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Sonve AS, Joshi AR, Rai PR, Achhapalia Y. Determining the Normal Glenoid Version in the Indian Population. Indian J Radiol Imaging 2024; 34:435-440. [PMID: 38912251 PMCID: PMC11188746 DOI: 10.1055/s-0044-1778725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/25/2024] Open
Abstract
Background Glenoid version refers to the angle subtended by the glenoid with the scapula. On average, it is 0 ± 10 degrees with a slight propensity toward retroversion. Numerous factors such the dominance(handedness), gender, ethnicity, and pathology are known to affect version. Version has important consequences on the biomechanics of the shoulder joint and is altered in those with arthritis and shoulder joint instability. Aim Our study aimed to determine the normal range of glenoid version in the population. Further, we aim to assess the relationship between gender and version. Settings and Design We conducted a retrospective observational study in a tertiary referral hospital with a target sample size of 200 shoulders. Methods and Materials The computed tomography images were retrospectively reviewed to determine the scapular shape and the glenoid version angle. Statistical Analysis Statistical analysis was done using SPSS v.22 software with p -value less than 0.05 considered as significant. Results The mean age of the individuals in our study was 44 years. In our study, irrespective of gender, most individuals had some degree of anteversion and males had lower degree of anteversion. Previous studies have shown that most normal individuals usually have retroverted shoulder joints. The mean glenoid version was significantly lower in the right than in the left shoulder and males had significantly lower mean glenoid version than females in both shoulders. Most individuals in our study had a flat scapular spine. Conclusion This study shows that the Indian population may have a slight propensity toward anteversion and this has an important bearing on shoulder arthroplasty. Further, this study shows that significantly lower degrees of version are found on the right side and that the degree of version is significantly lower in males. Understanding the role of glenoid version in shoulder biomechanics will go a long way in the early identification of pathology, the preoperative planning of shoulder arthroplasty, and the operative restoration of a functional shoulder joint.
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Affiliation(s)
- Ashwini Sankhe Sonve
- Department of Radiology, Lokmanya Tilak Municipal Medical College and Hospital, Mumbai, Maharashtra, India
| | - Anagha Rajeev Joshi
- Department of Radiology, Lokmanya Tilak Municipal Medical College and Hospital, Mumbai, Maharashtra, India
| | - Pareekshith R. Rai
- Department of Radiology, Lokmanya Tilak Municipal Medical College and Hospital, Mumbai, Maharashtra, India
| | - Yash Achhapalia
- Intern, Lokmanya Tilak Municipal Medical College and Hospital, Mumbai, Maharashtra, India
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Hurley ET, O'Grady J, Davey MS, Levin JM, Mojica ES, Gaafar M, Dickens JF, Delaney RA, Mullett H. Glenohumeral morphological predictors of recurrent shoulder instability following arthroscopic Bankart repair. Knee Surg Sports Traumatol Arthrosc 2024; 32:1571-1578. [PMID: 38572679 DOI: 10.1002/ksa.12169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 02/28/2024] [Indexed: 04/05/2024]
Abstract
PURPOSE The purpose of this study was to evaluate glenohumeral morphological features on a magnetic resonance arthrogram (MRA) to determine risk factors for recurrence of anterior shoulder instability following arthroscopic Bankart repair (ABR). METHODS A retrospective review of patients who underwent ABR between 2012 and 2017 was performed to identify patients who had recurrence of instability following stabilisation (Group 1). These were pair-matched in a 2:1 ratio for age, gender and sport with a control (Group 2) who underwent ABR without recurrence. Preoperative MRAs were evaluated for risk factors for recurrence, with glenoid bone loss and Hill-Sachs lesions also measured. Multilinear and multilogistic regression models were used to evaluate factors affecting recurrence. RESULTS Overall, 72 patients were included in this study, including 48 patients without recurrence and 24 patients with recurrent instability. There was a significant difference between the two groups in mean glenoid bone loss (Group 1: 7.3% vs. Group 2: 5.7%, p < 0.0001) and the rate of off-track Hill-Sachs lesions (Group 1: 20.8% vs. Group 2: 0%, p = 0.0003). Of the variables analysed in logistic regression, increased glenoid anteversion (p = 0.02), acromioclavicular (AC) degeneration (p = 0.03) and increased Hill-Sachs width were associated with increased risk of failure. Increased chondral version (p = 0.01) and humeral head diameter in the anteriorposterior view were found to be protective and associated with a greater likelihood of success. CONCLUSION Glenoid anteversion was a risk factor for recurrent instability, whereas increased chondral version and humeral head diameter were associated with higher rates of success following ABR. Glenoid bone loss, presence of an off-track Hill-Sachs lesion, increased Hill-Sachs width and AC degeneration were also associated with failure. These findings should be used by surgeons to stratify risk for recurrence following ABR. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Eoghan T Hurley
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Jack O'Grady
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Martin S Davey
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Jay M Levin
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Edward S Mojica
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Mohammed Gaafar
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Jonathan F Dickens
