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Rakauskas TR, Hao KA, Cueto RJ, Marigi EM, Werthel JD, Wright JO, King JJ, Wright TW, Schoch BS, Hones KM. Insertion sites of latissimus dorsi tendon transfer performed during reverse shoulder arthroplasty: A systematic review and meta-analysis. Orthop Traumatol Surg Res 2024:103873. [PMID: 38556209 DOI: 10.1016/j.otsr.2024.103873] [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: 08/29/2023] [Revised: 12/31/2023] [Accepted: 03/26/2024] [Indexed: 04/02/2024]
Abstract
BACKGROUND Reverse shoulder arthroplasty (RSA) with concurrent latissimus dorsi transfer (LDT) is a potential treatment option for restoration of external rotation (ER). Biomechanical studies have emphasized the importance of the insertion site location for achieving optimal outcomes. In this systematic review and meta-analysis, we aimed to describe what insertion sites for LDT are utilized during concomitant RSA and their associated clinical outcomes. METHODS A systematic review and meta-analysis were performed per PRISMA guidelines. We queried PubMed/MEDLINE, Embase, Web of Science, and Cochrane databases to identify articles reporting on patients who received RSA with LDT to restore ER and specified the site of tendon transfer insertion on the humerus. We first describe reported insertion sites in the literature. Secondarily, we present preoperative and postoperative range of motion and Constant score for different insertion sites as well as reported complications. RESULTS Sixteen studies, analyzed as 19 separate cohorts (by insertion site and tendon-transfer), reporting on 264 RSAs with LDT (weighted mean age 66 years, follow-up 39 months, 61% female) were evaluated. Of these, 143 (54%) included a concomitant teres major transfer (LDT/TMT) and 121 (46%) were LDT-only. Fourteen cohorts (14/19, 74%) reported insertion at the posterolateral aspect of the greater tuberosity, four cohorts (4/19, 21%) reported insertion site at the lateral bicipital groove, and one cohort (1/19, 5%) reported separate LDT and TMT with insertion of the TMT to the posterolateral aspect of the greater tuberosity and LDT to the lateral bicipital groove. Meta-analysis revealed no differences in range of motion or Constant score based on humeral insertion site or whether the LDT was transferred alone or with TMT. Leading complications included dislocation, followed by infection and neuropraxia. No discernible correlation was observed between postoperative outcomes and the strategies employed for tendon transfer, prosthesis design, or subscapularis management. CONCLUSION The posterolateral aspect of the greater tuberosity was the most-utilized insertion site for LDT performed with RSA. However, in the current clinical literature, LDT with or without concomitant TMT result in similar postoperative ROM and Constant score regardless of insertion site. Analysis of various proposed transfer sites reinforce the ability of LDT with RSA to restore both FE and ER in patients with preoperative active elevation and external rotation loss. Meta-analysis revealed significant improvements in range of motion and Constant score regardless of humeral insertion site or whether the LDT was transferred alone or with TMT, although future studies are needed to determine whether an ideal tendon transfer technique exists. LEVEL OF EVIDENCE IV.
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Affiliation(s)
| | - Kevin A Hao
- College of Medicine, University of Florida, Gainesville, FL, USA
| | - Robert J Cueto
- College of Medicine, University of Florida, Gainesville, FL, USA
| | - Erick M Marigi
- Department of Orthopedic Surgery, Mayo Clinic, Jacksonville, FL, USA
| | - Jean-David Werthel
- Department of Orthopedic Surgery, Hôpital Ambroise-Paré, Boulogne-Billancourt, France
| | - Jonathan O Wright
- Department of Orthopaedic Surgery & Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Joseph J King
- Department of Orthopaedic Surgery & Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Thomas W Wright
- Department of Orthopaedic Surgery & Sports Medicine, University of Florida, Gainesville, FL, USA
| | - Bradley S Schoch
- Department of Orthopedic Surgery, Mayo Clinic, Jacksonville, FL, USA.
| | - Keegan M Hones
- Department of Orthopaedic Surgery & Sports Medicine, University of Florida, Gainesville, FL, USA
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Oh JH, Jeong HJ, Won YS. Implant selection for successful reverse total shoulder arthroplasty. Clin Shoulder Elb 2023; 26:93-106. [PMID: 36919511 PMCID: PMC10030993 DOI: 10.5397/cise.2022.01193] [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: 08/11/2022] [Accepted: 10/03/2022] [Indexed: 12/23/2022] Open
Abstract
Reverse total shoulder arthroplasty (RTSA) emerged as a new concept of arthroplasty that does not restore normal anatomy but does restore function. It enables the function of the torn rotator cuff to be performed by the deltoid and shows encouraging clinical outcomes. Since its introduction, various modifications have been designed to improve the outcome of the RTSA. From the original cemented baseplate with peg or keel, a cementless baseplate was designed that could be fixed with central and peripheral screws. In addition, a modular-type glenoid component enabled easier revision options. For the humeral component, the initial design was an inlay type of long stem with cemented fixation. However, loss of bone stock from the cemented stem hindered revision surgery. Therefore, a cementless design was introduced with a firm metaphyseal fixation. Furthermore, to prevent complications such as scapular notching, the concept of lateralization emerged. Lateralization helped to maintain normal shoulder contour and better rotator cuff function for improved external/internal rotation power, but excessive lateralization yielded problems such as subacromial notching. Therefore, for patients with pseudoparalysis or with risk of subacromial notching, a medial eccentric tray option can be used for distalization and reduced lateralization of the center of rotation. In summary, it is important that surgeons understand the characteristics of each implant in the various options for RTSA. Furthermore, through preoperative evaluation of patients, surgeons can choose the implant option that will lead to the best outcomes after RTSA.
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Affiliation(s)
- Joo Han Oh
- Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Hyeon Jang Jeong
- Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Yoo-Sun Won
- Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
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Lee HJ, Yoon CY, Kim YS. Comparison of Clinical Performance of Inlay versus Onlay Humerus Implants in Reverse Total Shoulder Arthroplasty. Clin Orthop Surg 2023; 15:135-144. [PMID: 36778983 PMCID: PMC9880513 DOI: 10.4055/cios22084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 07/11/2022] [Accepted: 07/31/2022] [Indexed: 11/25/2022] Open
Abstract
Background Reverse total shoulder arthroplasty (RTSA) has become the treatment of choice for the management of massive rotator cuff tears combined with cuff tear arthropathy, and many novel designs have been proposed to overcome the shortcomings of classic RTSA. This study sought to evaluate and compare RTSA outcomes among patients with cuff tear arthropathy treated by a medialized inlay humerus implant with a neck shaft angle of 155° or a lateralized onlay implant with a neck shaft angle of 145°. Methods A retrospective review of 32 inlay implants and 32 onlay implants was performed. The active range of motion (ROM), visual analog scale (VAS) for pain, motor power for elevation and external rotation, and functional scores including the American Shoulder and Elbow Surgeons score, Constant score, and Korean Shoulder Scoring system were assessed before surgery, at 3, 6, and 12 months after surgery, and at the last follow-up at least 24 months after surgery. Scapular notching, lateral humeral offset, and deltoid wrapping offset were assessed for radiographic evaluation. Results The preoperative demographic data of both groups showed no significant differences (p > 0.05). The mean follow-up period was 24.9 months. Significant improvements in forward flexion, functional scores, and pain VAS score were observed in both groups at the last follow-up. No significant differences in ROM or functional scores were found between two groups at each time point, except that the onlay implant group exhibited a significantly greater range of external rotation at 3 and 12 months after surgery and at the last follow-up. The rate of scapular notching and the final power improvement did not show significant differences between the groups. Conclusions Primary RTSA using inlay or onlay humerus implants was associated with recovery from pseudoparalysis and good clinical outcomes. However, RTSA with onlay humerus implantation led to clinically superior results in terms of external rotation.
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Affiliation(s)
- Hyo-Jin Lee
- Department of Orthopedic Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Chi-Young Yoon
- Department of Orthopedic Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Yang-Soo Kim
- Department of Orthopedic Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Wolf GJ, Reid JJ, Rabinowitz JR, Barcel DA, Barfield WR, Eichinger JK, Friedman RJ. Does glenohumeral offset affect clinical outcomes in a lateralized reverse total shoulder arthroplasty? J Shoulder Elbow Surg 2023; 32:50-58. [PMID: 35872171 DOI: 10.1016/j.jse.2022.06.007] [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: 03/26/2022] [Revised: 05/19/2022] [Accepted: 06/05/2022] [Indexed: 02/01/2023]
Abstract
BACKGROUND Reverse total shoulder arthroplasty (rTSA) exhibits high rates of success and low complication rates. rTSA has undergone numerous design adaptations over recent years, and lateralization of implant components provides theoretical and biomechanical benefits in stability and range of motion (ROM) as well as decreased rates of notching. However, the magnitude of implant lateralization and its effect on these outcomes is less well understood. The purpose of this study was to evaluate how increasing glenohumeral offset affects outcomes after rTSA, specifically in a lateralized humerus + medialized glenoid implant model. METHODS Primary rTSA using a lateralized humeral + medialized glenoid implant model performed at a single academic institution between 2012 and 2018 were retrospectively reviewed. Patient-reported outcome (PRO) parameters and clinical outcomes including ROM were evaluated both pre- and postoperatively. Pre- and postoperative radiographs were analyzed for measurement of glenohumeral offset, defined as the acromial-tuberosity offset (ATO) distance on the anteroposterior radiograph. RESULTS A total of 130 rTSAs were included in the analysis, with a mean follow-up of 35 mo. The mean postoperative absolute ATO was 16 mm, and the mean delta ATO (difference from pre- to postoperatively) was 4.6 mm further lateralized. Among all study patients, improvements in all ROM parameters and all PROs were observed from pre- to postoperative assessments. When assessing for the effects of lateralization on these outcomes, multivariate analysis failed to reveal a significant effect from the absolute postoperative ATO or the delta ATO on any outcome parameter. CONCLUSIONS rTSA using a lateralized humeral + medialized glenoid implant model exhibits excellent clinical outcomes in ROM and PROs. However, the magnitude of lateralization as measured radiographically by the ATO did not significantly affect these outcomes; patients exhibited universally good outcomes irrespective of the degree of offset restoration.
