). Strong correlations were found between the BSC values and Goutallier grades for the supraspinatus (τb = 0.72, p < 0.001) and infraspinatus (τb = 0.79, p < 0.001) muscles. BSC showed excellent performance for classification of the binarized groups (0-2 versus 3-4) for both supraspinatus (AUROC = 0.98, p < 0.0001) and infraspinatus (AUROC = 0.98, p < 0.0001) muscles. Using a cutoff BSC value of -17 dB, sensitivity, specificity, and accuracy for severe fatty infiltration were 87.0%, 90.0%, and 87.5% for the supraspinatus muscle, and 93.6%, 87.5%, and 92.7% for the infraspinatus muscle.

CONCLUSION

BSC can be applied to the rotator cuff muscles for assessment of fatty infiltration. For both the supraspinatus and infraspinatus muscles, BSC values significantly increased with higher Goutallier grades and showed strong performance in distinguishing low versus high Goutallier grades.

RELEVANCE STATEMENT

Fatty infiltration of the rotator cuff muscles can be quantified using BSC values, which are higher with increasing Goutallier grades.

KEY POINTS

Ultrasound BSC measurements are reliable for the quantification of muscle fatty infiltration. BCS values increased with higher Goutallier MRI grades. BCS values demonstrated high performance for distinguishing muscle fatty infiltration groups.

Arthroscopic Repair of Rotator Cuff Tears in Older Adults: A Retrospective Case-Series Study

Introduction

Rotator cuff tears (RCTs) are a common source of pain in the shoulder girdle. There is still debate about the optimal treatment for older adults with RCTs. In clinical practice, patients who do not respond well to non-surgical management may still be eligible for operative treatment. In this study, we assessed the outcome of arthroscopic repair of RCTs in patients ≥60 years old.

Material and method

A retrospective case series was conducted to include patients who underwent arthroscopic repair of RCTs from 1 January 2018 to 1 January 2021. The study included individuals aged ≥60 years who had radiologically confirmed RCTs (verified by MRI) and clinical findings including sleep-disturbing pain and reduced range of motion. Preoperative treatment included physiotherapy for at least 6 months and one subacromial corticosteroid injection.

Results

Fifty-three RCTs were treated during the study period. After exclusion because of incomplete documentation, 45 patients remained. The mean age was 66 years and 80% had isolated supraspinatus tears and 25% had variable degrees of fatty infiltration (Goutallier grade 1-3) on MRI examination with positive tangent sign. There were no surgical site infections and three symptomatic re-ruptures (6%). At follow-up, (71%) reported no remaining sleep-disturbing shoulder pain. Abduction improved from 62° to 122°. Flexion improved from 68° to 135°. This study found that people aged 60 years and older who underwent repair of RCTs showed statistically significant clinical improvement in shoulder flexion and abduction with less sleep-disturbing shoulder pain. These encouraging results may contribute to the existing literature, favoring the choice of surgical treatment for symptomatic RCTs in this age group with failed nonoperative treatment.

Conclusion

The arthroscopic repair of RCTs in patients 60 years and older yielded a substantial increase in shoulder flexion and abduction, significantly reducing sleep-disturbing shoulder pain. Postoperative complications were minimal.

Rotator Cuff Repair by All-Arthroscopic Versus Mini-Open Technique: A Comparison of Clinical and Functional Outcome

BACKGROUND

Rotator cuff tears can lead to debilitating shoulder function and impairment. Rotator cuff repair aims to eliminate pain and improve function with increased shoulder strength and range of motion. This study evaluated the differences between all-arthroscopic (AA) and mini-open (MO) repair procedures for rotator cuff tendon tears regarding clinical and functional outcomes.

METHODS

This was a prospective study conducted at a tertiary care government Hospital in Kolkata, India, between March 2015 and September 2016 which evaluated 25 patients who had undergone all-arthroscopic surgery and 25 patients who underwent mini-open repair (total of 50 patients) for rotator cuff tear with a minimum one-year follow-up. The UCLA score was used to assess the functional outcome of these patients.

RESULTS

The mean age of all patients included in this study was 45.32 years. 86% of patients were male. The two groups had similar demographic characteristics, pre-operative baseline parameters, and intra-op findings. The average UCLA score showed significant improvement from 13.92 pre-operatively to 29.76 at the final follow-up. The patients in the all-arthroscopic surgery group experienced a notable decrease in pain within the first three months compared to the mini-open group. However, at the time of the final follow-up, no significant difference was noted between both groups when comparing the University of California at Los Angeles (UCLA) score, Visual Analogue Scale (VAS) score for pain, and active or passive glenohumeral motion.