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Ruth A Delaney
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
| | - Hannan Mullett
- Department of Orthopaedic Surgery, Sports Surgery Clinic, Dublin, Ireland
- Department of Orthopaedic Surgery, Duke University, Durham, North Carolina, USA
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Verweij LPE, Sierevelt IN, van der Woude HJ, Hekman KMC, Veeger HEJD, van den Bekerom MPJ. Surgical Intervention Following a First Traumatic Anterior Shoulder Dislocation Is Worthy of Consideration. Arthroscopy 2023; 39:2577-2586. [PMID: 37597706 DOI: 10.1016/j.arthro.2023.07.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 07/31/2023] [Indexed: 08/21/2023]
Abstract
Up to 60% of patients experience recurrence after a first traumatic anterior shoulder dislocation (FTASD), which is often defined as having experienced either dislocation or subluxation. Thus surgical intervention after FTASD is worthy of consideration and is guided by the number of patients who need to receive surgical intervention to prevent 1 redislocation (i.e., number needed to treat), (subjective) health benefit, complication risk, and costs. Operative intervention through arthroscopic stabilization can be successful in reducing recurrence risk in FTASD, as has been shown in multiple randomized controlled trials. Nevertheless, there is a large "gray area" for the indication of arthroscopic stabilization, and it is therefore heavily debated which patients should receive operative treatment. Previous trials showed widely varying redislocation rates in both the intervention and control group, meta-analysis shows 2% to 19% after operative and 20% to 75% after nonoperative treatment, and redislocation rates may not correlate with patient-reported outcomes. The literature is quite heterogeneous, and a major confounder is time to follow-up. Furthermore, there is insufficient standardization of reporting of outcomes and no consensus on definition of risk factors. As a result, surgery is a reasonable intervention for FTASD patients, but in which patients it best prevents redislocation requires additional refinement.
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Affiliation(s)
- Lukas P E Verweij
- Amsterdam UMC, University of Amsterdam, Department of Orthopedic Surgery and Sports Medicine, Amsterdam, the Netherlands; Amsterdam Movement Sciences, Musculoskeletal Health Program, Amsterdam, the Netherlands; Amsterdam Shoulder and Elbow Centre of Expertise (ASECE), Amsterdam, the Netherlands.
| | - Inger N Sierevelt
- Xpert Clinics, Department of Orthopedic Surgery, Amsterdam, the Netherlands; Spaarnegasthuis Academy, Orthopedic Department, Hoofddorp, the Netherlands
| | - Henk-Jan van der Woude
- Amsterdam Shoulder and Elbow Centre of Expertise (ASECE), Amsterdam, the Netherlands; Department of Radiology, OLVG, Amsterdam, the Netherlands
| | - Karin M C Hekman
- Amsterdam Shoulder and Elbow Centre of Expertise (ASECE), Amsterdam, the Netherlands; Shoulder Center IBC Amstelland, Amstelveen, the Netherlands
| | - H E J DirkJan Veeger
- Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands
| | - Michel P J van den Bekerom
- Amsterdam Shoulder and Elbow Centre of Expertise (ASECE), Amsterdam, the Netherlands; Department of Orthopedic Surgery, Medical Center Jan van Goyen, Amsterdam, the Netherlands; Department of Orthopedic Surgery, Shoulder and Elbow Unit, OLVG, Amsterdam, the Netherlands; Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, the Netherlands
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4
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Niu Z, Shen X, Li M, Fan M, Zuo J, Liu T. Comparison of Glenohumeral Bone Morphology Between Patients With Versus Without Anterior Shoulder Instability. Orthop J Sports Med 2023; 11:23259671231217971. [PMID: 38145224 PMCID: PMC10748947 DOI: 10.1177/23259671231217971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 11/13/2023] [Indexed: 12/26/2023] Open
Abstract
Background The stability of the glenohumeral joint is associated with anatomic characteristics including bony structures and soft tissues. Purpose To compare the differences in specific bony glenohumeral geometries between shoulders with anterior shoulder instability (ASI), unaffected contralateral shoulders, and healthy control shoulders. Study Design Cross-sectional study; Level of evidence, 3. Methods Shoulder computed tomography (CT) scans of 36 patients with ASI and 36 matched healthy controls were retrieved and 3-dimensionally reconstructed. We measured the glenoid radius of curvature (GROC) in the anterior-posterior (AP) and superior-inferior directions, humeral head radius of curvature (HROC) in the AP direction, conformity index, glenoid height, glenoid width, glenoid index, stability angle, glenoid version, and glenoid depth. The differences between the groups were statistically calculated. CT scans of the unaffected contralateral shoulders from 21 of the ASI patients were also collected to identify the consistency of the bony structures in bilateral shoulders. Results Patients with ASI had greater GROC in the AP direction (P < .001), HROC in the AP direction (P = .002), glenoid height (P = .005), and glenoid index (P < .001) and smaller conformity index (P < .001), glenoid width (P = .002), stability angle (P < .001), and glenoid depth (P < .001). In addition, the glenoid of the ASI patients was more anteverted compared with that of controls (P = .001). There was no statistical difference in half the measurements between the bilateral shoulder joints in patients with ASI. Conclusion In this study, glenohumeral geometric differences were found between ASI patients and healthy control participants. Glenoid curvature and conformity index, based on bilateral comparisons of affected and contralateral shoulders, appear inherent and may predict ASI risk.
