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Henao Romero S, Sierra Peña JA, Diaz Orduz RC, Berbeo-Calderon ME. Horizontal Gaze Assessment: An Extensive Narrative Review. World Neurosurg 2024:S1878-8750(24)00788-5. [PMID: 38750886 DOI: 10.1016/j.wneu.2024.05.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Accepted: 05/07/2024] [Indexed: 06/09/2024]
Abstract
OBJECTIVE Bipedalism was a significant milestone in the evolutionary development of Homo sapiens sapiens, influencing neocortical evolution and subsequent behavioral changes. Coordinated visual and sensory inputs are crucial for posture, environmental interaction, and surgical planning, with horizontal gaze being a pivotal parameter. This narrative review aims to explore various geometric measures used to assess horizontal gaze in patients, highlighting their applications in surgical planning. METHODS A literature review was conducted in indexed databases using Mesh terms like "Cervical Vertebrae" and "Visual Fields" along with keywords such as "horizontal gaze" and "sagittal spine parameters." Among 477 initially identified articles, 41 were selected for inclusion after rigorous filtering. RESULTS The most recognized method for assessing horizontal gaze is the Chin Brow Vertical Angle (CBVA), initially described in patients with ankylosing spondylitis. Clinical photography is employed as a tool for CBVA calculation, while other measures like McGregor slope and Slope of the Line of Sight have been considered as alternatives to CBVA. Each method presents its unique advantages and limitations. CONCLUSIONS This review highlights the need for further research into horizontal gaze measurement methods. Developing novel approaches to determine horizontal gaze can significantly enhance surgical planning and, consequently, improve patient outcomes. The ongoing exploration of these geometric measures offers promising prospects for advancing the field and optimizing patient care.
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Affiliation(s)
- Sara Henao Romero
- Department of Neurosurgery, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia; Neurosurgery research seedbed, Pontificia Universidad Javeriana, Bogotá, Colombia.
| | | | - Roberto Carlos Diaz Orduz
- Department of Neurosurgery, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia
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Al-Adli NN, Tummala S, Oh MC. Early radiographic outcomes after anterior cervical discectomy and fusion with anatomic versus lordotic cages. NORTH AMERICAN SPINE SOCIETY JOURNAL 2024; 17:100292. [PMID: 38193109 PMCID: PMC10772290 DOI: 10.1016/j.xnsj.2023.100292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/08/2023] [Accepted: 11/10/2023] [Indexed: 01/10/2024]
Abstract
Background Anterior cervical discectomy and fusion (ACDF) interbody implants are shaped anatomically, with a convex superior aspect, or lordotically, with an angle and flat surfaces. However, the effect of implant shape on cervical sagittal balance (CSB) is not well described. Methods Of the 192 cases reviewed from 2018 to 2019, 118 were included with matching pre- and postoperative imaging. Cases were categorized by interbody implant type (anatomic or lordotic) and number of levels fused (1-level, 2-level, etc.). SurgiMap was used to measure cervical lordosis (CL), C2-C7 sagittal vertical axis (cSVA), T1 slope (T1S), and T1S minus CL (T1S-CL) on pre- and postoperative imaging. Pre- and postoperative parameters were compared within and between each cohort. Change in CL (ΔCL), cSVA (ΔcSVA), and T1S-CL (ΔT1S-CL) were calculated as the difference between pre- and postoperative values and were compared accordingly (1) anatomic versus lordotic and (2) 1-level versus 2-level versus 3-level fusion. Results Thirty-nine (33.1%), 57 (48.3%), and 22 (18.6%) cases comprised the anatomic, lordotic, and mixed (anatomic and lordotic) groups, respectively. ACDFs improved CL and T1S-CL by 5.71° (p<.001) and 3.32° (p<.01), respectively. CL was improved in the lordotic (5.27°; p<.01) and anatomic (4.57°; p<.01) groups, while only the lordotic group demonstrated improvement in T1S-CL (3.4°; p=.02). There were no differences in ΔCL (p=.70), ΔcSVA (p=.89), or ΔT1S-CL (p=.1) between the groups. Two- and 3-level fusions improved CL by 7.48° (p<.01) and 9.62° (p<.01), and T1S-CL by 4.43° (p<.01) and 5.96° (p<.01), respectively. Conclusions Overall, ACDFs significantly improved CL and T1S-CL however, there were no differences in CSB correction between the anatomic and lordotic groups. Two- and 3-level fusions more effectively improved CL (vs. single-level) and T1S-CL (vs. 3-level). These results suggest that implants should continue to be personalized to the patient's anatomy, however, future research is needed to validate these findings and incorporate the effects of preoperative deformities.
