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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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The Muscle Cross-sectional Area on MRI of the Shoulder Can Predict Muscle Volume: An MRI Study in Cadavers. Clin Orthop Relat Res 2020; 478:871-883. [PMID: 31725479 PMCID: PMC7282568 DOI: 10.1097/corr.0000000000001044] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Muscle volume is important in shoulder function. It can be used to estimate shoulder muscle balance in health, pathology, and repair and is indicative of strength based on muscle size. Although prior studies have shown that muscle area on two-dimensional (2-D) images correlates with three-dimensional (3-D) muscle volume, they have not provided equations to predict muscle volume from imaging nor validation of the measurements. QUESTIONS/PURPOSES We wished to create an algorithm that quickly, accurately, and reliably estimates the volume of the shoulder muscles using cross-sectional area on MR images with low error. Specifically, we wished to (1) determine which MR imaging planes provide the highest correlation between shoulder muscle cross-sectional area and volume; (2) derive equations to predict muscle volume from cross-sectional area and validate their predictive capability; and (3) quantify the reliability of muscle cross-sectional area measurement. METHODS Three-dimensional MRI was performed on 10 cadaver shoulders, with sample size chosen for comparison to prior studies of shoulder muscle volume and in consideration of the cost of comprehensive analysis, followed by dissection for muscle volume measurement via water displacement. From each MR series, 3-D models of the rotator cuff and deltoid muscles were generated, and 2-D slices of these muscle models were selected at defined anatomic landmarks. Linear regression equations were generated to predict muscle volume at the plane(s) with the highest correlation between volume and area and for planes identified in prior studies of muscle volume and area. Volume predictions from MR scans of six different cadaver shoulders were also made, after which they were dissected to quantify muscle volume. This validation population allowed the calculation of the predictive error compared with actual muscle volume. Finally, reliability of measuring muscle areas on MR images was calculated using intraclass correlation coefficients for inter-rater reliability, as measured between two observers at a single time point. RESULTS The rotator cuff planes with the highest correlation between volume and area were the sum of the glenoid face and the midpoint of the scapula, and for the deltoid, it was the transverse plane at the top of the greater tuberosity. Water and digital muscle volumes were highly correlated (r ≥ 0.993, error < 4%), and muscle areas correlated highly with volumes (r ≥ 0.992, error < 2%). All correlations had p < 0.001. Muscle volume was predicted with low mean error (< 10%). All intraclass correlation coefficients were > 0.925, suggesting high inter-rater reliability in determining muscle areas from MR images. CONCLUSION Deltoid and rotator cuff muscle cross-sectional areas can be reliably measured on MRI and predict muscle volumes with low error. CLINICAL RELEVANCE Using simple linear equations, 2-D muscle area measurements from common clinical image analysis software can be used to estimate 3-D muscle volumes from MR image data. Future studies should determine if these muscle volume estimations can be used in the evaluation of patient function, changes in shoulder health, and in populations with muscle atrophy. Additionally, these muscle volume estimation techniques can be used as inputs to musculoskeletal models examining kinetics and kinematics of humans that rely on subject-specific muscle architecture.