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Affiliation(s)
- Zhixin Niu
- Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China
- Department of Orthopedics, Jiaozuo People's Hospital, Jiaozuo, Henan Province, China
| | - Xianyue Shen
- Department of Orthopedics, The First Affiliated Hospital of USTC, Division of Life Science and Medicine, University of Science and Technology of China, Hefei, Anhui Province, China
| | - Menglong Li
- Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China
| | - Mingrui Fan
- Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China
| | - Jianlin Zuo
- Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China
| | - Tong Liu
- Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China
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Moore TK, Kilkenny CJ, Hurley ET, Magee BM, Levin JM, Khan SU, Dickens JF, Mullett H. Posterior Shoulder Instability but Not Anterior Shoulder Instability Is Related to Glenoid Version. Arthrosc Sports Med Rehabil 2023; 5:100794. [PMID: 37711163 PMCID: PMC10497783 DOI: 10.1016/j.asmr.2023.100794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 08/08/2023] [Indexed: 09/16/2023] Open
Abstract
Purpose To assess and compare glenoid version in patients with anterior shoulder instability (ASI), posterior shoulder instability (PSI), and a control group. Methods The operative notes of all patients that had undergone arthroscopic shoulder instability repair between January 2017 and May 2022 were retrospectively reviewed. Magnetic resonance imaging scans were then analyzed, and glenoid version was measured by a single blinded observer. A P value <.05 was considered statistically significant. Results There were 100 patients included in the ASI group, 65 in PSI group, and 100 in the control group. The mean glenoid versions for the ASI group were -16°, -9.1°, and -9.2° for the vault version, simplified vault version, and chondrolabral version, respectively. The mean glenoid versions for the PSI group were -21°, -13.4°, and -16.6° for the vault version, simplified vault version, and chondrolabral version, respectively. The mean versions for the control group were -17.8°, -9.5°, and -9.8° for the vault version, simplified vault version and chondrolabral version, respectively. ANOVA testing and post hoc comparisons revealed the PSI group to be significantly more retroverted than both other groups P < .001. The ASI group's degree of glenoid version was not significantly different to that of the control P = .009. Conclusion Patients with PSI have a higher degree of retroversion in comparison to those with ASI and control. There is no significant difference in glenoid version among patients with ASI when compared with control. Level of Evidence Level III, retrospective comparative study.
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Affiliation(s)
- Thomas K. Moore
- Sports Surgery Clinic, Dublin, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Conor J. Kilkenny
- Sports Surgery Clinic, Dublin, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Eoghan T. Hurley
- Sports Surgery Clinic, Dublin, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
- Duke University, Durham, North Carolina, U.S.A
| | | | | | | | | | - Hannan Mullett
- Sports Surgery Clinic, Dublin, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
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Li RT, Sheean A, Wilson K, Sa DD, Kane G, Lesniak B, Lin A. Decreased Glenoid Retroversion Is a Risk Factor for Failure of Primary Arthroscopic Bankart Repair in Individuals With Subcritical Bone Loss Versus No Bone Loss. Arthroscopy 2021; 37:1128-1133. [PMID: 33307148 DOI: 10.1016/j.arthro.2020.11.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 11/25/2020] [Accepted: 11/28/2020] [Indexed: 02/02/2023]
Abstract
PURPOSE To determine whether glenoid retroversion is an independent risk factor for failure after arthroscopic Bankart repair. METHODS This was a retrospective review of patients with a minimum 2-year follow-up. In part 1 of the study, individuals with no glenoid bone loss on magnetic resonance imaging (MRI) and who failed arthroscopic Bankart repair (cases) were compared with individuals who did not fail Bankart repair (controls). In part 2 of the study, cases with subcritical (<20%) glenoid bone loss as measured on sagittal T1 MRI sequences who failed arthroscopic Bankart repair were compared with controls who did not. For each part of the study, glenoid version was measured using axial T2 MRI sequences. Positive angular measurements were designated to represent glenoid anteversion, whereas negative measurements were designated to represent glenoid retroversion. Independent t tests were conducted to determine the association between glenoid version and failure after arthroscopic Bankart repair. RESULTS There were 20 cases and 40 controls in part 1 of the study. In part 2, there were 19 cases and 21 controls. There was no difference in baseline characteristics between cases and controls. Among individuals with no glenoid bone loss, there was no difference in glenoid version between cases and controls (cases: 6.0° ± 8.1° vs controls: 5.1° ± 7.8°, P = .22). Among individuals with subcritical bone loss, cases (3.8° ± 4.4°) were associated with significantly less mean retroversion compared with controls (7.1° ± 2.8°, P = .0085). Decreased retroversion (odds ratio 1.34; 95% confidence interval 1.05-1.72, P = 20) was a significant independent predictor of failure using univariable logistic regression. CONCLUSIONS While glenoid retroversion is not associated with failure after arthroscopic Bankart repair in individuals with no glenoid bone loss, decreased retroversion is associated with failure in individuals with subcritical bone loss. LEVEL OF EVIDENCE Level 3: Retrospective review.