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Affiliation(s)
- G Jacob Wolf
- Medical University of South Carolina, Charleston, SC, USA
| | - Jared J Reid
- Medical University of South Carolina, Charleston, SC, USA
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Postoperative acromiohumeral interval affects shoulder range of motions following reverse total shoulder arthroplasty. Sci Rep 2022; 12:21011. [PMID: 36470933 PMCID: PMC9722688 DOI: 10.1038/s41598-022-25173-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 11/25/2022] [Indexed: 12/12/2022] Open
Abstract
Reverse total shoulder arthroplasty (RTSA) improves function and reduces pain for patients with complex shoulder problems. However, there is a lack of literature regarding the association of radiographic parameters on clinical outcomes after RTSA. The aim of this study was to analyze various radiographic parameters that may be predictive of clinical outcomes after RTSA. A total of 55 patients treated with RTSA were enrolled. Shoulder radiographic parameters were used for measurement of critical shoulder angle, acromial index, acromiohumeral interval, deltoid lever arm, acromial angulation, glenoid version, and acromial height. Preoperative and postoperative clinical outcomes were evaluated at a minimum 2-year follow-up. An analysis of correlations between radiographic parameters and clinical outcomes was then performed. A significant change in critical shoulder angle, acromiohumeral interval, and deltoid lever arm was observed between preoperative and postoperative radiographic measurements. A significant improvement was observed in all clinical outcomes and range of motions from preoperative to postoperative (all p < 0.001). A negative correlation of postoperative acromiohumeral interval with forward flexion (r = - 0.270; p = 0.046), external rotation (r = - 0.421; p = 0.001), and internal rotation (r = 0.275; p = 0.042) was observed at final follow-up. In addition, postoperative acromiohumeral interval less than 29 mm had an 86% positive predictive value of obtaining 130° of forward flexion and 45° of external rotation. It was found that postoperative acromiohumeral interval showed an association with active range of motion in patients who underwent RTSA. In particular, excessive distalization reduced forward flexion and external rotation motion of the shoulder in patients treated with RTSA.
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Lauria M, Hastings M, DiPaola MJ, Duquin TR, Ablove RH. Factors affecting internal rotation following total shoulder arthroplasty. JSES REVIEWS, REPORTS, AND TECHNIQUES 2022; 2:431-436. [PMID: 37588455 PMCID: PMC10426481 DOI: 10.1016/j.xrrt.2022.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Background Reverse shoulder arthroplasty (RSA) was developed in the late twentieth century to provide a stable arthroplasty option for patients with rotator cuff deficiency arthropathy. Since its inception, there have been changes in materials, design, and positioning. One of the persistent clinical issues has been difficulty with internal rotation (IR) and the associated difficulty with behind the back activities. Implant design, positioning, and the available soft tissues may influence IR after RSA. The purpose of this systematic review is to assess factors that impact IR following RSA. Methods The literature search, based on PRISMA guidelines, used 4 databases: Pubmed, Embase, Web of Science, and Cochrane Central Register of Controlled Trials. We included clinical trials that compared different implantation and design modifications and assessed IR. Results Of the 617 articles identified in the initial search, 46 satisfied the inclusion criteria. The articles explored multiple factors of RSA and their effects on IR, including humeral and glenoid components and muscle function and integrity. Among humeral factors affecting rotation, there was a broad consensus that: IR decreases as retroversion increases, humeral neck-shaft angle less than 155° improves IR, lateralized humeral offset does not improve IR, and shallow cups improve IR. Insert thickness was not associated with a reproducible effect. Of the studies evaluating the effect of glenoid components, there was majority agreement that glenosphere lateralization improved IR, and there were mixed results regarding the effects of glenosphere size and tilt. Others included one study in each: glenoid overhang, retroversion, and baseplate. One study found an association between teres minor insufficiency and improved IR, with mixed results in the presence of fatty infiltration in both teres minor and subscapularis. Most studies noted subscapularis repair had no effect on IR. Conclusion Prosthetic variables affecting IR are not widely studied. Based on the existing literature, evidence is conflicting. More research needs to be undertaken to gain a greater understanding regarding which factors can be modified to improve IR in RSA patients.
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Affiliation(s)
- Mychaela Lauria
- University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, NY, USA
| | - Mikaela Hastings
- University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, NY, USA
| | | | - Thomas R. Duquin
- Department of Orthopaedics, University at Buffalo, Buffalo, NY, USA
| | - Robert H. Ablove
- Department of Orthopaedics, University at Buffalo, Buffalo, NY, USA
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Zmistowski B, Cahill SV, Hill JR, Gibian JT, Sokrab R, Keener JD, Aleem AW. The rate and predictors of healing of repaired lesser tuberosity osteotomy in reverse total shoulder arthroplasty. JSES Int 2022; 7:10-15. [PMID: 36820440 PMCID: PMC9937848 DOI: 10.1016/j.jseint.2022.09.007] [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: 11/30/2022] Open
Abstract
Background Evidence is building that a functional subscapularis improves function-specifically internal rotation tasks-following reverse total shoulder arthroplasty (rTSA). However, the optimal method for subscapularis repair during rTSA remains unknown with variable healing rates reported. This study aims to investigate the rate of and predictors for healing a lesser tuberosity osteotomy (LTO) following rTSA. Methods Following local institutional review board approval, patients with at least one-year follow-up for rTSA managed with an LTO and subsequent repair between March, 2017 and March, 2020 were retrospectively identified. Shoulders were selected for LTO repair based upon preoperative imaging and intraoperative assessment of subscapularis quality. All patients were implanted with a system consisting of a 150° or 155° (constrained) humeral neck-shaft angle and 2.5 to 4.5 millimeters (mm) of glenoid lateralization (Trabecular Metal Reverse Shoulder System; Zimmer Biomet, Warsaw, IN, USA). At a minimum of six months, radiographs were reviewed for an assessment of LTO healing by three independent reviewers. Healing was classified as displaced, fibrous union, or ossified union. For assessing predictors, the repair was considered intact if the LTO fragment was not displaced (fibrous union or ossified union). Results Sixty-five rTSA with LTO repair were performed in 64 patients. These patients had an average age of 67.2 years (range, 31-81) and 36 (55.4%; 36/65) were female. At an average follow-up of 15.2 months (range, 8-38), 50 cases (76.9%; 50/65) were classified as having an ossified union. The radiographic healing could not be assessed in a single case. Of the 14 cases without ossific union, 8 (12.3%; 8/65) were displaced and 6 (9.2%; 6/65) were classified as a fibrous union. In logistic regression, only combined humeral liner height predicted LTO displacement (odds ratio = 1.4 [95% confidence interval = 1.1-1.8]; P = .01). Humeral loosening was not found in any cases following LTO. Conclusion This analysis demonstrates that radiographic healing of LTO repair is more favorable than published rates of healing after subscapularis tenotomy or peel in the setting of rTSA. Subscapularis management with LTO provides the ability to monitor repair integrity with plain radiographs and a predictable radiographic healing rate. The integrity of subscapularis repair may be influenced by the use of thicker humeral liners. Further investigation is needed to determine the functional impact of a healed subscapularis following rTSA.
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Affiliation(s)
- Benjamin Zmistowski
- Corresponding author: Benjamin Zmistowski, MD, Department of Orthopedic Surgery, Washington University in St. Louis, 660 S. Euclid Ave. Campus Box 8233, St. Louis, MO 63110, USA.