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Comparison of Clinical Outcomes After Anatomic Total Shoulder Arthroplasty and Reverse Shoulder Arthroplasty in Patients 70 Years and Older With Glenohumeral Osteoarthritis and an Intact Rotator Cuff. J Am Acad Orthop Surg 2020; 28:e222-e229. [PMID: 31356423 DOI: 10.5435/jaaos-d-19-00166] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
INTRODUCTION As the indications for reverse shoulder arthroplasty (RSA) expand beyond traditional cuff tear arthropathy, the role of RSA in elderly patients with glenohumeral arthritis and an intact rotator cuff remains unclear. METHODS This retrospective cohort study included 135 patients who underwent RSA or total shoulder arthroplasty (TSA) at a single tertiary orthopedic center between 2005 and 2015 and were 70 years of age or older at the time of surgery. All patients had preoperative advanced imaging confirming an intact rotator cuff but active forward elevation less than 90°. Complications, reoperations, and patient survival were recorded from the medical record. Patient-reported outcomes (Pain visual analog scale, Satisfaction Score, American Shoulder and Elbow Surgeons [ASES], and Western Ontario Osteoarthritis of the Shoulder [WOOS]) and patient-reported range of motion were collected at a minimum of 2 years after procedure. RESULTS There was no significant difference in complication rate or revision surgery rate between patients undergoing TSA and RSA (complications 13.7% versus 12.1%, P = 0.810; reoperations 6.9% vs 3.0%, P = 0.418). There were no differences in patient-reported outcome measures between the two groups. Mean pain visual analog scale scores were low in both groups (0.72, SD 1.93 for TSA and 0.31, SD 0.72 for RSA). Satisfaction scores were high (86.1, SD 23.3 for TSA and 91.8, SD 9.0 for RSA, P = 0.286). Mean ASES and WOOS scores were also high in both groups (86 [SD 15.6] for TSA and 83 [SD 12.6] for RSA for ASES [P = 0.400] and 86 [SD 18.3] for TSA and 89 [SD 10.2] for RSA for WOOS [P = 0.400]). One hundred percent of subjects following RSA and 98% of subjects following TSA rated their forward elevation as full or nearly full (>135°) (P = 0.516). DISCUSSION Given the good clinical outcomes after both TSA and RSA, there may be an increased role for RSA in this elderly cohort to provide effective treatment of glenohumeral osteoarthritis. LEVEL OF EVIDENCE Level III, retrospective comparative study.
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Holt AM, Throckmorton TW. Reverse Shoulder Arthroplasty for B2 Glenoid Deformity. J Shoulder Elb Arthroplast 2019; 3:2471549219897661. [PMID: 34497958 PMCID: PMC8282141 DOI: 10.1177/2471549219897661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 09/27/2019] [Accepted: 12/08/2019] [Indexed: 11/23/2022] Open
Abstract
In shoulder osteoarthritis, the B2 glenoid presents challenges in treatment
because of the excessive retroversion and posterior deficiency of the glenoid.
Correction of retroversion and maintenance of a stable joint line with
well-fixed implants are essential for the successful treatment of this deformity
with arthroplasty. Reverse shoulder arthroplasty offers several key advantages
in achieving this goal, including favorable biomechanics, a well-fixed
baseplate, and proven success in other applications. Techniques such as
eccentric reaming, bone grafting, and baseplate augmentation allow surgeons to
tailor treatment to the patient’s altered anatomy. Eccentric reaming is favored
for correction of small defects or mild version anomalies. Current trends favor
bone grafting for larger corrections, though augmented components have shown
early promise with the potential for expanded use. With overall promising
results reported in the literature, reverse shoulder arthroplasty is a useful
tool for treating older patients with B2 glenoid deformities.
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Affiliation(s)
- Andrew M Holt
- Campbell Clinic, Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee, Memphis, Tennesse
| | - Thomas W Throckmorton
- Campbell Clinic, Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee, Memphis, Tennesse
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Normal and Pathoanatomy of the Arthritic Shoulder: Considerations for Shoulder Arthroplasty. J Am Acad Orthop Surg 2019; 27:e1068-e1076. [PMID: 31206438 DOI: 10.5435/jaaos-d-18-00414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The glenohumeral joint is a highly mobile, complex articulation that relies not only on the bony support between the humeral head and glenoid but also on appropriate balance and tension of the surrounding soft-tissue structures. Recreating the normal anatomic relationships is a basic premise in joint arthroplasty, which can be challenging in shoulder arthroplasty, as the normal glenohumeral anatomy has considerable variation from patient to patient. Also, as the anatomy of the glenohumeral joint becomes distorted with advanced shoulder pathology, it becomes a challenge to return the shoulder to its premorbid anatomic state. Failure to restore normal anatomic parameters after shoulder arthroplasty has been shown to have deleterious effects on postoperative function and implant survival. As the recognition of this has grown, shoulder prostheses have evolved to allow for considerable more variation in an attempt to recreate patient-specific anatomy. However, understanding the progression of shoulder pathology to better predict the patient's premorbid anatomy remains limited. A thorough understanding of the premorbid and pathologic anatomy of the glenohumeral joint will aid in preoperative planning and intraoperative execution and lead to a more predictable reconstruction of the shoulder, which is critical for a successful outcome after shoulder arthroplasty.