CONCLUSION

The outcomes of all-arthroscopic and mini-open rotator cuff repair surgery are equivocal in terms of both clinical and functional results, with no significant difference in post-operative pain, shoulder joint strength range of motion, or patient satisfaction over the long term.

A threshold of lower preoperative mental health is associated with decreased achievement of comfort and capability benchmarks following rotator cuff repair: a retrospective cohort study

BACKGROUND

Preoperative biomedical patient characteristics are known to affect the time to achievement of clinically significant outcomes (CSOs) following arthroscopic rotator cuff repair (RCR). However, less is known about the association between preoperative mental status and the time to achievement of CSOs. We hypothesize that higher preoperative mental status is associated with faster achievement of CSOs following arthroscopic RCR.

METHODS

Patient-reported outcome measures (PROMs) were collected preoperatively and at postoperative intervals up to 2 years. PROMs included pain visual analog scale (VAS), American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), Single Assessment Numeric Evaluation (SANE), and Veterans RAND 12-Item Health Survey (VR-12) scores. Threshold values for CSOs were obtained from previous literature. Mean time to achievement of CSOs was calculated using a Kaplan-Meier analysis. A Cox proportional hazards regression analysis was performed to identify preoperative variables associated with earlier achievement of CSOs.

RESULTS

Sixty-nine patients with an average age of 59 ± 8 years were included. Patients with higher preoperative mental status, as measured by VR-12 mental component summary (MCS), experienced significantly earlier substantial pain improvement postoperatively (P = .0471). Patients with higher preoperative mental status also achieved CSOs for physical health at earlier time points (P = .0187). Preoperative VR-12 MCS scores ≥ 40 were associated with earlier achievement of CSOs for pain (P = .0005) and physical health (P = .0015). Ninety-eight percent of patients with preoperative MCS scores ≥40 achieved acceptable pain relief at 4.5 months vs. 56% of all other patients at 12.3 months (P = .0001). Patients with preoperative MCS scores ≥40 experienced significantly faster improvement in physical health compared to patients with preoperative MCS scores <40 (P = .0006).

CONCLUSIONS

Higher preoperative mental status, especially a preoperative MCS score ≥40, is associated with significantly faster improvement in pain and physical function following arthroscopic RCR. Nearly all patients (98%) with preoperative MCS score ≥40 achieved an acceptable state of pain relief compared with only 56% of patients with preoperative MCS score <40. These findings indicate that a holistic approach with equal consideration of preoperative mental health and rotator cuff pathophysiology is vital to the successful management of rotator cuff tendinopathy.

Passive shoulder abduction range of motion at 3 months postoperatively is the most important prognostic factor for achieving full recovery of range of motion at 6 months after arthroscopic rotator cuff repair

Background

After arthroscopic rotator cuff repair (ARCR), it is crucial for clinicians to predict the functional recovery in the early postoperative period for considering rehabilitation strategies. The aim of this study was to identify the prognostic factors in the early postoperative period for achieving full recovery of range of motion (ROM) at 6 months after ARCR.

Methods

This study included 184 patients who underwent ARCR. Patients were divided into the full recovery and nonrecovery groups using the Constant ROM score at 6 months postoperatively. The area under the curve for predicting the full recovery group was calculated for all independent variables such as demographic data, ROM, shoulder functional scores at preoperative and 3 months postoperative using receiver operating characteristic curve analysis. Multivariable logistic regression analysis was then performed using candidate variables with an area under the curve of 0.7 or greater to determine prognostic factors for full recovery at 6 months postoperatively. The same analysis as above was also performed by dividing the patients into groups according to their preoperative ROM.

Results

Multivariable logistic regression analysis revealed that preoperative active flexion, 3 months postoperative passive abduction, and internal rotation at 90° abduction ROM were significant prognostic factors of achieving full ROM recovery at 6 months postoperatively. Only passive abduction ROM at 3 months postoperatively was significantly extracted in the preoperative ROM limitation group.

Conclusion

This study demonstrated that passive abduction ROM at 3 months postoperatively was a significant prognostic factor of achieving full recovery of ROM at 6 months after ARCR.