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Lee JH, Chun YM, Kim DS, Lee DH, Shin SJ. Effects of neuromuscular electrical muscle stimulation on the deltoid for shoulder function restoration after reverse total shoulder arthroplasty in the early recovery period: a prospective randomized study. Arch Orthop Trauma Surg 2022; 143:3037-3046. [PMID: 35804165 DOI: 10.1007/s00402-022-04515-0] [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: 09/06/2021] [Accepted: 06/09/2022] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Neuromuscular electrical stimulation (NMES) is a treatment modality that has been used to accelerate the rehabilitation of patients with neurological damage. However, it is unclear whether NMES of the deltoid can lead to the early restoration of shoulder function after reverse total shoulder arthroplasty (RSA). MATERIALS AND METHODS In this prospective and randomized study, 88 patients who underwent RSA with the same prosthesis design for cuff tear arthropathy or irreparable rotator cuff tear were assessed. The patients were divided into two groups (NMES group and non-NMES group, 44 patients each). For the NMES group, two pads of the NMES device were placed over the middle and posterior deltoid area, and NMES was maintained for 1 month after surgery. Shoulder functional outcomes and deltoid thickness were compared at 3, 6, and 12 months postoperatively. Shoulder functional outcomes were assessed based on the visual analog scale (VAS) for pain, American Shoulder and Elbow Surgeons (ASES), and Constant scores and the range of motion (ROM) and power of the affected shoulder. The thickness of the anterior, middle, and posterior deltoid was measured by ultrasonography. RESULTS A total of 76 patients (NMES group, 33 patients; non-NMES group, 43 patients) were enrolled in the final analysis. The preoperative demographics and status of the remaining rotator cuff of both groups were not significantly different. At postoperative 3 months, the ROM and power of external rotation of the NMES group were significantly greater than those of the non-NMES group (ROM, 36° ± 14° vs. 29° ± 12°; P = .003; power, 4.8 kg ± 1.8 kg vs. 3.8 kg ± 1.0 kg; P < .002). The ROM of external rotation of the NMES group at postoperative 6 months was also greater than that of the non-NMES group (41° ± 12° vs. 34° ± 11°; P = .013). However, there was no significant difference in the VAS, ASES, and Constant scores at all follow-up points despite gradual improvements until 1 year postoperatively. Serial measurements of the thickness of the anterior, middle, and posterior deltoid of both groups did not show significant differences. CONCLUSIONS Postoperative NMES of the deltoid after RSA contributed to significantly faster ROM restoration and considerable improvement in the power of external rotation. Therefore, NMES following RSA could lead to the early restoration of external rotation and recovery of deltoid function.
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Affiliation(s)
- Jae-Hoo Lee
- Department of Orthopaedic Surgery, Inje University, Ilsan Paik Hospital, Goyang-si, Republic of Korea
| | - Yong-Min Chun
- Department of Orthopaedic Surgery, College of Medicine, Arthroscopy and Joint Research Institute, Severance Hospital, Yonsei University, Seoul, Republic of Korea
| | - Doo-Sup Kim
- Department of Orthopaedic Surgery, Wonju College of Medicine, Wonju Severance Christian Hospital, Yonsei University, Wonju, Republic of Korea
| | - Doo-Hyung Lee
- Department of Orthopaedic Surgery, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - Sang-Jin Shin
- Department of Orthopaedic Surgery, Ewha Shoulder Disease Center, Seoul Hospital, Ewha Womans University School of Medicine, Seoul, Republic of Korea.
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Innovations in Shoulder Arthroplasty. J Clin Med 2022; 11:jcm11102799. [PMID: 35628933 PMCID: PMC9144112 DOI: 10.3390/jcm11102799] [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] [Received: 03/05/2022] [Revised: 05/07/2022] [Accepted: 05/12/2022] [Indexed: 11/22/2022] Open
Abstract
Innovations currently available with anatomic total shoulder arthroplasty include shorter stem designs and augmented/inset/inlay glenoid components. Regarding reverse shoulder arthroplasty (RSA), metal augmentation, including custom augments, on both the glenoid and humeral side have expanded indications in cases of bone loss. In the setting of revision arthroplasty, humeral options include convertible stems and newer tools to improve humeral implant removal. New strategies for treatment and surgical techniques have been developed for recalcitrant shoulder instability, acromial fractures, and infections after RSA. Finally, computer planning, navigation, PSI, and augmented reality are imaging options now available that have redefined preoperative planning and indications as well intraoperative component placement. This review covers many of the innovations in the realm of shoulder arthroplasty.
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Sulkar HJ, Knighton TW, Amoafo L, Aliaj K, Kolz CW, Zhang Y, Hermans T, Henninger HB. In Vitro Simulation of Shoulder Motion Driven by Three-Dimensional Scapular and Humeral Kinematics. J Biomech Eng 2022; 144:051008. [PMID: 34817051 PMCID: PMC8822462 DOI: 10.1115/1.4053099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 11/12/2021] [Indexed: 11/08/2022]
Abstract
In vitro simulation of three-dimensional (3D) shoulder motion using in vivo kinematics obtained from human subjects allows investigation of clinical conditions in the context of physiologically relevant biomechanics. Herein, we present a framework for laboratory simulation of subject-specific kinematics that combines individual 3D scapular and humeral control in cadavers. The objectives were to: (1) robotically simulate seven healthy subject-specific 3D scapulothoracic and glenohumeral kinematic trajectories in six cadavers, (2) characterize system performance using kinematic orientation accuracy and repeatability, and muscle force repeatability metrics, and (3) analyze effects of input kinematics and cadaver specimen variability. Using an industrial robot to orient the scapula range of motion (ROM), errors with repeatability of ±0.1 mm and <0.5 deg were achieved. Using a custom robot and a trajectory prediction algorithm to orient the humerus relative to the scapula, orientation accuracy for glenohumeral elevation, plane of elevation, and axial rotation of <3 deg mean absolute error (MAE) was achieved. Kinematic accuracy was not affected by varying input kinematics or cadaver specimens. Muscle forces over five repeated setups showed variability typically <33% relative to the overall simulations. Varying cadaver specimens and subject-specific human motions showed effects on muscle forces, illustrating that the system was capable of differentiating changes in forces due to input conditions. The anterior and middle deltoid, specifically, showed notable variations in patterns across the ROM that were affected by subject-specific motion. This machine provides a platform for future laboratory studies to investigate shoulder biomechanics and consider the impacts of variable input kinematics from populations of interest, as they can significantly impact study outputs and resultant conclusions.
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Affiliation(s)
- Hema J. Sulkar
- Department of Orthopaedics, University of Utah, Salt Lake City, UT 84108; Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112
| | - Tyler W. Knighton
- Department of Orthopaedics, University of Utah, Salt Lake City, UT 84108; Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112
| | - Linda Amoafo
- Department of Epidemiology, University of Utah, Salt Lake City, UT 84132
| | - Klevis Aliaj
- Department of Orthopaedics, University of Utah, Salt Lake City, UT 84108; Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112
| | - Christopher W. Kolz
- Department of Orthopaedics, University of Utah, Salt Lake City, UT 84108; Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112
| | - Yue Zhang
- Department of Epidemiology, University of Utah, Salt Lake City, UT 84132
| | - Tucker Hermans
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112; Robotics Center and School of Computing, University of Utah, Salt Lake City, UT 84112
| | - Heath B. Henninger
- Department of Orthopaedics, University of Utah, Salt Lake City, UT 84108; Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112; Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112
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Powell SN, Lilley BM, Peebles AM, Dekker TJ, Warner JJ, Romeo AA, Denard PJ, Provencher MT. Impact of fatty infiltration of the rotator cuff on reverse total shoulder arthroplasty outcomes: a systematic review. JSES REVIEWS, REPORTS, AND TECHNIQUES 2022; 2:125-130. [PMID: 37587967 PMCID: PMC10426473 DOI: 10.1016/j.xrrt.2021.12.001] [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] [Indexed: 08/18/2023]
Abstract
Background and hypothesis The impact of preoperative fatty infiltration of specific rotator cuff muscles on the outcomes of reverse total shoulder arthroplasty (rTSA) has not been well defined. Preoperative fatty infiltration of the shoulder musculature will negatively affect rTSA outcomes. Methods A comprehensive literature review was conducted as per the Preferred Reporting Items for Systematic Reviews and Meta-analyses using PubMed, Embase, OVID Medline, Scopus, Cinahl, Web of Science, and Cochrane databases for original, English-language studies evaluating effect of fatty infiltration of shoulder musculature on rTSA outcomes published from January 1, 2000 to present. Blinded reviewers conducted multiple screens. All included studies were graded based on the level of evidence, and data concerning patient demographics and postoperative outcomes were extracted. Results A total of 11 articles were included, including one level I article, three level III articles, and seven level IV articles. The review consisted of 720 patients and 731 shoulders (320 women and 157 men), with a mean age of 72.4 years. A single deltopectoral approach was performed for a majority of studies (627/731 shoulders), followed by a superolateral approach (70/731 shoulders) and a single transdeltoid approach (4/731 patients). Eleven studies reported data specifically about preoperative fatty infiltration of the rotator cuff musculature; the teres minor was studied most widely (298/731 shoulders), followed by the subscapularis (256/731 shoulders) and infraspinatus (232/731 shoulders). The Constant score (562/731 shoulders) and American Shoulder and Elbow Surgeons score (284/731 shoulders) were the most common recorded outcome scores. Fatty infiltration of the teres minor, supraspinatus, and infraspinatus was associated with worse range of motion after rTSA. Conclusion Preoperative fatty infiltration of the rotator cuff, particularly of the teres minor and infraspinatus, has a negative impact on subjective patient outcomes and restoration of range of motion, especially external rotation, after rTSA. The impact of fatty infiltration of the other rotator cuff muscles remains unclear, which may be due to intersurgeon differences in the handling of the remaining rotator cuff muscles or differences in implant design. The evaluated literature provides information on which patients can be educated about probable outcomes and restoration of function after rTSA.