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Affiliation(s)
- Nadeem N. Al-Adli
- Texas Christian University School of Medicine, TCU Box 297085, Fort Worth, Texas 76129, USA
| | - Siri Tummala
- Texas Christian University School of Medicine, TCU Box 297085, Fort Worth, Texas 76129, USA
| | - Michael C. Oh
- Methodist Moody Brain and Spine Institute, 1411 North Beckley Ave, Pavilion III, Suite 152, Dallas, TX 75203, USA
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Liu X, Jin L, Jiang C, Jiang X, Chen Z, Cao Y. Characteristics of cervical intervertebral disc signal intensity: an analysis of T2-weighted magnetic resonance imaging in 5843 asymptomatic Chinese subjects. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2023; 32:2415-2424. [PMID: 37156851 DOI: 10.1007/s00586-023-07742-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 03/08/2023] [Accepted: 04/22/2023] [Indexed: 05/10/2023]
Abstract
PURPOSE The study aimed to observe cervical intervertebral discs (IVDs) in asymptomatic subjects and to explore the factors associated with cervical intervertebral disc degeneration (IVDD). METHODS Cervical spine MRI of 5843 subjects was retrospectively analyzed. On the sagittal T2-weighted MR images, the mean signal intensities of the nucleus pulposus were obtained. Standard signal intensity (SSI) of intervertebral discs was defined as the ratio of mean disc signal intensity to mean CSF signal intensity. RESULTS In subjects under 70 years old, the SSI of IVD was lowest at the C5/6 level. In those over 70, the SSI of IVD was similar among the disc levels from C2/3 to C7/T1. The disc SSI decreased significantly with age in both genders. In subjects under 70 years old, the SSI of the discs at each level was higher in females than in males. In those over 70 years old, no difference was found in disc SSI between two genders at most disc levels. Logistic regression analysis showed that kyphotic and straight cervical spine, obesity and older age were associated with higher risk of having lower disc SSI. CONCLUSION To our knowledge, this is the largest cross-sectional study using MRI-based quantitative assessment to characterize cervical IVDD in asymptomatic subjects. Cervical IVDD was shown to progress with age and significantly correlated with gender, BMI and cervical alignment. Early intervention of related factors may help delay cervical IVDD and prevent future neck and shoulder pain.
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Affiliation(s)
- Xinhua Liu
- Department of Rehabilitation Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Lixia Jin
- Department of Rehabilitation Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Chang Jiang
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Xiaoxing Jiang
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Zixian Chen
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
| | - Yuanwu Cao
- Department of Orthopedics, Zhongshan Hospital, Fudan University, Shanghai, China.
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Passias PG, Kummer N, Williamson TK, Moattari K, Lafage V, Lafage R, Kim HJ, Daniels AH, Gum JL, Diebo BG, Protopsaltis TS, Mundis GM, Eastlack RK, Soroceanu A, Scheer JK, Hamilton DK, Klineberg EO, Line B, Hart RA, Burton DC, Mummaneni P, Chou D, Park P, Schwab FJ, Shaffrey CI, Bess S, Ames CP, Smith JS. Highest Achievable Outcomes for Patients Undergoing Cervical Deformity Corrective Surgery by Frailty. Neurosurgery 2022; 91:693-700. [PMID: 36084195 DOI: 10.1227/neu.0000000000002091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 05/26/2022] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Frailty is influential in determining operative outcomes, including complications, in patients with cervical deformity (CD). OBJECTIVE To assess whether frailty status limits the highest achievable outcomes of patients with CD. METHODS Adult patients with CD with 2-year (2Y) data included. Frailty stratification: not frail (NF) <0.2, frail (F) 0.2 to 0.4, and severely frail (SF) >0.4. Analysis of covariance established estimated marginal means based on age, invasiveness, and baseline deformity, for improvement, deterioration, or maintenance in Neck Disability Index (NDI), Modified Japanese Orthopaedic Association (mJOA), and Numerical Rating Scale Neck Pain. RESULTS One hundred twenty-six patients with CD included 29 NF, 83 F, and 14 SF. The NF group had the highest rates of deterioration and