3-Dimensional Bioprinting of a Tendon Stem Cell-Derived Exosomes Loaded Scaffold to Bridge the Unrepairable Massive Rotator Cuff Tear

BACKGROUND

Unrepairable massive rotator cuff tears (UMRCTs) are challenging to surgeons owing to the severely retracted rotator cuff musculotendinous tissues and extreme defects in the rotator cuff tendinous tissues.

PURPOSE

To fabricate a tendon stem cell-derived exosomes loaded scaffold (TSC-Exos-S) and investigate its effects on cellular bioactivity in vitro and repair in a rabbit UMRCT model in vivo.

STUDY DESIGN

Controlled laboratory study.

METHODS

TSC-Exos-S was fabricated by loading TSC-Exos and type 1 collagen (COL-I) into a 3-dimensional bioprinted and polycaprolactone (PCL)-based scaffold. The proliferation, migration, and tenogenic differentiation activities of rabbit bone marrow stem cells (BMSCs) were evaluated in vitro by culturing them in saline, PCL-based scaffold (S), COL-I loaded scaffold (COL-I-S), and TSC-Exos-S. In vivo studies were conducted on a rabbit UMRCT model, where bridging was repaired with S, COL-I-S, TSC-Exos-S, and autologous fascia lata (FL). Histological and biomechanical analyses were performed at 8 and 16 weeks postoperatively.

RESULTS

TSC-Exos-S exhibited reliable mechanical strength and subcutaneous degradation, which did not occur before tissue regeneration. TSC-Exos-S significantly promoted the proliferation, migration, and tenogenic differentiation of rabbit BMSCs in vitro. In vivo studies showed that UMRCT repaired with TSC-Exos-S exhibited significant signs of tendinous tissue regeneration at the bridging site with regard to specific collagen staining. Moreover, no significant differences were observed in the histological and biomechanical properties compared with those repaired with autologous FL.

CONCLUSION

TSC-Exos-S achieved tendinous tissue regeneration in UMRCT by providing mechanical support and promoting the trend toward tenogenic differentiation.

CLINICAL RELEVANCE

The present study proposes a potential strategy for repairing UMRCT with severely retracted musculotendinous tissues and large tendinous tissue defects.

Clinical applications of stem cell-derived exosomes

Although stem cell-based therapy has demonstrated considerable potential to manage certain diseases more successfully than conventional surgery, it nevertheless comes with inescapable drawbacks that might limit its clinical translation. Compared to stem cells, stem cell-derived exosomes possess numerous advantages, such as non-immunogenicity, non-infusion toxicity, easy access, effortless preservation, and freedom from tumorigenic potential and ethical issues. Exosomes can inherit similar therapeutic effects from their parental cells such as embryonic stem cells and adult stem cells through vertical delivery of their pluripotency or multipotency. After a thorough search and meticulous dissection of relevant literature from the last five years, we present this comprehensive, up-to-date, specialty-specific and disease-oriented review to highlight the surgical application and potential of stem cell-derived exosomes. Exosomes derived from stem cells (e.g., embryonic, induced pluripotent, hematopoietic, mesenchymal, neural, and endothelial stem cells) are capable of treating numerous diseases encountered in orthopedic surgery, neurosurgery, plastic surgery, general surgery, cardiothoracic surgery, urology, head and neck surgery, ophthalmology, and obstetrics and gynecology. The diverse therapeutic effects of stem cells-derived exosomes are a hierarchical translation through tissue-specific responses, and cell-specific molecular signaling pathways. In this review, we highlight stem cell-derived exosomes as a viable and potent alternative to stem cell-based therapy in managing various surgical conditions. We recommend that future research combines wisdoms from surgeons, nanomedicine practitioners, and stem cell researchers in this relevant and intriguing research area.

Orthopedic surgeon-scientist representation is low among National Institutes of Health grants for rotator cuff research

Background

The purpose of this study is to characterize National Institutes of Health (NIH) funding for rotator cuff research and evaluate the impact of orthopedic surgeons on this portfolio.

Methods

The NIH's Research Portfolio Online Reporting Tools Expenditures and Results database was queried for "rotator cuff repair" or "rotator cuff tear" from the 2011 to 2021 fiscal years. Compound annual growth rates were calculated and grants were categorized by basic, clinical, or translational research. Funding totals were compared by Principal Investigator (PI) and grant characteristics.