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Prearthroplasty glenohumeral pathoanatomy and its relationship to patient's sex, age, diagnosis, and self-assessed shoulder comfort and function. J Shoulder Elbow Surg 2019; 28:2290-2300. [PMID: 31311749 DOI: 10.1016/j.jse.2019.04.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/02/2019] [Accepted: 04/15/2019] [Indexed: 02/01/2023]
Abstract
BACKGROUND There is great current interest in characterizing the prearthroplasty glenohumeral pathoanatomy because of its role in guiding surgical technique and its possible effects on arthroplasty outcome. METHODS We examined 544 patients within 6 weeks before arthroplasty with the goals of characterizing the following: demographic and radiographic characteristics; relationships of the radiographic pathoanatomy to the patient's age, sex, and diagnosis; inter-relationships among glenoid type, glenoid version, and amount of decentering of the humeral head on the glenoid; and relationships of the pathoanatomy to the patient's self-assessed comfort and function. RESULTS Male patients had a higher frequency of B2 glenoids and a lower frequency of A2 glenoids. The arthritic shoulders of men were more retroverted and had greater amounts of posterior decentering. Patients with types A1 and C glenoids were younger than those with other glenoid types. Shoulders with osteoarthritis were more likely to be type B2 and to be retroverted. Types B2 and C had the greatest degree of retroversion, whereas types B1 and B2 had the greatest amounts of posterior decentering. Shoulders with glenoid types B1 and B2 and those with more decentering did not have worse self-assessed shoulder comfort and function. CONCLUSIONS Glenohumeral pathoanatomy was found to have previously unreported relationships to the patient's sex, age, and diagnosis. Contrary to what might have been expected, more advanced glenohumeral pathoanatomy (ie, type B glenoids, greater retroversion, greater decentering) was not associated with worse self-assessed shoulder comfort and function.
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Aleem AW, Chalmers PN, Bechtold D, Khan AZ, Tashjian RZ, Keener JD. Association Between Rotator Cuff Muscle Size and Glenoid Deformity in Primary Glenohumeral Osteoarthritis. J Bone Joint Surg Am 2019; 101:1912-1920. [PMID: 31567672 DOI: 10.2106/jbjs.19.00086] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Although glenoid morphology has been associated with fatty infiltration of the rotator cuff in arthritic shoulders, the association of rotator cuff muscle area with specific patterns of glenoid wear has not been studied. The purpose of our study was to assess the associations of glenoid deformity in primary glenohumeral osteoarthritis and rotator cuff muscle area. METHODS A retrospective study of 370 computed tomographic (CT) scans of osteoarthritic shoulders was performed. Glenoid deformity according to the modified Walch classification was determined, and retroversion, inclination, and humeral-head subluxation were calculated using automated 3-dimensional software. Rotator cuff muscle area was measured on sagittal CT scan reconstructions. A ratio of the area of the posterior rotator cuff muscles to the subscapularis was calculated to approximate axial plane potential force imbalance. Univariate and multivariate analyses to determine associations with glenoid bone deformity and rotator cuff measurements were performed. RESULTS Patient age and sex were significantly related to cuff muscle area across glenoid types. Multivariate analysis did not find significant differences in individual rotator cuff cross-sectional areas across glenoid types, with the exception of a larger supraspinatus area in Type-B2 glenoids compared with Type-A glenoids (odds ratio [OR], 1.5; p = 0.04). An increased ratio of the posterior cuff area to the subscapularis area was associated with increased odds of a Type-B2 deformity (OR, 1.3; p = 0.002). Similarly, an increase in this ratio was significantly associated with increased glenoid retroversion (beta = 0.92; p = 0.01) and humeral-head subluxation (beta = 1.48; p = 0.001). Within the Type-B glenoids, only posterior humeral subluxation was related to the ratio of the posterior cuff to the subscapularis (beta = 1.15; p = 0.001). CONCLUSIONS Age and sex are significantly associated with cuff muscle area in arthritic shoulders. Asymmetric glenoid wear and humeral-head subluxation in osteoarthritis are associated with asymmetric atrophy within the rotator cuff transverse plane. Increased posterior rotator cuff muscle area compared with anterior rotator cuff muscle area is associated with greater posterior glenoid wear and subluxation. It is unclear if the results are causative or associative; further research is required to clarify the relationship. LEVEL OF EVIDENCE Prognostic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Alexander W Aleem