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Affiliation(s)
- Ryan T Li
- Department of Orthopaedic Surgery, WakeMed Health and Hospitals, Raleigh, North Carolina, U.S.A
| | - Andrew Sheean
- Department of Orthopaedic Surgery, San Antonio Military Medical Center, San Antonio, Texas, U.S.A
| | - Kevin Wilson
- Orthopedic Surgery, Mount Nittany Health, State College, Pennsylvania, U.S.A
| | - Darren de Sa
- Division of Orthopaedics, Department of Surgery, McMaster University, Hamilton, Ontario, Canada, Centre for Evidence-Based Orthopaedics, Hamilton, Ontario, Canada
| | - Gillian Kane
- Department of Orthopaedic Sports Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Bryson Lesniak
- Department of Orthopaedic Sports Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Albert Lin
- Department of Orthopaedic Sports Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A..
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Vaswani R, Como C, Fourman M, Wilmot A, Borrero C, Vyas D, Lin A. Glenoid Radius of Curvature and Humeral Head Volume Are Associated With Postoperative Dislocation After Arthroscopic Bankart Repair. Arthrosc Sports Med Rehabil 2021; 3:e565-e571. [PMID: 34027470 PMCID: PMC8129454 DOI: 10.1016/j.asmr.2020.12.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 12/29/2020] [Indexed: 11/29/2022] Open
Abstract
Purpose To measure bony morphologic parameters and identify their association with arthroscopic Bankart repair failure. Methods This was a retrospective comparative study. The inclusion criteria were primary arthroscopic Bankart repair, no prior shoulder surgery, traumatic cause, and had a Bankart (soft tissue and bony) lesion evident on magnetic resonance imaging (MRI). The exclusion criteria were posterior labral pathology, multidirectional instability, connective tissue disorder, rotator cuff pathology, and those who underwent concomitant shoulder procedures. Patients who had a postoperative redislocation (unstable group) were compared with matched patients who did not (stable group). Data were obtained by chart review and from preoperative MRI. Comparisons were made using the Student t test, Fisher exact test, or χ2 test. Statistical significance was defined as P < .05. Inter-rater reliability was measured between reviewers. Results A total of 45 patients experienced a postoperative dislocation and were matched to 90 patients without a postoperative dislocation. There were no differences in demographic and radiographic variables. The radius of curvature (ROC) of the glenoid was larger (shallower) in the unstable group (23.6 mm vs 22.6 mm, P = .05). The humeral head volume (HHV) trended higher in the unstable group (68.9 mL vs 62.9 mL, P = .06). The glenoid volume was not significantly different. A greater percentage of patients with a glenoid ROC of 24.5 mm or greater (62.1% vs 26.4%, P = .0003) and an HHV of 80 mm3 or greater (60.8% vs 28.9%, P = .003) experienced a redislocation compared with patients without these factors. Patients with a glenoid ROC of 24.5 mm or more and an HHV of 80 mm3 or more had greater than 4 times the odds of redislocation (odds ratio, 4.56; 95% confidence interval, 1.44-14.43; P = .0098). Strong inter-rater reliability was found for the HHV, glenoid volume, glenoid ROC, and humeral head ROC measurements (r = 0.94, r = 0.88, r = 0.89, and r = 0.95, respectively). Conclusions This study shows that large ROC (shallow) glenoids in conjunction with large humeral heads may predispose patients to failure after arthroscopic Bankart repair. Level of Evidence Level III, retrospective comparative trial.
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Affiliation(s)
- Ravi Vaswani
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Christopher Como
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Mitch Fourman
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Andrew Wilmot
- Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Camilo Borrero
- Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Dharmesh Vyas
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
| | - Albert Lin
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, U.S.A
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8
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Bodanki C, Yadoji HK, Maryada VR, Annapareddy Venkata GR. Three Dimensional Anthropometric Analysis of Glenoid Anatomy in Normal Indian Population. Indian J Orthop 2021; 55:861-868. [PMID: 34194640 PMCID: PMC8192620 DOI: 10.1007/s43465-020-00321-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Accepted: 11/27/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND Shoulder unlike any other joint has a wide range of mobility and is important in day to day activities. Different ethnic groups vary in skeletal anatomy and anthropometry. Most of our knowledge on the shoulder-anatomy, surgical technique and prosthesis designs is based on western literature. There are few studies on the Indian population. Our aim is to study the anthropometry of glenoid based on 3D CT scan of the shoulder. Our objectives are to calculate glenoid height, width, version, inclination, analyse the data for differences between male and female, compare data with similar studies in India and other countries and study the impact on shoulder arthroplasty implant size. MATERIALS AND METHODS 100 CT scans (male/female-50/50) of the Indian population are studied from our database. Glenoid measurements are calculated and analyzed. RESULTS The mean value of glenoid height is 32.9 ± 3.2 mm (27.6-41.7 mm), width 23.4 ± 2.62 mm (19.1-30.9 mm), version 0.07 ± 5.38° (- 11° to + 10.85°) and inclination 6.68 ± 5.49° (- 9.91° to + 20.75°). In our study glenoid is retroverted, superiorly inclined and height is more than width. The height and width are less than French and Americans but slightly more than the Japanese population. CONCLUSION There are significant differences in Indian glenoid measurements compared to other countries. Even the smallest size of shoulder arthroplasty glenoid component currently available in India is larger than the mean glenoid size of our study. As shoulder replacement surgeries are rising in India, we may have to bring changes in the implant design and surgical technique to suit our population.