Results

A total of 52 grants were awarded to 38 PIs between 2011 and 2021, totaling $40,156,859. Annual NIH funding for rotator cuff tear and rotator cuff repair increased by a Compound annual growth rate of 11.0% from 2011 to 2021, compared to 3.4% for the total NIH budget. Orthopedic surgeon-scientists received $9,208,212 (22.9%), most commonly through R01 (80.5%) and K08 (7.1%) mechanisms. No significant difference in funding was found by PI sex (P = .332), degree (P = .460), academic rank (P = .118), or researcher type (P = .227). Professors had a higher h-index than associate and assistant professors (P = .001). Orthopedic surgeon-scientists had a higher h-index (mean 36.3 ± 9.4) compared to clinician-scientists (mean 8.0 ± 1.4) and research-scientists (35.5 ± 40.7) (P = .044). Clinical topics receiving the highest funding were rehabilitation (23.9%), diagnosis, (22.3%) and surgical technique (14.8%). Orthopedic surgeon-scientists acquired funding for diagnosis (57.1%), rehabilitation (17.0%), and surgical technique (14.5%).

Discussion

While NIH funding for rotator cuff research is growing, orthopedic surgeon representation is low. Future studies should evaluate barriers to obtaining funding for orthopedic surgeon-scientists.

Long-lasting decreased pain threshold negatively affects functional recovery after arthroscopic rotator cuff repair

PURPOSE

The relationship between sensitization and postoperative function in patients undergoing arthroscopic rotator cuff repair (ARCR). The purpose of this study was to evaluate the effect of pre-and postoperative reductions in the pressure pain threshold (PPT) on postoperative clinical outcomes in patients with ARCR and investigate changes in PPT and clinical outcomes resulting from postoperative administration of weak opioids activating the central inhibitory system.

METHODS

This retrospective study included patients who underwent primary ARCR, categorized into Group A (excellent/good Constant scores) and B (fair/poor Constant scores). In a complementary study, patients were randomized to the Control or Tramadol groups. Both studies evaluated the PPT, visual analog scale, active range of motion (ROM), Constant score, and retear rates pre-and postoperatively.

RESULTS

In the primary study with 158 patients, those with poor clinical outcomes exhibited significantly lower PPT at the affected shoulder preoperatively at 3 months postoperatively compared to those with good outcomes. The PPT of the affected side was lower than that of the uninvolved side not only at 1 and 3 months but also preoperatively and at 6 months in the poor outcome group. In the secondary study involving 96 patients, weak opioid administration was associated with increased PPT for 3 months, improved ROM at 3 months postoperatively, and reduced postoperative pain 1 year postoperatively.

CONCLUSION

Patients experiencing poor postoperative clinical outcomes exhibited prolonged lowered PPT. Lowered PPT due to sensitization may adversely affect functional recovery and pain perception. Elevating PPT using weak opioids improved clinical outcomes during the acute perioperative period after ARCR.

LEVEL OF EVIDENCE

III.

Contrast-Enhanced Ultrasound-Assessed Supraspinatus Muscle Perfusion Indicates Better Tissue Vitality and Outcome After Supraspinatus Tendon Repair and Subacromial Decompression

OBJECTIVE

Supraspinatus tendon (SSP) tears are a frequent indication for shoulder surgery. Therapy options include physiotherapy, tendon repair and less invasive surgical options like subacromial decompression (SAD). The selection of the most appropriate treatment depends on the specific characteristics and needs of each patient subgroup. Typically, physically active patients are candidates for tendon repair, while a conservative approach is preferred for individuals with severe muscle degeneration or low physical demands. The goal of this study was to assess the impact of contrast-enhanced ultrasound (CEUS)-assessed SSP muscle perfusion on post-operative shoulder function and tendon healing in patients undergoing SSP repair or SAD, thereby enhancing personalized therapy for SSP tendon tears.

METHODS

Two cohorts of patients with SSP tendon tears were treated either by SAD or tendon repair. Pre-operative and 6-month post-operative SSP muscle perfusion was quantified using CEUS and investigated as a surrogate for tissue vitality. The magnetic resonance imaging-derived parameters fatty infiltration and tendon retraction and established shoulder function scores were assessed pre- and post-operatively.