- Department of Orthopaedic Surgery, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | - Peter N Chalmers
- Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City, Utah
| | - Daniel Bechtold
- Department of Orthopaedic Surgery, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | - Adam Z Khan
- Department of Orthopaedic Surgery, Washington University in St. Louis School of Medicine, St. Louis, Missouri
| | - Robert Z Tashjian
- Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City, Utah
| | - Jay D Keener
- Department of Orthopaedic Surgery, Washington University in St. Louis School of Medicine, St. Louis, Missouri
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Friedman LG, Garrigues GE. Anatomic Augmented Glenoid Implants for the Management of the B2 Glenoid. J Shoulder Elb Arthroplast 2019; 3:2471549219870350. [PMID: 34497956 PMCID: PMC8282160 DOI: 10.1177/2471549219870350] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/24/2019] [Accepted: 07/26/2019] [Indexed: 11/16/2022] Open
Abstract
The B2 glenoid is defined by Walch et al. as a glenoid that is biconcave with posterior erosion accompanied by posterior humeral head subluxation. This creates unique challenges for the treating orthopedic surgeon. Bone loss, excessive retroversion, and posterior subluxation make anatomic shoulder arthroplasty in this setting fraught with increased complications, including instability, glenoid component loosening, and poor clinical outcomes. Many techniques have been devised to treat the arthritic shoulder with a B2 glenoid, including hemiarthroplasty, total shoulder arthroplasty using eccentric reaming, bone grafting and custom implantation, and reverse total shoulder arthroplasty. In this review, we will focus on anatomic total shoulder arthroplasty using augmented glenoid implants to treat the B2 glenoid. Indications, clinical results, and basic science analyses of augmented anatomic glenoids are also discussed.
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Affiliation(s)
- Lisa Gm Friedman
- Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, IL, USA
| | - Grant E Garrigues
- Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, IL, USA
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The Walch type B humerus: glenoid retroversion is associated with torsional differences in the humerus. J Shoulder Elbow Surg 2019; 28:1801-1808. [PMID: 31043349 DOI: 10.1016/j.jse.2019.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 02/01/2019] [Accepted: 02/15/2019] [Indexed: 02/01/2023]
Abstract
BACKGROUND The Walch type B glenoid has the hallmark features of retroversion, joint subluxation, and bony erosion. Although the type B glenoid has been well described, the morphology of the corresponding type B humerus is poorly understood. As such, the aim of this imaging-based anthropometric study was to investigate humeral torsion in Walch type B shoulders. METHODS Three-dimensional models of the full-length humerus were generated from computed tomography data for the Walch type B group (n = 59) and for a control group of normal nonarthritic shoulders (n = 59). An anatomic humeral head-neck plane was created and used to determine humeral torsion relative to the epicondylar axis. Measurements were repeated, and intraclass correlation coefficients were calculated. RESULTS The type B humeri had significantly (P < .001) less retrotorsion (14° ± 9°) than the control group (36° ± 12°) relative to the epicondylar axis. Male and female individuals within the control group showed statistically significant differences in humeral torsion (P = .043), which were not found in the type B group. Inter-rater reliability showed excellent agreement for humeral torsion (intraclass correlation coefficient, 0.962). A subgroup analysis between Walch type B2 and B3 shoulders showed no significant differences in any of the humeral or glenoid parameters. CONCLUSION The Walch type B humerus has significantly less retrotorsion than non-osteoarthritic shoulders. At present, it is unknown whether the altered humeral retrotorsion is a cause or effect of the type B glenoid. In addition, it is unknown whether surgeons should be reconstructing type B2 humeral component version to pathologic torsion or to nonpathologic population means to optimize arthroplasty survivorship.