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Affiliation(s)
- Sarah N. Powell
- Georgetown University School of Medicine, Washington, DC, USA
| | | | | | - Travis J. Dekker
- Eglin Air Force Base, 96th Medical Group, United States Air Force, Eglin, FL, USA
| | | | - Anthony A. Romeo
- Department of Orthopaedic Surgery, DuPage Medial Group, Chicago, IL, USA
| | | | - Matthew T. Provencher
- The Steadman Philippon Research Institute, Vail, CO, USA
- The Steadman Clinic, Vail, CO, USA
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12
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Youn SM, Lee HS, Rhee SM, Rhee YG. Medialized vs. lateralized humeral implant in reverse total shoulder arthroplasty: the comparison of outcomes in pseudoparalysis with massive rotator cuff tear. J Shoulder Elbow Surg 2022; 31:736-746. [PMID: 34543745 DOI: 10.1016/j.jse.2021.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 08/07/2021] [Accepted: 08/10/2021] [Indexed: 02/01/2023]
Abstract
BACKGROUND With the increasing use of lateralized humeral implants in reverse total shoulder arthroplasty (RTSA), it is still unclear whether this design will be as advantageous as the medialized humeral implants in the setting of pseudoparalysis (PP). METHODS A total of 51 eligible RTSA cases for PP signs due to massive rotator cuff deficiency were selected for the retrospective review. Twenty-five patients were allocated to group L in which the isolated humeral side lateralization was performed (neck-shaft angle of 145°), and 26 patients were allocated to group M (neck-shaft angle of 155°). Pre- and postoperative radiologic measurements including critical shoulder angle, acromiohumeral distance (AHD), lateral humeral offset (LHO), and deltoid wrapping offset (DWO), as well as range of motion (ROM) and clinical outcome scores, were compared. The mean age was 71.0 ± 6.5 years for group L and 70.3 ± 7.0 years for group M, and the overall mean follow-up period was 49.0 ± 13.5 months (range, 25.7-68.9). RESULTS The preoperative radiologic measurements were similar, but the postoperative LHO and DWO were significantly larger for group L, whereas the postoperative AHD was larger for group M compared with group L, with the values being 39.8 ± 9.7 mm and 33.6 ± 10.4 mm, respectively (P = .034). For the ROM, active forward elevation did improve significantly for both, starting preoperatively with the active ranges of 39° ± 19° (passively 153° ± 24°) for group L and 42° ± 18° (passively 156° ± 11°) for group M-the final postoperative active ranges being 142° ± 16° and 133° ± 33°, respectively, without significant difference between the groups (P = .426). The postoperative recovery of PP for group L was 100% (25 of 25), whereas for group M, it was 96.2% (25 of 26). The final visual analog scale (VAS) scores and University of California Los Angeles (UCLA) shoulder scores improved significantly for both groups, but the differences between the groups at the final assessments were insignificant. The 4 complications were periprosthetic fracture, acromial stress fracture, periprosthetic joint infection, and neuropraxia, all of which were in group M, and scapular notching with higher grades were more prevalent for group M (26.9%, 7 of 26). CONCLUSIONS With RTSA, good outcomes and recovery were achieved in most cases of PP. The postoperative active elevation range and functional outcomes were not affected by medialization or lateralization of the humeral implant. Earlier recovery of motion was observed with the lateralized group, but no significant differences were seen in the final ROM between the groups.
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Affiliation(s)
- Seung-Min Youn
- Department of Orthopaedic Surgery, Royal Brisbane and Women's Hospital, Herston, QLD, Australia
| | - Hee Sung Lee
- Shoulder & Elbow Clinic, Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University Hospital, Seoul, Republic of Korea
| | - Sung-Min Rhee
- Shoulder & Elbow Clinic, Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University Hospital, Seoul, Republic of Korea
| | - Yong Girl Rhee
- Shoulder & Elbow Clinic, Department of Orthopaedic Surgery, Myongji Hospital, Goyang-si, Gyeonggi-do, Republic of Korea.
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13
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Freislederer F, Toft F, Audigé L, Marzel A, Endell D, Scheibel M. Lateralized vs. classic Grammont-style reverse shoulder arthroplasty for cuff deficiency Hamada stage 1-3: does the design make a difference? J Shoulder Elbow Surg 2022; 31:341-351. [PMID: 34450279 DOI: 10.1016/j.jse.2021.07.022] [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: 04/19/2021] [Revised: 07/21/2021] [Accepted: 07/26/2021] [Indexed: 02/01/2023]
Abstract
BACKGROUND Reverse shoulder arthroplasty (RSA) with a lateralized design is thought to improve outcomes. Our aim was to compare RSA with the classic Grammont prosthesis against a prosthesis with 135° inclination and a lateralized glenosphere for cuff-deficient shoulders. METHODS Patients with irreparable massive posterosuperior rotator cuff tear Hamada grade 1-3 underwent RSA and were documented prospectively up to 24 months postsurgery. Comparative RSA groups were "lateralized" (L), with 135° humeral inclination and 36+4-mm lateralized glenosphere (n = 44), and "Grammont" (G), with 155° humeral inclination and 36+2-mm eccentric glenosphere (n = 23). Range of motion including the Apley scratch test, abduction strength, Constant-Murley score (CS), and Shoulder Pain and Disability Index (SPADI) were assessed. Anteroposterior and axial radiographs were evaluated at 24 months, and additional measurements of scapular neck and glenoid anatomy, baseplate and glenosphere position, center of rotation, humeral offset, and lateralization and distalization shoulder angles were made. Linear regression and mixed models adjusted for sex differences and preoperative values were applied. RESULTS Overall CS and SPADI outcomes were not significantly different between groups (P ≥ .654). For group L, external rotation remained stable up to the 2-year follow-up and was higher than for group G (P = .012 ); a greater proportion of group L patients could reach the lumbar vertebra 3 (L3) (70% vs. 48% in group G) (P = .26). Group G had a higher inferior glenosphere overhang (P = .020) and center of rotation (COR) medialization (P < .001), whereas group L had higher humeral offset (P < .001) and lateralization shoulder angle (P < .001) with a trend toward higher baseplate positioning (P = .045). The rate of scapular notching was 2.9 times higher for group G than group L (P = .001). CONCLUSION RSA with 135° humeral inclination and a lateralized glenosphere shows similar outcome scores as the classic Grammont design but enables better preservation of external rotation and reduces the rate of scapular notching compared with the classic Grammont design in Hamada 1-3 patients with irreparable posterosuperior tears.
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Affiliation(s)
| | - Felix Toft
- Shoulder and Elbow Surgery, Schulthess Clinic, Zurich, Switzerland
| | - Laurent Audigé
- Research and Development, Shoulder and Elbow Surgery, Schulthess Clinic, Zurich, Switzerland
| | - Alex Marzel
- Research and Development, Shoulder and Elbow Surgery, Schulthess Clinic, Zurich, Switzerland
| | - David Endell
- Shoulder and Elbow Surgery, Schulthess Clinic, Zurich, Switzerland
| | - Markus Scheibel
- Shoulder and Elbow Surgery, Schulthess Clinic, Zurich, Switzerland; Charité-Universitaetsmedizin Berlin, Berlin, Germany.
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14
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Puzzitiello RN, Moverman MA, Menendez ME, Hart PA, Kirsch J, Jawa A. Rotator cuff fatty infiltration and muscle atrophy do not impact clinical outcomes after reverse total shoulder arthroplasty for glenohumeral osteoarthritis with intact rotator cuff. J Shoulder Elbow Surg 2021; 30:2506-2513. [PMID: 33774168 DOI: 10.1016/j.jse.2021.03.135] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 03/02/2021] [Accepted: 03/07/2021] [Indexed: 02/01/2023]
Abstract
BACKGROUND The clinical significance of rotator cuff muscle quality following reverse total shoulder arthroplasty (RTSA) remains uncertain. The purpose of this study was to evaluate the influence of rotator cuff fatty infiltration (FI) and muscle atrophy (MA) on clinical outcomes following RTSA for glenohumeral osteoarthritis (GHOA). METHODS One hundred eight shoulders with primary GHOA that underwent RTSA with a lateralized glenosphere for GHOA with a minimum of 2-year follow-up were identified from a prospectively maintained registry. Each rotator cuff muscle was assessed on preoperative magnetic resonance imaging for FI and quantitative amount of MA. Pre- and postoperative outcomes included American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form score, Single Assessment Numerical Evaluation (SANE) score, visual analog scale pain score, and range of motion (ROM) measurements. RESULTS Eighty-one patients with a mean age of 70.7 ± 5.4 years (range: 57-85) were included who underwent RTSA with a mean follow-up of 2.1 years (range: 2-3.9 years). There was a significant improvement in all outcome measures postoperatively (P < .01). Twenty-two patients (27.1%) had moderate to severe combined infraspinatus and teres minor FI. There was no significant difference in the postoperative external rotation or clinical outcomes compared with those patients with only mild FI (P > .05). Forty-three patients (53.1%) had moderate to severe global rotator cuff FI. There was no significant difference in postoperative outcomes compared with those patients with only mild FI (P < .01). Univariate analysis did not reveal any significant association between the degree of FI or MA of any individual rotator cuff muscle and postoperative clinical outcomes or ROM. The size ratio of the posterior rotator cuff to the subscapularis muscle was positively correlated with preoperative SANE scores but negatively correlated with absolute postoperative and change in preoperative to postoperative SANE scores. However, there were no significant correlations between this size ratio and the other outcome measures. CONCLUSION Rotator cuff muscle quality as assessed by MA and FI does not impact clinical outcomes following RTSA with a lateralized glenosphere in patients with GHOA and an intact rotator cuff.