RESULTS

Thirty-five SSP repair patients were compared with 20 SAD patients. Pre-operative perfusion was comparable in the SAD and SSP repair cohorts when a re-tear occurred (wash-in perfusion index = 103.8 ± 124.0 vs. 114.6 ± 155.0, p = 0.83), while being significantly higher among patients with an intact repair (103.8 ± 124 vs. 325.4 ± 388.6, p = 0.006). Below-median pre-operative muscle perfusion was associated with lower post-operative shoulder function (Constant score: 59 ± 28 vs. 78 ± 19, p = 0.012).

CONCLUSION

CEUS can visualize SSP muscle perfusion as a surrogate for tissue vitality and tendon healing, which is associated with better post-operative shoulder function.

Many patients fail to achieve MCID for PROMIS upper extremity and pain interference following nonoperative management of rotator cuff tears

Background

Efficacy of nonoperative treatment for rotator cuff tears has been debated, especially for full-thickness tears. The purpose of this study was to a) define the minimal clinically important difference (MCID) of nonoperative treatment with regard to Patient-Reported Outcomes Measurement Information System (PROMIS) pain interference (PI) and upper extremity (UE), and b) determine the proportion of patients with both partial and full-thickness tears (PTRCT, FTRCT) who achieve this improvement following initial nonoperative treatment. We hypothesized that >75% of PTRCT and FTRTC patients would achieve MCID for PROMIS PI and UE.

Methods

We performed a retrospective cohort study evaluating nonoperatively managed patients with image-confirmed PTRCT and FTRCT. Treatment modalities and follow-up PROMIS scores at least 6 months after their initial visit were recorded. Using a distribution technique, MCID was calculated.

Results

A total of 111 FTRCT and 68 PTRCT patients were included with at least 6 months of follow-up. At 6 months from initial presentation, the MCID for PROMIS UE was 3.75 and 3.95 for FTRCT and PTRCT patients, respectively. For PROMIS PI, the MCID was 3.35 and 3.90 for FTRCT and PTRCT, respectively. In total, 41% of FTRCT and 41% of PTRCT achieved MCID for PROMIS UE. Thirty-four percent of FTRCT and 35% of PTRCT achieved MCID for PROMIS PI.

Conclusion

The majority of patients undergoing nonoperative treatment for supraspinatus/infraspinatus rotator cuff tears did not achieve MCID at 6 months for PROMIS PI (34% for FTRCT and 35% for PTRCT) or UE (41% for FTRCT and 41% for PTRCT).

What are patients asking and reading online? An analysis of online patient searches for rotator cuff repair

BACKGROUND

Patients undergoing rotator cuff surgery often search the internet for information regarding the procedure. One popular source, Google, compiles frequently asked questions and links to websites that may provide answers. This study provides an analysis of the most frequently searched questions associated with rotator cuff surgery. We hypothesize that there will be distinct search patterns associated with online queries about rotator cuff surgery that could provide unique insights into patient concerns.

METHODS

A set of search terms were entered into Google Web Search using a clean-install Google Chrome browser. Frequently associated questions and their webpages were extracted to a database via a data mining extension. Questions were categorized by topics relevant for rotator cuff arthroscopy. Websites were categorized by source and scored for quality using the JAMA Benchmark Criteria. Pearson's χ2 tests were used to analyze nominal data. Student t tests were performed to compare JAMA Benchmark Scores.

RESULTS

Of the 595 questions generated from the initial search, 372 unique questions associated with 293 websites were extracted and categorized. The most popular question topics were activities/restrictions (20.7%), pain (18.8%), and indications/management (13.2%). The 2 most common websites searched were academic (35.2%) and medical practice (27.4%). Commercial websites were significantly more likely to be associated with questions about cost (57.1% of all cost questions, P = .01), anatomy/function (62.5%, P = .001), and evaluation of surgery (47.6%, P < .001). Academic websites were more likely to be associated with questions about technical details of surgery (58.1%, P < .001). Medical practice and social media websites were more likely associated with activities/restrictions (48.1%, P < .001, and 15.6%, P < .001, respectively). Government websites were more likely associated with timeline of recovery (12.8%, P = .01). On a scale of 0-4, commercial and academic websites had the highest JAMA scores (3.06 and 2.39, respectively).

CONCLUSION

Patients seeking information regarding rotator cuff repair primarily use the Google search engine to ask questions regarding postoperative activity and restrictions, followed by pain, indications, and management. Academic websites, which were associated with technical details of surgery, and medical practice websites, which were associated with activities/restrictions, were the 2 most commonly searched resources. These results emphasize the need for orthopedic surgeons to provide detailed and informative instructions to patients undergoing rotator cuff repair, especially in the postoperative setting.