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Mahylis JM, Entezari V, Jun BJ, Iannotti JP, Ricchetti ET. Imaging of the B2 Glenoid: An Assessment of Glenoid Wear. J Shoulder Elb Arthroplast 2019; 3:2471549219861811. [PMID: 34497954 PMCID: PMC8282138 DOI: 10.1177/2471549219861811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 05/19/2019] [Accepted: 06/16/2019] [Indexed: 11/20/2022] Open
Abstract
Background Glenohumeral osteoarthritis (OA) carries a spectrum of morphology and wear patterns of the glenoid surface exemplified by complex patterns such as glenoid biconcavity and acquired retroversion seen in the B2 glenoid. Multiple imaging methods are available for evaluation of the complex glenoid structure seen in B2 glenoids. The purpose of this article is to review imaging assessment of the type B2 glenoid. Methods The current literature on imaging of the B2 glenoid was reviewed to describe the unique anatomy of this OA variant and how to appropriately assess its characteristics. Results Plain radiographs, magnetic resonance imaging, and standard 2-dimensional computed tomography (CT) have all shown acceptable assessments of arthritic glenoids but lack the detailed and highly accurate evaluation of bone loss and retroversion seen with 3-dimensional CT. Conclusion Accurate preoperative identification of complex B2 pathology on imaging remains essential in planning and achieving precise implant placement at the time of shoulder arthroplasty.
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Affiliation(s)
- Jared M Mahylis
- Department of Orthopedic Surgery, Franciscan Health, Olympia Fields, Illinois
| | - Vahid Entezari
- Department of Orthopaedic Surgery, Orthopaedic and Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | - Bong-Jae Jun
- Department of Orthopaedic Surgery, Orthopaedic and Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | - Joseph P Iannotti
- Department of Orthopaedic Surgery, Orthopaedic and Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | - Eric T Ricchetti
- Department of Orthopaedic Surgery, Orthopaedic and Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
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Cameron KL, Tennent DJ, Sturdivant RX, Posner MA, Peck KY, Campbell SE, Westrick RB, Owens BD. Increased Glenoid Retroversion Is Associated With Increased Rotator Cuff Strength in the Shoulder. Am J Sports Med 2019; 47:1893-1900. [PMID: 31172807 DOI: 10.1177/0363546519853591] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND The rotator cuff muscles are critical secondary stabilizers in the shoulder. Increased glenoid retroversion and rotator cuff strength have been associated with the risk of posterior shoulder instability; however, the effect of increased glenoid retroversion on rotator cuff strength remains unclear. PURPOSE/HYPOTHESIS The purpose was to examine the association between glenoid version and rotator cuff strength in the shoulder in a young and healthy population with no history of shoulder instability. The hypothesis was that increased glenoid retroversion would be associated with increases in rotator cuff muscle strength. STUDY DESIGN Cross-sectional study; Level of evidence, 3. METHODS A prospective cohort study was conducted over a 4-year period within a high-risk population to identify the risk factors for shoulder instability. Analyzed participants included 574 freshmen entering a United States service academy. Baseline data collected upon entry into the study included magnetic resonance imaging measurements of glenoid version. Rotator cuff strength was also assessed at baseline using a handheld dynamometer. Internal and external rotation strength were assessed with the glenohumeral joint positioned in neutral and in 45° of abduction. The current study represents an analysis of the baseline data from this cohort. RESULTS The mean age, height, and weight of participants was 18.77 ± 0.97 years, 176.81 ± 8.48 cm, and 73.80 ± 12.45 kg, respectively. The mean glenoid version at baseline was 7.79°± 4.85° of retroversion. Univariate linear regression analyses demonstrated that increased glenoid retroversion was associated with increased internal and external rotation strength of the rotator cuff in neutral and 45° of abduction (P < .001). Similar results were observed in multivariable models controlling for important confounding variables. CONCLUSION The results of this study demonstrate that as glenoid retroversion increases, internal and external rotation strength of the rotator cuff also increase in a young and healthy athletic population. These compensatory changes may contribute to increased glenohumeral dynamic stability in the presence of worse static stability with increasing retroversion.