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Affiliation(s)
| | - Michael A Moverman
- Department of Orthopaedic Surgery, New England Baptist Hospital, Boston, MA, USA
| | - Mariano E Menendez
- Department of Orthopaedic Surgery, New England Baptist Hospital, Boston, MA, USA
| | | | - Jacob Kirsch
- Department of Orthopaedic Surgery, New England Baptist Hospital, Boston, MA, USA; Boston Sports and Shoulder Center, Waltham, MA, USA
| | - Andrew Jawa
- Department of Orthopaedic Surgery, New England Baptist Hospital, Boston, MA, USA; Boston Sports and Shoulder Center, Waltham, MA, USA.
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15
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Lee JH, Chun YM, Kim DS, Lee DH, Shin SJ. Early restoration of shoulder function in patients with the Grammont prosthesis compared to lateralized humeral design in reverse shoulder arthroplasty. J Shoulder Elbow Surg 2021; 30:2533-2542. [PMID: 33813010 DOI: 10.1016/j.jse.2021.03.145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 03/19/2021] [Accepted: 03/22/2021] [Indexed: 02/01/2023]
Abstract
BACKGROUND This study aimed to compare the clinical outcomes and radiographic parameters of patients after reverse shoulder arthroplasty (RSA) between the Grammont prosthesis and lateralized humeral design prosthesis. METHODS A total of 114 patients who underwent RSA with a lateralized humeral design (group L; 71 shoulders) and medialized humeral design (group M; 43 shoulders) prosthesis for cuff tear arthropathy or irreparable rotator cuff tear were enrolled. Clinical outcomes including visual analog scale (VAS), American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), and Constant scores and range of motion (ROM) were serially followed up at postoperative 3, 6, 12, and 24 months. Radiographic parameters were measured to evaluate preoperative and postoperative status. RESULTS Both prostheses demonstrated similar clinical outcomes and shoulder function preoperatively and at postoperative 2 years (P >.05). However, patients in group M had significantly better postoperative active forward flexion (postoperative 3 months, 115° ± 12° vs. 101° ± 14°; P <.001; 6 months, 125° ± 13° vs. 118° ± 13°; P <.013) and abduction (3 months, 105° ± 12° vs. 98° ± 12°; P = .002); VAS (3 months, 3.1 ± 1.2 vs. 3.7 ± 1.4; P = .031; 6 months, 2.3 ± 1.1 vs. 2.8 ± 1.3; P = .038); ASES (3 months, 64.2 ± 7.0 vs. 60.4 ± 9.2; P = .022; 6 months, 70.6 ± 6.0 vs. 66.6 ± 8.1; P = .007); and Constant scores (6 months, 59.6 ± 6.9 vs. 55.7 ± 9.3; P = .020). Group L showed a significantly lower rate of scapular notching than group M (15.5% vs. 41.8%; P < .001). The position of the proximal humerus in group L was more lateralized and less distalized than in group M after RSA. CONCLUSIONS RSA with both the Grammont and lateralized humeral design prostheses provided similar shoulder ROM restoration and functional improvements at a minimum of 2 years. However, patients with a humeral lateralized prosthesis showed slower recovery of shoulder function and ROM up to postoperative 6 months despite a lower incidence of scapular notching.
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Affiliation(s)
- Jae-Hoo Lee
- Department of Orthopaedic Surgery, Inje University, Ilsan Paik Hospital, Goyang-si, Republic of Korea
| | - Yong-Min Chun
- Department of Orthopaedic Surgery, Arthroscopy and Joint Research Institute, Severance Hospital, Yonsei University, College of Medicine, Seoul, Republic of Korea
| | - Doo-Sup Kim
- Department of Orthopaedic Surgery, Wonju College of Medicine, Wonju Severance Christian Hospital, Yonsei University, Wonju, Republic of Korea
| | - Doo-Hyung Lee
- Department of Orthopaedic Surgery, School of Medicine, Ajou University, Suwon, Republic of Korea
| | - Sang-Jin Shin
- Department of Orthopaedic Surgery, Ewha Shoulder Disease Center, Seoul Hospital, Ewha Womans University School of Medicine, Seoul, Republic of Korea.
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16
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Kerrigan AM, Reeves J, Langohr GDG, Johnson JA, Athwal GS. Reverse shoulder arthroplasty glenoid lateralization influences scapular spine strains. Shoulder Elbow 2021; 13:610-619. [PMID: 34804210 PMCID: PMC8600669 DOI: 10.1177/1758573220935567] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 05/10/2020] [Accepted: 05/11/2020] [Indexed: 11/17/2022]
Abstract
BACKGROUND Scapular spine insufficiency fractures following reverse shoulder arthroplasty are poorly understood. There exists limited literature regarding the role of reverse shoulder arthroplasty lateralization on scapular spine strains and fractures. The purpose of this cadaveric biomechanical simulator study was to evaluate the role of glenoid lateralization on scapular spine strain. METHODS Eight cadaveric shoulders were tested using an in-vitro simulator. A custom modular reverse shoulder arthroplasty was implanted that allowed for in-situ glenoid lateralization adjustment. Scapular spine strain was measured by strain gauges placed in clinically relevant Levy zones along the scapular spine. All specimens were tested in loaded forward elevation and abduction. RESULTS Glenoid lateralization from 0 to 5 mm caused negligible changes in scapular spine strains. Lateralization from 5 to 10 mm, however, caused significant increases in strain at 0° forward elevation in all strain gauges (p < 0.026). Strains measured in Levy zone 2 were significantly higher than all other locations (p < 0.039). Additionally, forward elevation resulted in significantly higher strain values than abduction (p = 0.001). CONCLUSIONS Glenoid lateralization is an important parameter in reverse shoulder arthroplasty; however, our results demonstrate higher degrees of lateralization may place higher strains on the scapular spine. An understanding of reverse shoulder arthroplasty lateralization and scapular spine strains is important to optimize parameters and to mitigate negative effects. LEVEL OF EVIDENCE Basic Sciences Study, Cadaveric Model, Biomechanics.
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Affiliation(s)
| | | | | | | | - George S Athwal
- George S Athwal, St Joseph's Health Care, PO Box
5777, STN B, London, Ontario N6A 4V2, Canada.
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17
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Nabergoj M, Onishi S, Lädermann A, Kalache H, Trebše R, Bothorel H, Collin P. Can Lateralization of Reverse Shoulder Arthroplasty Improve Active External Rotation in Patients with Preoperative Fatty Infiltration of the Infraspinatus and Teres Minor? J Clin Med 2021; 10:jcm10184130. [PMID: 34575241 PMCID: PMC8468982 DOI: 10.3390/jcm10184130] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/28/2021] [Accepted: 09/08/2021] [Indexed: 11/16/2022] Open
Abstract
(1) Background: Postoperative recovery of external rotation after reverse shoulder arthroplasty (RSA) has been reported despite nonfunctional external rotator muscles. Thus, this study aimed to clinically determine the ideal prosthetic design allowing external rotation recovery in such a cohort. (2) Methods: A monocentric comparative study was retrospectively performed on patients who had primary RSA between June 2013 and February 2018 with a significant preoperative fatty infiltration of the infraspinatus and teres minor. Two groups were formed with patients with a lateral humerus/lateral glenoid 145° onlay RSA-the onlay group (OG), and a medial humerus/lateral glenoid 155° inlay RSA-the inlay group (IG). Patients were matched 1:1 by age, gender, indication, preoperative range of motion (ROM), and Constant score. The ROM and Constant scores were assessed preoperatively and at a minimum follow-up of two years. (3) Results: Forty-seven patients have been included (23 in OG and 24 in IG). Postoperative external rotation increased significantly in the OG only (p = 0.049), and its postoperative value was significantly greater than that of the IG by 11.1° (p = 0.028). (4) Conclusion: The use of a lateralized humeral stem with a low neck-shaft angle resulted in significantly improved external rotation compared to a medialized humeral 155° stem, even in cases of severe fatty infiltration of the infraspinatus and teres minor. Humeral lateralization and a low neck-shaft angle should be favored when planning an RSA in a patient without a functional posterior rotator cuff.
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Affiliation(s)
- Marko Nabergoj
- Valdoltra Orthopaedic Hospital, 6280 Ankaran, Slovenia; (M.N.); (R.T.)
- Faculty of Medicine, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia
| | - Shinzo Onishi
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan;
| | - Alexandre Lädermann
- Division of Orthopaedics and Trauma Surgery, La Tour Hospital, 1217 Meyrin, Switzerland
- Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
- Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, 1205 Geneva, Switzerland
- Correspondence: ; Tel.: +41-22-719-75-55
| | - Houssam Kalache
- Hôpital Saint-Camille, 2 Rue des Pères Camilliens, 94360 Bry-sur-Marne, France;
| | - Rihard Trebše
- Valdoltra Orthopaedic Hospital, 6280 Ankaran, Slovenia; (M.N.); (R.T.)