Social determinants of health and race are independent predictors of reduced rotator cuff surgery rates in the Medicare population

BACKGROUND

Racial disparities have been shown to influence rates of surgery for patients with rotator cuff disease. Some individuals have attributed adverse social determinants of health (SDOHs) as potential confounders of this relationship between race and surgery rate. However, there is a paucity of literature observing whether adverse SDOHs and race independently influence rotator cuff surgery rates. Therefore, the purpose of this study was to determine whether adverse SDOHs and race are independent predictors of rotator cuff surgery rates for Medicare beneficiaries.

METHODS

A retrospective analysis was conducting using the Medicare Standard Analytic Files (SAF) data set of the PearlDiver database, observing 211,340 patients with rotator cuff pathology. Univariate and multivariable regression analyses were performed to observe whether race and adverse SDOHs were independent variables associated with rotator cuff surgery rates. To determine whether adverse SDOHs significantly influenced racial disparities, stratified analyses of patients with ≥1 adverse SDOH and those without adverse SDOHs were conducted to compare the odds ratios (ORs) and 95% confidence intervals (CIs) of racial disparities.

RESULTS

Among patients with rotator cuff disease, 21,679 (10.26%) were of nonwhite race and 21,835 (10.33%) had ≥1 adverse SDOH. The variables of nonwhite race (OR, 0.622; 95% CI, 0.599-0.668; P < .001) and having ≥1 adverse SDOH (OR, 0.715; 95% CI, 0.501-0.814; P < .001) were independent predictors of not undergoing surgery. On stratified analysis, there was no significant difference in racial disparities in patients with ≥1 adverse SDOH (OR, 0.620; 95% CI, 0.440-0.875) and those without adverse SDOHs (0.635; 95% CI, 0.601-0.671) based on overlapping 95% CIs.

DISCUSSION

This study demonstrated that among Medicare beneficiaries, adverse SDOHs and race are independent predictors of lower rotator cuff surgery rates, emphasizing the need to address disparities based on race alone.

The Effects of Pre-existing Mood Disorders on Patient-Reported Outcomes After Arthroscopic Rotator Cuff Repair: A Systematic Review and Meta-analysis

BACKGROUND

The purpose of this study was to systematically review the literature to evaluate the effect of pre-existing mood disorders on patient-reported outcomes after arthroscopic rotator cuff repair (ARCR).

METHODS

Two independent reviewers performed a literature search using the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines using PubMed, Embase, Cochrane Library, and Scopus databases. Only studies which grouped as either having a pre-existing mood disorder (namely anxiety and/or depression) or not and evaluated patient-reported outcomes following ARCR procedures were considered for inclusion. Meta-analysis was performed on outcomes using RevMan, with a p-value <0.05 being deemed statistically significant.

RESULTS

Our search found 8 studies including 1,166 shoulders (58.9% males), with an average age of 57.7 ± 3.2 years (21-81) and mean follow-up of 20.8 ± 16.7 months (3-77) which met our inclusion criteria. There were a total of 262 patients (22.5%; mean age 59.9 ± 1.4 years) with pre-existing anxiety and/or depression and 904 patients (77.5%; mean age 59.7 ± 1.7 years) in the control group who underwent ARCR, respectively. Meta-analysis found significantly lower American Shoulder and Elbow Surgeons scores as well as Simple Shoulder Test scores in patients with pre-existing anxiety and/or depression when compared with a control (mean difference [MD] -7.92 [-9.45, -6.40], p < 0.0001, I2 = 0%; MD -1.56 [-2.54, -0.59], p = 0.002, I2 = 80%, respectively) In addition, meta-analysis demonstrated significantly higher Visual Analog Scale scores for pain in patients with pre-existing anxiety and/or depression when compared with a control (MD 0.70 [0.02, 1.38], p = 0.04, I2 = 71%). Furthermore, meta-analysis performed found that ARCR resulted in significant changes in the rates of reported anxiety and/or depression in patients with pre-existing anxiety and/or depression (MD 4.06[-2.47, 6.68], p < 0.0001, I2 = 0%).