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Affiliation(s)
- Chandrasekhar Bodanki
- Department of Arthroscopy and Shoulder Surgery, Sunshine Hospital, Secunderabad, 500003 India
- Department of Orthopaedics, Sunshine Hospital, Secunderabad, India
| | - Hari Krishna Yadoji
- Department of Arthroscopy and Shoulder Surgery, Sunshine Hospital, Secunderabad, 500003 India
- Department of Orthopaedics, Sunshine Hospital, Secunderabad, India
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9
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Mehl J, Hedgecock J, Otto A, Flaherty E, Jacoby B, DiVenere J, Cote M, Mazzocca AD. Glenoid version is associated with different labrum tear patterns in shoulder instability. J Shoulder Elbow Surg 2020; 29:1642-1649. [PMID: 32713468 DOI: 10.1016/j.jse.2020.03.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Revised: 03/07/2020] [Accepted: 03/11/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND Previous studies have evaluated glenoid version as a risk factor for anterior and posterior shoulder instability. However, the association of glenoid version with combined anterior-inferior-posterior (>180°) labrum injuries is unknown. The purpose of the present study was to investigate various parameters of glenoid morphology, including version, in >180° labral tears and to compare these values with isolated anterior and isolated posterior tears. METHODS Magnetic resonance imaging studies from a consecutive series of shoulder instability patients were reviewed by 3 independent observers to measure the parameters of glenoid morphology including superior-inferior and anterior-posterior diameter, diameter ratio, glenoid version using the glenoid vault method, and percentage of glenoid bone loss using the best-fit circle method. These parameters were compared between patients with anterior (group 1), posterior (group 2), and >180° labral tears (group 3). Interobserver reliability coefficients were calculated for all measurements assessed. RESULTS There were statistically significant differences for all group comparisons regarding the glenoid version, with group 2 having the most retroversion (19.9° ± 4.71°) followed by group 3 (14.21° ± 4.59°) and group 1 (11.24° ± 5.3°). Group 3 showed the lowest amount of glenoid bone loss; however, the group differences did not reach statistical significance. There was also no statistically significant group difference for the other measured parameters. Interobserver reliability was in the good to excellent range for all measurements. CONCLUSIONS Combined anterior-inferior-posterior labral tears are associated with an increased amount of glenoid retroversion compared with isolated anterior labral tears. Isolated posterior labral tears have the largest amount of glenoid retroversion of all tear patterns.
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Affiliation(s)
- Julian Mehl
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA; Department of Orthopaedic Sports Medicine, Technical University, Munich, Germany.
| | - Jon Hedgecock
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
| | - Alexander Otto
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA; Department of Orthopaedic Sports Medicine, Technical University, Munich, Germany; Department of Trauma, Orthopaedic, Plastic and Hand Surgery, University Hospital of Augsburg, Augsburg, Germany
| | - Eilish Flaherty
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
| | - Brigitte Jacoby
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
| | - Jessica DiVenere
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
| | - Mark Cote
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
| | - Augustus D Mazzocca
- Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT, USA
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Abstract
BACKGROUND Orthopaedic studies have reported the prevalence of injuries and outcomes after treatment in men and women patients, and although these differences have been recognized, few studies have evaluated for gender-specific injury patterns, disease progression, and treatment outcomes. A thorough understanding of gender-related differences is important to better individualize treatment and improve outcomes. QUESTIONS/PURPOSES In this study, we sought (1) to determine the proportion of studies published in six orthopaedic journals that provided sex- or gender-specific analyses in 2016 and whether a difference was found in outcomes between men and women and (2) to evaluate whether this proportion varied across several orthopaedic subspecialty journals or between general orthopaedic journals and subspecialty journals. METHODS Six leading orthopaedic surgery journals were selected for review, including two general orthopaedic journals (Journal of Bone and Joint Surgery and Clinical Orthopaedics and Related Research®) and four subspecialty journals (American Journal of Sports Medicine, Journal of Arthroplasty, Journal of Shoulder and Elbow Surgery, and Spine). Journal issues published in the even-numbered months of 2016 were reviewed for clinical randomized controlled, cohort, and case-control studies in which women were a part of the study population. A total of 712 studies evaluating 24,607,597 patients met the criteria and were included in our review of publications from 2016. The selected studies were stratified based on whether gender was a variable in a multifactorial statistical model. Outcomes of interest included the proportion of patients who were women and the presence or absence of a gender-specific analysis. These endpoints were compared between journals. RESULTS Overall, 55% (13,565,773 of 24,607,597) of patients analyzed in these studies were women. Only 34% (241 of 712) of the studies published in 2016 included gender as variable in a multifactorial statistical model. Of these, 39% (93 of 241) demonstrated a difference in the outcomes between patients who were men and women. The Journal of Arthroplasty had the greatest percentage of patients who were women (60%, 9,251,068 of 15,557,187) and the American Journal of Sports Medicine had the lowest (44%, 1,027,857 of 2,357,139; p < 0.001). Orthopaedic subspecialty journals tended to include a greater percentage of women (54%) than did general orthopaedic journals (50%; p = 0.04). CONCLUSION Currently, it is unclear what percentage of published orthopaedic studies should include a gender-specific analysis. In the current study, more than one-third of publications that performed a gender-specific analysis demonstrated a difference in outcomes between men and women, thereby emphasizing the need to determine when such an analysis is warranted. CLINICAL RELEVANCE Future studies should aim to determine when a gender-specific analysis is necessary to improve the management of orthopaedic injuries in men and women. It is important for investigators at the individual-study level to look for every opportunity to ensure that both men's and women's health needs are met by performing appropriate by-sex and by-gender analyses, but not to perform them when they are unnecessary or inappropriate.