- Faculty of Medicine, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia
| | - Hugo Bothorel
- Research Department, La Tour Hospital, 1217 Meyrin, Switzerland;
| | - Philippe Collin
- Clinique Victor Hugo 5 Bis Rue du Dôme, 75116 Paris, France;
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The effect of glenosphere lateralization and inferiorization on deltoid force in reverse total shoulder arthroplasty. J Shoulder Elbow Surg 2021; 30:1817-1826. [PMID: 33290849 DOI: 10.1016/j.jse.2020.10.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/21/2020] [Accepted: 10/30/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND A medialized center of rotation (COR) in reverse total shoulder arthroplasty (RTSA) comes with limitations such as scapular notching and reduced range of motion. To mitigate these effects, lateralization and inferiorization of the COR are performed, but may adversely affect deltoid muscle force. The study purposes were to measure the effect of RTSA with varying glenosphere configurations on (1) the COR and (2) deltoid force compared with intact shoulders and shoulders with massive posterosuperior rotator cuff tears (PS-RCT). We hypothesized that the highest deltoid forces would occur in shoulders with PS-RCT, and that RTSA would lead to a decrease in required forces that is further minimized with lateralization and inferiorization of the COR but still higher compared with native shoulders with an intact rotator cuff. METHODS In this study, 8 cadaveric shoulders were dissected leaving only the rotator cuff muscles and capsule intact. A custom apparatus incorporating motion capture and a dynamic tensile testing machine to measure the changes in COR and deltoid forces while simultaneously recording glenohumeral abduction was designed. Five consecutive testing states were tested: (1) intact shoulder, (2) PS-RCT, (3) RTSA with standard glenosphere, (4) RTSA with 4 mm lateralized glenosphere, and (5) RTSA with 2.5 mm inferiorized glenosphere. Statistical Parametric Mapping was used to analyze the deltoid force as a function of the abduction angle. One-way repeated-measures within-specimens analysis of variance was conducted, followed by post hoc t-tests for pairwise comparisons between the states. RESULTS All RTSA configurations shifted the COR medially and inferiorly with respect to native (standard: 4.2 ± 2.1 mm, 19.7 ± 3.6 mm; 4 mm lateralized: 3.9 ± 1.2 mm, 16.0 ± 1.8; 2.5 mm inferiorized: 6.9 ± 0.9 mm, 18.9 ± 1.7 mm). Analysis of variance showed a significant effect of specimen state on deltoid force across all abduction angles. Of the 10 paired t-test comparisons made between states, only 3 showed significant differences: (1) intact shoulders necessitated significantly lower deltoid force than specimens with PS-RCT below 42° abduction, (2) RTSAs with standard glenospheres required significantly lower deltoid force than RTSA with 4 mm lateralized glenospheres above 34° abduction, and (3) RTSAs with 2.5 mm inferiorized glenospheres had significantly lower deltoid force than RTSA with 4 mm of glenosphere lateralization at higher abduction angles. CONCLUSIONS RTSA with a 2.5 mm inferiorized glenosphere and no additional lateralization resulted in less deltoid force to abduct the arm compared with 4 mm lateralized glenospheres. Therefore, when aiming to mitigate downsides of a medialized COR, an inferiorized glenosphere may be preferable in terms of its effect on deltoid force.
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19
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Corona K, Cerciello S, Ciolli G, Proietti L, D’Ambrosi R, Braile A, Toro G, Romano AM, Ascione F. Clinical Outcomes and Joint Stability after Lateralized Reverse Total Shoulder Arthroplasty with and without Subscapularis Repair: A Meta-Analysis. J Clin Med 2021; 10:jcm10143014. [PMID: 34300180 PMCID: PMC8307830 DOI: 10.3390/jcm10143014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 06/28/2021] [Accepted: 07/01/2021] [Indexed: 12/01/2022] Open
Abstract
Introduction: Subscapularis tendon repair in reverse total shoulder arthroplasty represents a potentially modifiable risk factor for dislocation, and its role continues to be debated. The purpose of the present meta-analysis was to compare the outcomes of the primary lateralized RSAs with and without subscapularis repair in terms of range of motion, clinical outcomes, dislocations, and complications rate. Materials and Methods: A systematic literature search in MEDLINE (Pubmed), Embase, and the Cochrane Central Register of Controlled Trials database was carried up to December 2020. A data extraction form was developed to collect select data from the included studies. The methodological quality was assessed using a Methodological Index for Nonrandomized Studies (MINORS) score. Statistical analysis was performed with Review Manager (Version 5.4, The Cochrane Collaboration). Results: A total of four comparative studies involving 978 patients were included. In the pooled analysis, the reinsertion of the subscapularis yielded better functional outcomes in terms of the constant (P < 0.00001) and ASES (P = 0.002) scores. The forward elevation, external rotation at 0°, internal rotation, and dislocation rates were comparable between the two groups (P = n.s.), while statistically increased abduction was observed in those patients who did not have their subscapularis repaired (P < 0.00001). Conclusion: The results of the present findings suggest that it seems reasonable to reinsert the subscapularis whenever it is present, in good tissue conditions, and with no evidence of fatty degeneration of its muscle belly. Level of evidence: Level III meta-analysis
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Affiliation(s)
- Katia Corona
- Department of Medicine and Health Sciences “Vincenzo Tiberio”, University of Molise, Via Giovanni Paolo II, 86100 Campobasso, Italy
- Correspondence:
| | - Simone Cerciello
- Department of Orthopaedics, Agostino Gemelli University Hospital Foundation IRCCS, Catholic University, 00168 Rome, Italy; (S.C.); (G.C.)
- Casa di Cura Villa Betania, 00165 Rome, Italy;
- Marrelli Hospital, 88900 Crotone, Italy
| | - Gianluca Ciolli
- Department of Orthopaedics, Agostino Gemelli University Hospital Foundation IRCCS, Catholic University, 00168 Rome, Italy; (S.C.); (G.C.)
| | | | | | - Adriano Braile
- Multidisciplinary Department of Medico-Surgical and Dentistry Specialties, University “Campana Luigi Vanvitelli”, 81100 Napoli, Italy; (A.B.); (G.T.)
| | - Giuseppe Toro
- Multidisciplinary Department of Medico-Surgical and Dentistry Specialties, University “Campana Luigi Vanvitelli”, 81100 Napoli, Italy; (A.B.); (G.T.)
| | - Alfonso Maria Romano
- Department of Orthopaedic and Trauma Surgery, Ospedale Buon Consiglio Fatebenefratelli, 80123 Napoli, Italy; (A.M.R.); (F.A.)
- Orthopedics and Sport Medicine Unit, Campolongo Hospital, 84127 Salerno, Italy
| | - Francesco Ascione
- Department of Orthopaedic and Trauma Surgery, Ospedale Buon Consiglio Fatebenefratelli, 80123 Napoli, Italy; (A.M.R.); (F.A.)
- Orthopedics and Sport Medicine Unit, Campolongo Hospital, 84127 Salerno, Italy
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Factors Influencing Appropriate Implant Selection and Position in Reverse Total Shoulder Arthroplasty. Orthop Clin North Am 2021; 52:157-166. [PMID: 33752837 DOI: 10.1016/j.ocl.2020.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Reverse shoulder arthroplasty has increased in popularity and has provided improved but somewhat variable results. These variable outcomes may be related to many factors, including implant design, component positioning, specific indication, and patient anatomy. The original Grammont design provided a solution to the high failure rate at the time but was found to have a high rate of scapular notching and poor restoration of rotation. Modern lateralized designs are more consistent in reducing scapular notching while improving range of motion, especially in regards to external rotation. This review article summarizes the effects of modern reverse shoulder prostheses on outcomes.
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Chan K, Langohr GDG, Welsh M, Johnson JA, Athwal GS. Latissimus dorsi tendon transfer in reverse shoulder arthroplasty: transfer location affects strength. JSES Int 2021; 5:277-281. [PMID: 33681849 PMCID: PMC7910727 DOI: 10.1016/j.jseint.2020.10.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Background The optimal insertion location of a latissimus dorsi tendon transfer to restore external rotation after reverse shoulder arthroplasty (RSA) is not well established. The aim of this biomechanical study was to determine the effect of tendon transfer location on external rotation torque, in conjunction with varying RSA humeral component lateralization. We hypothesized that proximal tendon transfers, along with increasing humeral lateralization, would maximize external rotation torque. Methods Eight fresh-frozen cadaveric shoulders underwent RSA and were tested on an in vitro shoulder simulator. A latissimus dorsi tendon transfer was tested at three insertion locations (lateral greater tuberosity [Lat-GT]; teres minor footprint [Tm-FP]; lateral shaft [Lat-Shft]), and external rotation torque was measured. Additional test conditions included varying humeral component lateralization (-5, 0, +5, +10, +15 mm), abduction angle (0°, 45°, 90°), and internal/external rotation (-60°, -30°, 0°, 30°, 60°). Results The Lat-GT and Tm-FP insertions of the latissimus dorsi transfer both generated significantly greater torques (P < .001) than the Lat-Shft. When comparing Lat-GT to Tm-FP, there were no significant differences (P = .362). At 60˚ of external rotation, RSA humeral component lateralization from -5 to +15 mm significantly increased the external rotation torque of Lat-GT by 67% (P = .035), Tm-FP by 43% (P = .001), and of Lat-Shft by 42% (P = .002). Conclusion Latissimus dorsi tendon transfer to the proximal lateral aspect of the greater tuberosity and to the insertion site of the teres minor generated significantly more external rotation torque than transfer to the lateral humeral shaft. In addition, the use of a humeral component with greater offset also substantially increases the torque generated by the tendon transfer.