CONCLUSION

Our review found that patients with pre-existing mood disorders were significantly more likely to report higher rates of postoperative pain and poorer functional outcomes following ARCR procedures, when compared with controls without mood disorders. Therefore, the presence of pre-existing anxiety and/or depression warrants consideration in the management paradigm for patients with rotator cuff tears. More optimistically, however, ARCR resulted in significant improvements in anxiety and/or depressive symptoms postoperatively.

LEVEL OF EVIDENCE

Level III; systematic review of retrospective comparative studies. See Instructions for Authors for a complete description of levels of evidence.

Application of Machine Learning Algorithms for Prognostic Assessment in Rotator Cuff Pathologies: A Clinical Data-Based Approach

AIM

The overall aim of this proposal is to ameliorate the care of rotator cuff (RC) tear patients by applying an innovative machine learning approach for outcome prediction after arthroscopic repair.

MATERIALS AND METHODS

We applied state-of-the-art machine learning algorithms to evaluate the best predictors of the outcome, and 100 RC patients were evaluated at baseline (T0), after 1 month (T1), 3 months (T2), 6 months (T3), and 1 year (T4) from surgical intervention. The outcome measure was the Costant-Murley Shoulder Score, whereas age, sex, BMI, the 36-Item Short-Form Survey, the Simple Shoulder Test, the Hospital Anxiety and Depression Scale, the American Shoulder and Elbow Surgeons Score, the Oxford Shoulder Score, and the Shoulder Pain and Disability Index were considered as predictive factors. Support vector machine (SVM), k-nearest neighbors (k-NN), naïve Bayes (NB), and random forest (RF) algorithms were employed.

RESULTS

Across all sessions, the classifiers demonstrated suboptimal performance when using both the complete and shrunken sets of features. Specifically, the logistic regression (LR) classifier achieved a mean accuracy of 46.5% ± 6%, while the random forest (RF) classifier achieved 51.25% ± 4%. For the shrunken set of features, LR obtained a mean accuracy of 48.5% ± 6%, and RF achieved 45.5% ± 4.5%. No statistical differences were found when comparing the performance metrics of ML algorithms.

CONCLUSIONS

This study underlines the importance of extending the application of AI methods to new predictors, such as neuroimaging and kinematic data, in order to better record significant shifts in RC patients' prognosis.

LIMITATIONS

The data quality within the cohort could represent a limitation, since certain variables, such as smoking, diabetes, and work injury, are known to have an impact on the outcome.

The relationship between preoperative Goutallier stage and retear rates following posterosuperior rotator cuff repair: a systematic review

BACKGROUND

An association between higher preoperative Goutallier stage and higher retear rates following primary rotator cuff repairs has been previously reported. However, there are few reviews which have described clear retear rates for each repaired tendon classified according to preoperative Goutallier stage. The purpose of this study was therefore to systematically review the literature on the relationship between preoperative Goutallier stage and retear rates and provide predictable retear rates following primary repair of posterosuperior rotator cuff tears.

METHODS

A systematic literature review was performed in compliance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and checklist utilizing PubMed, MEDLINE, and Cochrane Library. English-language studies of Level I through IV evidence examining the clinical results of primarily repaired posterosuperior rotator cuff tears as a function of Goutallier stage using magnetic resonance imaging were included. The primary outcome of interest was retear rates according to preoperative Goutallier stage. As a secondary outcome, rotator cuff tears were divided into 2 subgroups (Goutallier stage 0-2 and 3-4) and retear rates were assessed between the 2 subgroups. A random effects model with binomial within-study variance was used for both outcomes.

RESULTS

Nine studies (687 shoulders) satisfied all inclusion criteria and reported sufficient data for statistical analysis. In the supraspinatus muscle group, rotator cuff muscles with preoperative Goutallier stages of 0, 1, and 2 had retear rates of 19.1%, 27.8%, and 33.5%, respectively, with no significant differences between each category. In contrast, when preoperative Goutallier stage of 3 and 4 existed, significant differences compared to Goutallier 0, 1, and 2 were observed with a retear rate of 74.1% and 78.5%, respectively. In the infraspinatus muscle group, the retear rates following rotator cuff repairs were 20.0%, 32.1%, and 35.1% in Goutallier 0, 1, and 2, respectively, with no significant differences between each category. In Goutallier 3 and 4, the rate was 76.6% and 100.0%, respectively, with significant differences compared to Goutallier 0, 1, and 2.

CONCLUSION

The results of this study have clearly demonstrated that retear rates following surgical repair of the rotator cuff increased in proportion to the preoperative Goutallier stage in both the supraspinatus and infraspinatus muscles.