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Qualitative and quantitative analysis of glenoid bone stock and glenoid version: inter-reader analysis and correlation with rotator cuff tendinopathy and atrophy in patients with shoulder osteoarthritis. Skeletal Radiol 2020; 49:985-993. [PMID: 31955231 DOI: 10.1007/s00256-020-03377-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 01/07/2020] [Accepted: 01/09/2020] [Indexed: 02/02/2023]
Abstract
PURPOSE Glenoid bone stock and morphology and rotator cuff muscle quality and tendon integrity affect the outcome of total shoulder arthroplasty. We hypothesized that glenoid bone loss correlates with rotator cuff muscle fatty infiltration (FI), tendinopathy, and atrophy. DESIGN Forty-three 3D CT scans and MRIs of 43 patients (mean age 62 years; SD 13 years; range 22-77 years) referred for primary shoulder pain were evaluated. Measurements of glenoid bone stock, version, and posterior humeral subluxation index (HSI) were assessed on an axial CT image reconstructed in the true scapular plane. Measurements utilized the Friedman line to approximate the pre-pathologic surface. Glenoid morphology was assigned by modified Walch classification. Rotator cuff FI, atrophy, and tendon integrity were assessed on corresponding MRIs. RESULTS There was a very strong negative correlation between increasing glenoid version and HSI (r = - 0.908; p < 0.0001). There was a moderately negative correlation between anterior bone loss and HSI (r = - 0.562; p < 0.0001) and a moderately positive correlation between posterior bone loss and HSI (r = 0.555; p < 0.0001). Subscapularis muscle FI correlated moderately with increased anterior and central bone loss and increased humeral head medialization (r = 0.512, p = 0.0294; r = 0.479, p = 0.033; r = 0.494, p = 0.0294; respectively). Inter-observer reliability (intra-class correlation coefficient [ICC] and kappa) was good to excellent for all measurements and grading. CONCLUSION Glenoid anteversion and anterior and posterior bone loss are associated with varying HSI. Subscapularis muscle FI, not tendon integrity, correlates to anterior and central glenoid erosion. The study adds evidence that neither rotator cuff tendinopathy nor muscle atrophy exhibits a significant relationship to HSI.
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Siebert MJ, Chalian M, Sharifi A, Pezeshk P, Xi Y, Lawson P, Chhabra A. Correction to: Qualitative and quantitative analysis of glenoid bone stock and glenoid version: inter-reader analysis and correlation with rotator cuff tendinopathy and atrophy in patients with shoulder osteoarthritis. Skeletal Radiol 2020; 49:995-1003. [PMID: 32086541 DOI: 10.1007/s00256-020-03386-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Purpose Glenoid bone stock and morphology and rotator cuff muscle quality and tendon integrity affect the outcome of total shoulder arthroplasty. We hypothesized that glenoid bone loss correlates with rotator cuff muscle fatty infiltration (FI), tendinopathy, and atrophy.Design Forty-three 3-D CT scans and MRIs of 43 patients (mean age 62 years; SD 13 years; range 22-77 years) referred for primary shoulder pain were evaluated. Measurements of glenoid bone stock, version, and posterior humeral subluxation index (HSI) were assessed on an axial CT image reconstructed in the true scapular plane. Measurements utilized the Friedman line to approximate the pre-pathologic surface. Glenoid morphology was assigned by modified Walch classification. Rotator cuff FI, atrophy, and tendon integrity were assessed on corresponding MRIs.Results There was a very strong negative correlation between increasing glenoid version and HSI (r = - 0.908; p < 0.0001). There was a moderately negative correlation between anterior bone loss and HSI (r = - 0.562; p < 0.0001) and a moderately positive correlation between posterior bone loss and HSI (r = 0.555; p < 0.0001). Subscapularis muscle FI correlated moderately with increased anterior and central bone loss and increased humeral head medialization (r = 0.512, p = 0.0294; r = 0.479, p = 0.033; r = 0.494, p = 0.0294, respectively). Inter-observer reliability (intra-class correlation coefficient [ICC] and kappa) was good to excellent for all measurements and grading.Conclusion Glenoid anteversion and anterior and posterior bone loss are associated with varying HSI. Subscapularis muscle FI, not tendon integrity, correlates to anterior and central glenoid erosion. The study adds evidence that neither rotator cuff tendinopathy nor muscle atrophy exhibits a significant relationship to HSI.