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Affiliation(s)
- Kenneth L Cameron
- Department of Orthopedic Surgery, Keller Army Community Hospital, United States Military Academy, West Point, New York, USA
| | - David J Tennent
- Department of Orthopedic Surgery, Keller Army Community Hospital, United States Military Academy, West Point, New York, USA
| | - Rodney X Sturdivant
- Department of Mathematics, Physics, and Statistics, Azusa Pacific University, Azusa, California, USA
| | - Matthew A Posner
- Department of Orthopedic Surgery, Keller Army Community Hospital, United States Military Academy, West Point, New York, USA
| | - Karen Y Peck
- Department of Orthopedic Surgery, Keller Army Community Hospital, United States Military Academy, West Point, New York, USA
| | - Scot E Campbell
- San Antonio Military Medical Center, San Antonio, Texas, USA
| | - Richard B Westrick
- Military Performance Division, US Army Research Institute of Environmental Medicine, Natick, Massachusetts, USA.,MGH Institute of Health Professions, Boston, Massachusetts, USA
| | - Brett D Owens
- Warren Alpert Medical School, Brown University, Providence, Rhode Island, USA
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Ho JC, Amini MH, Entezari V, Jun BJ, Alolabi B, Ricchetti ET, Iannotti JP. Clinical and Radiographic Outcomes of a Posteriorly Augmented Glenoid Component in Anatomic Total Shoulder Arthroplasty for Primary Osteoarthritis with Posterior Glenoid Bone Loss. J Bone Joint Surg Am 2018; 100:1934-1948. [PMID: 30480598 DOI: 10.2106/jbjs.17.01282] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND The primary objectives of this study were to evaluate the ability of a posteriorly stepped augmented glenoid component, used in patients with primary glenohumeral osteoarthritis with B2 or B3 glenoid morphology, to correct preoperative retroversion and humeral head subluxation and to identify factors associated with radiographic radiolucency and patient-reported clinical outcomes. METHODS We identified 71 shoulders with B2 or B3 glenoid morphology that underwent anatomic total shoulder arthroplasty with use of a posteriorly stepped augmented glenoid component and with a preoperative 3-dimensional computed tomography (3D-CT) scan and a minimum of 2 years of clinical and radiographic follow-up. The Penn Shoulder Score (PSS), shoulder range of motion, glenoid center-peg osteolysis, and postoperative version and humeral head subluxation were the main outcome variables of interest. RESULTS Follow-up was a median of 2.4 years (range, 1.9 to 5.7 years); the mean patient age at treatment was 65 ± 7 years (range, 51 to 80 years). PSS, range of motion, humeral head centering, and glenoid version were significantly improved among all patients (p < 0.0001). Patients with persistent posterior subluxation of the humeral head postoperatively had worse preoperative fatty infiltration of the teres minor and greater postoperative component retroversion (p < 0.05). Patients with center-peg osteolysis had more preoperative joint-line medialization and posterior glenoid bone loss (p < 0.05). Patients with more preoperative humeral head posterior subluxation had a lower PSS, adjusting for confounders (p < 0.05). CONCLUSIONS Posteriorly stepped augmented glenoid components can improve pathologic retroversion and posterior subluxation of the humeral head in B2 and B3 glenoids, with significant improvements found in clinical outcome scores at a minimum of 2 years of follow-up in the vast majority of patients. LEVEL OF EVIDENCE Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Jason C Ho
- Department of Orthopaedic Surgery, Orthopaedic & Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | | | - Vahid Entezari
- Department of Orthopaedic Surgery, Orthopaedic & Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | - Bong Jae Jun
- Department of Orthopaedic Surgery, Orthopaedic & Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | - Bashar Alolabi
- St. Joseph's Healthcare, McMaster University, Hamilton, Ontario, Canada
| | - Eric T Ricchetti
- Department of Orthopaedic Surgery, Orthopaedic & Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
| | - Joseph P Iannotti
- Department of Orthopaedic Surgery, Orthopaedic & Rheumatologic Institute, Cleveland Clinic, Cleveland, Ohio
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Tashjian RZ, Chalmers PN. What's New in Shoulder and Elbow Surgery. J Bone Joint Surg Am 2018; 100:1800-1806. [PMID: 30334892 DOI: 10.2106/jbjs.18.00670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Robert Z Tashjian
- Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City, Utah
| | - Peter N Chalmers
- Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City, Utah
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