Arthroscopic Rotator Cuff Repair Results in Improved Clinical Outcomes and Low Revision Rates at 10-Year Follow-Up: A Systematic Review

PURPOSE

To study the literature to evaluate the functional outcomes, radiologic outcomes, and revision rates following arthroscopic rotator cuff repair (ARCR) at a minimum of 10-years follow-up.

METHODS

Two independent reviewers performed a literature search of PubMed, Embase, and Scopus using the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines. Only studies reporting on outcomes of ARCR with a minimum 10-year follow-up were considered for inclusion. Patient demographics, satisfaction, and clinical, radiologic, and surgical outcomes were evaluated.

RESULTS

Our search found 9 studies including 455 shoulders in 448 patients (51.6% male patients), with age at time of surgery ranging from 45 to 90 years met our inclusion criteria. Overall follow-up ranged from 10 to 18 years. At final follow-up, the ranges of American Shoulder & Elbow Surgeons, age- and sex-adjusted Constant-Morley, and University of California Los Angeles scores were reported in 5, 6, and 3 studies, respectively, as 79.4 to 93.2, 73.2 to 94, and 26.5 to 33, respectively. Of the included studies, satisfaction rates varied in 6 studies from 85.7% to 100% in the long-term. Additionally, the overall radiologic retear rate ranged from 9.5% to 63.2%. The overall surgical revision rates ranged in 6 studies from 3.8% to 15.4%, with from 0% to 6.7% requiring revision ARCR and from 1.0% to 3.6% requiring revision subacromial decompression in 6 and 2 studies, respectively, at minimum 10-years' follow-up.

CONCLUSIONS

In this study, we found that ARCR results in high rates of patient satisfaction, satisfactory clinical outcomes with respect to patient-reported functional outcomes and range of motion, and low revision rates at minimum 10-years' follow-up. However, an overall 30% retear rate was observed in asymptomatic patients.

LEVEL OF EVIDENCE

Level IV, systematic review of Level II-IV studies.

Interprofessional Active Learning for Chronic Pain: Transforming Student Learning From Recall to Application

Chronic pain (CP) affects over 50 million Americans daily and represents a unique challenge for healthcare professionals due to its complexity. Across all health professions, only a small percentage of the curriculum is devoted to treating patients with CP. Unfortunately, much of the content is delivered passively via lecture without giving students an opportunity to practice the communication skills to effectively treat patients in the clinic. An interprofessional team of health educators identified 5 essential messages that students frequently struggle to convey to patients with CP. Those messages were based on interprofessional and profession-specific competencies to treat patients with CP from the International Association for the Study of Pain. The 5 messages highlighted the importance of (1) therapeutic alliance, (2) consistent interdisciplinary language, (3) patient prognosis, (4) evidence for pain medicine, surgery, and imaging, and (5) early referral to the interprofessional team. For each message, the team summarized relevant research supporting the importance of each individual message that could serve as a foundation for didactic content. The team then developed active learning educational activities that educators could use to have students practice the skills tied to each message. Each learning activity was designed to be delivered in an interprofessional manner.

The effect of single-dose, preoperative intravenous tranexamic acid on early postoperative pain scores after rotator cuff repair: a double-blind, randomized controlled trial

BACKGROUND

Tranexamic acid (TXA) is commonly used in upper and lower limb arthroplasty to limit blood loss and postoperative hematoma formation. The role of TXA in rotator cuff repair (RCR) surgery is less defined. This trial assessed the effect of preoperative TXA on early postoperative pain scores.

METHODS

A randomized double-blind trail was conducted in 89 patients undergoing RCR. Patients were randomized to either 2 g of intravenous TXA or placebo at induction. The primary outcome was visual analog scale (VAS)-pain score at day 3 postoperation, with secondary outcomes including VAS-pain, American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), and Constant scores at 2, 8, 24, and 52 weeks.

RESULTS

There was no significant difference in VAS-pain scores between groups at day 3 postoperation. Pain scores were significantly better in the TXA group at 8 weeks. There was no difference between groups at any time point in the ASES or Constant score. The TXA group had improved motion at 6 months with a reduced rate of secondary adhesive capsulitis.

CONCLUSION

TXA did not improve postoperative pain scores after RCR, however, patients who received the intervention demonstrated greater range of motion at 6 months with lower rates of secondary adhesive capsulitis.