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Affiliation(s)
| | - Majid Chalian
- Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | | | - Parham Pezeshk
- Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Yin Xi
- Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Parker Lawson
- Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Avneesh Chhabra
- Radiology, UT Southwestern Medical Center, Dallas, TX, USA. .,Orthopedics, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, 75390, USA. .,Radiology and Orthopedic Surgery, UT Southwestern Medical Center, Dallas, TX, USA. .,Johns Hopkins University, Baltimore, MD, USA. .,Walton Center of Neurosciences, Liverpool, UK.
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Assessment of the Glenoid Morphology Based on Demographic Data in the Turkish Population. BIOMED RESEARCH INTERNATIONAL 2020; 2020:5736136. [PMID: 32104697 PMCID: PMC7035523 DOI: 10.1155/2020/5736136] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 01/11/2020] [Indexed: 11/18/2022]
Abstract
Purpose In this study, our aim was to evaluate the glenoid version, height, and width measurements based on gender, side, age, height, and hand dominance in the Turkish population using computed tomography (CT) images. Methods In our study, CT images of 140 patients (62 females and 78 males; mean age: 39.6 years) who had no shoulder complaints were evaluated retrospectively. Glenoid version (GV), AP diameter (width), and SI diameter (height) on both shoulders were measured on the CT images. Correlations between patient gender, side, age, height, and hand dominance and the GV and size were evaluated. Results The right shoulder had a mean GV of −0.93 ± 7.80 degrees and the left shoulder had a GV of −0.88 ± 6.63 degrees (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder (p > 0.05). The mean AP diameter of the glenoid was 26.57 ± 3.02 mm in the right shoulder and 26.33 ± 3.01 mm in the left shoulder ( Conclusion Hand dominance had an effect on the glenoid version, while patient gender, age, and height had an effect on the glenoid size. The glenoid width in the Turkish population was similar to that of the European and American populations, and the glenoid height was similar to that of the Asian population. Our GV values were similar to those of the Asian population and more anteverted compared to the Western population. We believe that our findings will be useful in preoperative planning and in the production of implants for our population.
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Jacxsens M, Elhabian SY, Brady SE, Chalmers PN, Tashjian RZ, Henninger HB. Coracoacromial morphology: a contributor to recurrent traumatic anterior glenohumeral instability? J Shoulder Elbow Surg 2019; 28:1316-1325.e1. [PMID: 30928394 PMCID: PMC6591074 DOI: 10.1016/j.jse.2019.01.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/02/2019] [Accepted: 01/06/2019] [Indexed: 02/01/2023]
Abstract
BACKGROUND Although scapular morphology contributes to glenohumeral osteoarthritis and rotator cuff disease, its role in traumatic glenohumeral instability remains unknown. We hypothesized that coracoacromial and glenoid morphology would differ between healthy subjects and patients with recurrent traumatic anterior shoulder instability. METHODS Computed tomography scans of 31 cadaveric control scapulae and 54 scapulae of patients with recurrent traumatic anterior shoulder instability and Hill-Sachs lesions were 3-dimensionally reconstructed. Statistical shape modeling identified the modes of variation between the scapulae of both groups. Corresponding measurements quantified these modes in relation to the glenoid center (linear offset measures), defined by the best-fit circle of the inferior glenoid, or the glenoid center plane (angles), which bisects the glenoid longitudinally. Distances were normalized for glenoid size. RESULTS Compared with controls, the unstable coracoids were shorter (P = .004), with a more superior and medial offset of the tip (mean difference [MD], 7 and 3 mm, respectively; P < .001) and an origin closer to the 12-o'clock position (MD, 6°; P < .001). The unstable scapular spines originated closer to the 9-o'clock position (MD, 4°; P = .012), and the unstable acromions were more vertically oriented (MD, 6°; P < .001). The unstable glenoids had an increased height-width index (MD, 0.04; P = .021), had a flatter anterior-posterior radius of curvature (MD, 77 mm; P < .001), and were more anteriorly tilted (MD, 5°; P = .005). CONCLUSIONS Coracoacromial and glenoid anatomy differs between individuals with and without recurrent traumatic anterior shoulder instability. This pathologic anatomy is not addressed by current soft-tissue stabilization procedures and may contribute to instability recurrence.
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Affiliation(s)
- Matthijs Jacxsens
- Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA; Department of Orthopaedics and Traumatology, Kantonsspital St. Gallen, St. Gallen, Switzerland
| | - Shireen Y Elhabian
- Scientific Computing and Imaging Institute, School of Computing, University of Utah, Salt Lake City, UT, USA
| | - Sarah E Brady
- Department of Bioengineering, University of Utah, Salt Lake City, UT, USA
| | - Peter N Chalmers
- Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA
| | - Robert Z Tashjian
- Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA
| | - Heath B Henninger
- Department of Orthopaedics, University of Utah, Salt Lake City, UT, USA; Scientific Computing and Imaging Institute, School of Computing, University of Utah, Salt Lake City, UT, USA; Department of Bioengineering, University of Utah, Salt Lake City, UT, USA.