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Affiliation(s)
- Kevin Chan
- Roth/McFarlane Hand and Upper Limb Centre, St Joseph's Health Care, University of Western Ontario, London, ON, Canada
| | - G Daniel G Langohr
- Roth/McFarlane Hand and Upper Limb Centre, St Joseph's Health Care, University of Western Ontario, London, ON, Canada
| | - Mark Welsh
- Roth/McFarlane Hand and Upper Limb Centre, St Joseph's Health Care, University of Western Ontario, London, ON, Canada
| | - James A Johnson
- Roth/McFarlane Hand and Upper Limb Centre, St Joseph's Health Care, University of Western Ontario, London, ON, Canada
| | - George S Athwal
- Roth/McFarlane Hand and Upper Limb Centre, St Joseph's Health Care, University of Western Ontario, London, ON, Canada
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22
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Kerrigan AM, Reeves JM, Langohr GDG, Johnson JA, Athwal GS. The influence of reverse arthroplasty humeral component design features on scapular spine strain. J Shoulder Elbow Surg 2021; 30:572-579. [PMID: 32621980 DOI: 10.1016/j.jse.2020.06.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/25/2020] [Accepted: 06/08/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND Reverse shoulder arthroplasty (RSA) humeral implant parameters have been previously studied with respect to range of motion, deltoid function, and stability. However, limited literature exists on the influence of humeral design features on scapular spine strain. The purpose of this cadaveric biomechanical simulator study was to evaluate the role of humeral component lateralization and neck-shaft angle (NSA) on scapular spine strain. METHODS Eight fresh-frozen cadaveric shoulders were tested using an in vitro shoulder simulator. A custom-designed modular RSA system was implanted that allowed for the in situ adjustment of humeral lateralization and NSA. Scapular spine strain was measured by strain gauges placed along the acromion and scapular spine in clinically relevant positions representative of the Levy fracture zones. All testing was conducted in both abduction and forward elevation. RESULTS In Levy zones 2 and 3, increasing humeral lateralization caused significant incremental decreases in scapular spine strain at 0° and 90° abduction (P < .042). Strain decreases as high as 34% were noted with increases in humeral lateralization from -5 to 15 mm (P = .042). Changing NSA had no statistically significant effect on scapular spine strain (P > .14). CONCLUSIONS Some humeral implant design features in RSA have effects on scapular spine strain. Humeral component lateralization had significant effects, whereas adjusting NSA resulted in no substantial differences in scapular spine strain. Understanding humeral component variables is important to allow for design optimization of future RSA implants.
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Affiliation(s)
- Alicia M Kerrigan
- Investigations conducted at the Bioengineering Laboratory at the Roth
- McFarlane Hand and Upper Limb Centre, St. Joseph's Hospital, London, ON, Canada
| | - Jacob M Reeves
- Investigations conducted at the Bioengineering Laboratory at the Roth
- McFarlane Hand and Upper Limb Centre, St. Joseph's Hospital, London, ON, Canada
| | - G Daniel G Langohr
- Investigations conducted at the Bioengineering Laboratory at the Roth
- McFarlane Hand and Upper Limb Centre, St. Joseph's Hospital, London, ON, Canada
| | - James A Johnson
- Investigations conducted at the Bioengineering Laboratory at the Roth
- McFarlane Hand and Upper Limb Centre, St. Joseph's Hospital, London, ON, Canada
| | - George S Athwal
- Investigations conducted at the Bioengineering Laboratory at the Roth
- McFarlane Hand and Upper Limb Centre, St. Joseph's Hospital, London, ON, Canada.
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23
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Kwapisz A, Rogers JP, Thigpen CA, Shanley E, Newton E, Adams KJ, Alexander R, Hawkins RJ, Kissenberth MJ, Tokish JM, Pill SG. Infraspinatus or teres minor fatty infiltration does not influence patient outcomes after reverse shoulder arthroplasty with a lateralized glenoid. JSES Int 2021; 5:109-113. [PMID: 33554175 PMCID: PMC7846691 DOI: 10.1016/j.jseint.2020.09.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Background Previous studies show that reverse shoulder arthroplasty (RSA) may improve forward elevation (FE) but external rotation may remain impaired with substantial teres minor fatty infiltration. The purpose of this study was to examine the influence of fatty infiltration on postoperative range of motion (ROM) and patient-reported outcomes (PROs) after RSA with a more lateralized center of rotation. Methods About 69 patients (average age 69 years; 44 women, 25 men) with preoperative MRI, 1-year postoperative ROM, 2-year Veteran's Rand Survey, American Shoulder and Elbow Surgeons subjective form, and Single Alpha-Numeric Evaluation scores who underwent RSA with a lateralized glenoid component between 2010 and 2014 were identified. Patients with Fuchs stage 3 fatty degeneration were compared with patients with Fuchs stage ≤ 2 using a one-way ANOVA. Results Eleven patients had Fuchs stage 3 in the teres minor and 28 with stage 3 in the infraspinatus. Charlson comorbidity indices, Veteran's Rand Survey scores, age, and BMI were not different between groups. There were no differences after one year (follow-up = 15 ± 14 months) in FE (FE = 128 ± 29) or external rotation (33 ± 13) between groups. There were no differences in two-year minimum (follow-up = 42.9 ± 17.9 months) American Shoulder and Elbow Surgeons scores between degenerated teres minor (76.4 ± 20) or infraspinatus (69.1 ± 24) groups. Conclusion This is the first study to assess the influence of teres minor and infraspinatus fatty infiltration on the postoperative ROM and PROs with a more lateralized glenoid RSA implant. Our results show that in a more lateralized RSA, neither teres minor nor infraspinatus fatty infiltration appear to negatively influence ROM or PROs.
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Affiliation(s)
- Adam Kwapisz
- Hawkins Foundation, Greenville, SC, USA.,Clinic of Orthopaedics and Pediatric Orthopedics, Medical University of Łódź, Łódź, Poland
| | - Jason P Rogers
- Steadman Hawkins Clinic of the Carolinas, Prisma Health-Upstate, Greenville, SC, USA
| | | | | | | | | | | | | | - Michael J Kissenberth
- Steadman Hawkins Clinic of the Carolinas, Prisma Health-Upstate, Greenville, SC, USA
| | | | - Stephan G Pill
- Steadman Hawkins Clinic of the Carolinas, Prisma Health-Upstate, Greenville, SC, USA
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24
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Offset in Reverse Shoulder Arthroplasty: Where, When, and How Much. J Am Acad Orthop Surg 2021; 29:89-99. [PMID: 33264136 DOI: 10.5435/jaaos-d-20-00671] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/05/2020] [Indexed: 02/01/2023] Open
Abstract
Since the advent of Paul Grammont medialized reverse shoulder prosthesis in the 1980s, shoulder surgeons have had a reliable option for treating glenohumeral joint disease in the rotator cuff-deficient shoulder. However, the prosthesis is not without complications, including scapular notching, instability, and limited rotational motion. Implants have been modified from the original design in an effort to reduce the risk of these complications. Increasing the offset, or lateralization, of the glenosphere may reduce the rate of scapular notching, reduce impingement, increase stability, and improve rotational motion. However, a more lateralized glenosphere could lead to baseplate loosening, decreased deltoid efficiency, and increased risk of acromial fracture. Increasing the offset on the humeral side, rather than the glenosphere side, may be able to reduce the rate of scapular notching and improve rotational motion without an increased risk of baseplate loosening. Humeral lateralization also improves tension of the rotator cuff and maintains good deltoid efficiency. However, humeral lateralization provides little stability benefit, and acromial fracture remains a risk. Ultimately, the surgeon must be familiar with the implants he or she is using and the options for both glenosphere and humeral lateralization to ensure that risks and benefits can be weighed for each patient.
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25
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Parry S, Stachler S, Mahylis J. Lateralization in reverse shoulder arthroplasty: A review. J Orthop 2020; 22:64-67. [PMID: 32280171 DOI: 10.1016/j.jor.2020.03.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 03/22/2020] [Indexed: 11/16/2022] Open
Abstract
Reverse shoulder arthroplasty, as originally designed by Grammont, has revolutionized the treatment of rotator cuff arthropathy as well as fractures about the proximal humerus. The original design consisted of glenoid and humeral components with a medialized center or rotation compared to the native shoulder. Long term outcome studies on this design demonstrated high rates of scapular notching as well as significant loss of external rotation. To combat these flaws, prosthesis design has evolved to include the concept of lateralization whereby the center of rotation is moved laterally compared to the Grammont prosthesis via either the glenoid or humeral components. Lateralization via the glenoid component has sought to reduce scapular notching, however, concerns over early loosening have been raised secondary to increasing stress at the glenosphere/glenoid interface. Lateralization via the humeral component has been theorized to improve the mechanics of the remaining rotator cuff and deltoid musculature while avoiding the problems inherent with glenoid lateralization. While limited clinical evidence is available currently to support one design over the other, multiple biomechanical studies have shown improvements in rates of scapular notching and post-operative external rotation for lateralized humeral and glenoid components. Future research should aim to delineate advantages of one design over the other or optimal combinations of the two designs.