lowest rates of improvement in cervical Sagittal Vertical Axis and horizontal gaze modifiers. Two-year improvements in NDI by frailty: NF: -11.2, F: -16.9, and SF: -14.6 (P = .524). The top quartile of NF patients also had the lowest 1-year (1Y) NDI (7.0) compared with F (11.0) and SF (40.5). Between 1Y and 2Y, 7.9% of patients deteriorated in NDI, 71.1% maintained, and 21.1% improved. Between 1Y and 2Y, SF had the highest rate of improvement (42%), while NF had the highest rate of deterioration (18.5%). CONCLUSION Although frail patients improved more often by 1Y, SF patients achieve most of their clinical improvement between 1 and 2Y. Frailty is associated with factors such as osteoporosis, poor alignment, neurological status, sarcopenia, and other medical comorbidities. Similarly, clinical outcomes can be affected by many factors (fusion status, number of pain generators within treated levels, integrity of soft tissues and bone, and deformity correction). Although accounting for such factors will ultimately determine whether frailty alone is an independent risk factor, these preliminary findings may suggest that frailty status affects the clinical outcomes and improvement after CD surgery.
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Affiliation(s)
- Peter G Passias
- Department of Orthopedic and Neurosurgery, NYU Langone Orthopedic Hospital, New York Spine Institute, New York, New York, USA
| | - Nicholas Kummer
- Department of Orthopedic and Neurosurgery, NYU Langone Orthopedic Hospital, New York Spine Institute, New York, New York, USA
| | - Tyler K Williamson
- Department of Orthopedic and Neurosurgery, NYU Langone Orthopedic Hospital, New York Spine Institute, New York, New York, USA
| | - Kevin Moattari
- Department of Orthopedic and Neurosurgery, NYU Langone Orthopedic Hospital, New York Spine Institute, New York, New York, USA
| | - Virginie Lafage
- Department of Orthopedics, Lenox Hill Hospital, Northwell Health, New York, New York, USA
| | - Renaud Lafage
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York, USA
| | - Han Jo Kim
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York, USA
| | - Alan H Daniels
- Department of Orthopaedic Surgery, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, Rhode Island, USA
| | - Jeffrey L Gum
- Norton Leatherman Spine Center, Louisville, Kentucky, USA
| | - Bassel G Diebo
- Department of Orthopaedic Surgery, SUNY Downstate Medical Center, Brooklyn, New York, USA
| | - Themistocles S Protopsaltis
- Department of Orthopaedic Surgery, NYU Langone Orthopaedic Hospital, NYU Langone Health, New York, New York, USA
| | - Gregory M Mundis
- Division of Orthopaedic Surgery, Scripps Clinic Medical Group, La Jolla, California, USA
| | - Robert K Eastlack
- Department of Orthopaedic Surgery, Scripps Clinic, San Diego, California, USA
| | - Alexandra Soroceanu
- Department of Orthopaedic Surgery, University of Calgary, Calgary, Alberta, Canada
| | - Justin K Scheer
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - D Kojo Hamilton
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Eric O Klineberg
- Department of Orthopaedic Surgery, UC Davis Health System, Sacramento, California, USA
| | - Breton Line
- Department of Spine Surgery, Denver International Spine Center, Presbyterian St. Luke's Medical Center/Rocky Mountain Hospital for Children, Denver, Colorado, USA
| | - Robert A Hart
- Department of Orthopaedic Surgery, Swedish Neuroscience Institute, Seattle, Washington, USA
| | - Douglas C Burton
- Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Praveen Mummaneni
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Dean Chou
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Paul Park
- Department of Neurosurgery, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Frank J Schwab
- Department of Orthopedics, Lenox Hill Hospital, Northwell Health, New York, New York, USA
| | - Christopher I Shaffrey
- Division of Spine, Departments of Neurosurgery and Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Shay Bess
- Department of Spine Surgery, Denver International Spine Center, Presbyterian St. Luke's Medical Center/Rocky Mountain Hospital for Children, Denver, Colorado, USA
| | - Christopher P Ames
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Justin S Smith
- Department of Orthopaedic Surgery, University of Virginia, Charlottesville, Virginia, USA
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