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Risk factors for anterior shoulder instability: a matched case-control study. J Shoulder Elbow Surg 2019; 28:869-874. [PMID: 30509611 DOI: 10.1016/j.jse.2018.09.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 09/09/2018] [Accepted: 09/13/2018] [Indexed: 02/01/2023]
Abstract
BACKGROUND Anatomic skeletal features of the shoulder play important roles in anterior shoulder dislocation. However, studies on the effect of the humeral structure are few. This case-control study aimed to analyze the risk factors of anterior shoulder instability, including glenoid and humeral factors. METHODS Anterior shoulder instability was found in 64 of 10,035 individuals who underwent magnetic resonance imaging. Propensity score matching was used to select controls matched for age, sex, height, and weight. We analyzed the glenoid and humeral structural data using conditional logistic regression analysis and identified cutoff points using receiver operating characteristic curve analysis. RESULTS Significant differences were found between the control and dislocation groups in the depth-to-width ratio (0.119 ± 0.034 vs. 0.105 ± 0.037, P = .021), height-to-width ratio (1.51 ± 0.13 vs. 1.67 ± 0.16, P < .001), humeral head diameter-to-glenoid fossa diameter ratio (1.56 ± 0.11 vs. 1.64 ± 0.20, P < .001), and humeral containing angle (67.3° ± 5.9° vs. 60.4° ± 5.9°, P < .001). The humeral containing angle (odds ratio, 0.95; P = .024) and the glenoid height-to-width ratio (odds ratio, 7.88; P = .002), adjusted for the depth-to-width ratio and diameter ratio, were associated with anterior shoulder instability. The cutoff point for the humeral containing angle was 64° and for the height-to-width ratio was 1.60. CONCLUSIONS This study revealed significant risk factors for shoulder instability in the Chinese Han population. The humeral containing angle and the glenoid height-to-width ratio were risk factors for anterior shoulder instability.
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Lee SH, Lim KH, Kim JW. Risk Factors for Recurrence of Anterior-Inferior Instability of the Shoulder After Arthroscopic Bankart Repair in Patients Younger Than 30 Years. Arthroscopy 2018; 34:2530-2536. [PMID: 30173793 DOI: 10.1016/j.arthro.2018.03.032] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 03/17/2018] [Accepted: 03/19/2018] [Indexed: 02/02/2023]
Abstract
PURPOSE To identify the risk factors for recurrent instability after arthroscopic Bankart repair and evaluate the recurrence rate and functional outcomes. METHODS A retrospective review was performed of patients with anterior-inferior shoulder instability who underwent arthroscopic Bankart repair between 2008 and 2014. Patients below 30 years of age who were available for follow-up at least for 2 years were sorted into 2 groups according to the presence of recurrent instability. Furthermore, statistical analysis by binary logistic regression analysis included the significance of various risk factors including gender, demographic factors, number of preoperative dislocations, time interval between the first dislocation and the surgery (shorter than 6 months or not), generalized hyperlaxity, concomitant injury, bony Bankart, and off-track lesion. The functional outcomes were assessed with the Rowe and Walch-Duplay scores. RESULTS A total of 170 shoulders were included (without-recurrence group: 138, recurrent group: 32). The overall postoperative recurrent instability rate was 18.8%. SLAP repair, interval closure, and capsular plication were performed when necessary. However, these additional procedures were not influenced by recurrence (P = .37). The 2 groups showed significant differences in the number of preoperative dislocations (P = .048; adjusted odds ratio [OR] 2-5 times, 6.41; more than 5 times, 8.77), time interval between the first dislocation and surgery (P = .003, adjusted OR 5.62), and off-track Hill-Sachs lesion (P = .04, adjusted OR 4.31). There was significant improvement in the mean Rowe and Walch-Duplay scores at 2 years postoperatively (P < .001 in both cases), but the mean scores were lower in the group with recurrence than in the group without (P = .021 and .014, respectively). CONCLUSIONS The overall results suggest that surgery within 6 months of the first dislocation should be considered, with meticulous attention in patients with a high number of preoperative dislocations or off-track Hill-Sachs lesions. LEVEL OF EVIDENCE Level III, retrospective case-control study.
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Affiliation(s)
- Sung Hyun Lee
- Department of Orthopedic Surgery, Wonkwang University Hospital, Iksan, Republic of Korea
| | - Kyeong Hoon Lim
- Department of Orthopedic Surgery, Wonkwang University Hospital, Iksan, Republic of Korea
| | - Jeong Woo Kim
- Department of Orthopedic Surgery, Wonkwang University Hospital, Iksan, Republic of Korea.
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Abstract
PURPOSE OF REVIEW The purpose of this review is to outline the natural history and best clinical practices for nonoperative management of anterior shoulder instability. RECENT FINDINGS Recent studies continue to demonstrate a role for nonoperative treatment in the successful long-term management of anterior glenohumeral instability. The success of different positions of shoulder immobilization is reviewed as well. There are specific patients who may be best treated with nonoperative means after anterior glenohumeral instability. There are also patients who are not good nonoperative candidates based on a number of factors that are outlined in this review. There continues to be no definitive literature regarding the return to play of in-season athletes. Successful management requires a thorough understanding of the epidemiology, pathoanatomy, history, physical examination, diagnostic imaging modalities, and natural history of operative and nonoperative treatment.
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