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Affiliation(s)
- Steve Parry
- Department of Orthopaedics, Midwestern University/Franciscan Health-Olympia Fields, 20202 S, Crawford Ave, Olympia Fields, IL, 60461, USA
| | - Shawn Stachler
- Tier 1 Orthopedic and Neurosurgical Institute, 105 South Willow Avenue, Cookeville, TN, 38501, USA
| | - Jared Mahylis
- Department of Orthopaedics, Midwestern University/Franciscan Health-Olympia Fields, 20202 S, Crawford Ave, Olympia Fields, IL, 60461, USA
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26
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Elwell JA, Athwal GS, Willing R. Development and Application of a Novel Metric to Characterize Comprehensive Range of Motion of Reverse Total Shoulder Arthroplasty. J Orthop Res 2020; 38:880-887. [PMID: 31696954 PMCID: PMC7071975 DOI: 10.1002/jor.24518] [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] [Received: 02/08/2019] [Accepted: 10/25/2019] [Indexed: 02/04/2023]
Abstract
Active range of motion (ROM) of reverse total shoulder arthroplasty (rTSA) can be limited by bony impingement, muscle inability, and joint instability. The aim of this study was to develop a novel metric representative of comprehensive ROM of rTSA, which is evaluated in the context of all three factors. It was hypothesized that the metric, termed global circumduction ROM (GC-ROM), would capture differences resulting from directional changes in rTSA design parameters known to increase ROM. GC-ROM was calculated for a set of 18 rTSA configurations with humeral polyethylene cup depths of 6 and 8.1 mm, glenosphere lateralization (GLat) distances of 0, 5, and 10 mm, and neck-shaft angles (NSA) of 135°, 145°, and 155°. For any implant configuration, arm positions were defined by internal/external (IE) rotation angle and two spherical coordinates representing the elevation plane angle and elevation angle. At each IE rotation angle, incremental positions with variable elevation plane and elevation angles were checked for feasibility based on impingement, muscle ability, and risk of instability. Coordinates of feasible positions were mapped to unit spheres and connected to form regions, of which the surface area was calculated to represent allowable circumduction ROM. ROMs were averaged across all IE rotation angles to produce a single metric, GC-ROM. The results showed that decreasing cup depth and increasing GLat and NSA increased GC-ROM. In conclusion, a novel metric to characterize comprehensive ROM, evaluated based on several ROM-limiting factors, was developed as a performance metric through which rTSA designs can be compared. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:880-887, 2020.
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Affiliation(s)
- Josie A. Elwell
- Department of Mechanical Engineering, Thomas J. Watson School of Engineering and Applied Science, State University of New York at Binghamton, Binghamton, New York, USA
| | - George S. Athwal
- Roth McFarlane Hand and Upper Limb Centre, London, Ontario, CANADA
| | - Ryan Willing
- Department of Mechanical Engineering, Thomas J. Watson School of Engineering and Applied Science, State University of New York at Binghamton, Binghamton, New York, USA,Department of Mechanical Engineering and Materials Engineering, The University of Western Ontario, London, Ontario, CANADA,Corresponding Author: Ryan Willing, Ph.D., Assistant Professor, Department of Mechanical Engineering and Materials Engineering, The University of Western Ontario, 1151 Richmond Street N., London, Ontario, Canada N6A 5B9, Telephone: (519) 661-2111 x80295, Fax: (519) 661-3020,
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27
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Eno JJT, Kontaxis A, Novoa-Boldo A, Windsor E, Chen X, Erickson BJ, Warren RF, Dines DM, Dines JS, Gulotta LV, Taylor SA. The biomechanics of subscapularis repair in reverse shoulder arthroplasty: The effect of lateralization and insertion site. J Orthop Res 2020; 38:888-894. [PMID: 31743476 DOI: 10.1002/jor.24531] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 10/14/2019] [Indexed: 02/04/2023]
Abstract
Functional outcomes of subscapularis (SSc) repair following reverse shoulder arthroplasty (RSA) remains controversial. SSc repair in combination with glenosphere lateralization was reported to yield worse clinical outcomes compared with the non-lateralized glenosphere. The aim of this biomechanical study was to investigate how glenosphere lateralization and different re-insertion sites can affect the biomechanics of the SSc after RSA. Nine patient-specific RSA shoulder models were created from patients' computed tomography scans. Moment arms and SSc length were calculated for abduction, forward flexion, and internal rotation in 20° and 90° abduction for three configurations of glenosphere lateralization (standard/+0, +5, and +10 mm) and three SSc repair sites (native, superior, and inferior) and compared with the native shoulder. When compared with the native shoulder, RSA resulted in large adducting SSc moment arms that were antagonistic to the deltoid. Glenosphere lateralization had no effect on SSc moment arms in any motion. However, lateralization increased SSc tension beyond its anatomic length for +5 and +10 mm of lateralization when attached to its native insertion. A superior SSc repair site created the least adductive moment arm as well as the least amount of SSc lengthening. Increased glenosphere lateralization showed a significant increase in the SSc length, which in combination with its adductive moment arm can be antagonistic to deltoid function. However, a superior SSc repair site may help reduce the adductive SSc moment arm and allow for reduced tension on the repair as its length in that location is less than that of the native SSc. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:888-894, 2020.
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Affiliation(s)
- Jonathan-James T Eno
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Andreas Kontaxis
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Alejandro Novoa-Boldo
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Eric Windsor
- Georgetown University School of Medicine, 3900 Reservoir Rd NW, Washington, District of Columbia, 20007
| | - Xiang Chen
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Brandon J Erickson
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Russell F Warren
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - David M Dines
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Joshua S Dines
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Lawrence V Gulotta
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
| | - Samuel A Taylor
- Department of Sports Medicine and Shoulder Surgery, Hospital for Special Surgery, New York, New York, 10021
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28
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Lädermann A, Denard PJ, Collin P, Zbinden O, Chiu JCH, Boileau P, Olivier F, Walch G. Effect of humeral stem and glenosphere designs on range of motion and muscle length in reverse shoulder arthroplasty. INTERNATIONAL ORTHOPAEDICS 2020; 44:519-530. [PMID: 31900574 DOI: 10.1007/s00264-019-04463-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Accepted: 12/06/2019] [Indexed: 01/27/2023]
Abstract
PURPOSE To determine how different combinations of humeral stem and glenosphere designs for reverse shoulder arthroplasty (RSA) influence range of motion (ROM) and muscle elongation. METHODS A computed tomography scan of a non-pathologic shoulder was used to simulate all shoulder motions, and thereby compare the ROM and rotator cuff muscle lengths of the native shoulder versus 30 combinations of humeral components (1 inlay straight stem with 155° inclination and five onlay curved stems with 135°, 145° or 155° inclinations, using concentric, medialized or lateralized trays) and glenospheres (standard, large, lateralized, inferior eccentric and bony increased-offset (BIO-RSA)). RESULTS Only five of the 30 combinations restored ≥ 50% of the native ROM in all directions: the 145° onlay stem (concentric tray) combined with lateralized or inferior eccentric glenospheres and the 145° stem (lateralized tray) combined with either a large, lateralized or inferior eccentric glenosphere. Lengthening of the supraspinatus and infraspinatus, observed for all configurations, was greatest using onlay stems (7-30%) and BIO-RSA glenospheres (13-31%). Subscapularis lengthening was observed for onlay stems combined with BIO-RSA glenospheres (5-9%), while excessive subscapularis shortening was observed for the inlay stem combined with all glenospheres except the BIO-RSA design (> 15%). CONCLUSIONS The authors suggest implanting 145° onlay stems, with concentric or lateralized trays, together with lateralized or inferior eccentric glenospheres.
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Affiliation(s)
- Alexandre Lädermann
- Division of Orthopaedics and Trauma Surgery, La Tour Hospital, Meyrin, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland
- Division of Orthopaedics and Trauma Surgery, Hirslanden Clinique La Colline, Geneva, Switzerland
| | - Patrick J Denard
- Southern Oregon Orthopedics, Medford, OR, USA
- Department of Orthopaedics and Rehabilitation, Oregon Health & Science University, Portland, OR, USA
| | - Philippe Collin
- Centre Hospitalier Privé Saint-Grégoire (Vivalto Santé), Saint-Grégoire, France
| | - Olivia Zbinden
- Service of Orthopedics and Traumatology, Lausanne University Hospital, Lausanne, Switzerland
| | - Joe Chih-Hao Chiu
- Department of Orthopaedic Sports Medicine, Chang Gung Memorial Hospital, Taoyuan City, Taiwan
| | - Pascal Boileau
- iULS (Institut Universitaire Locomoteur et du Sport), Hôpital Pasteur 2, University Côte d'Azur, Nice, France
| | - Flora Olivier
- ReSurg SA, Rue Saint-Jean 22, 1260, Nyon, Switzerland.
| | - Gilles Walch
- Centre Orthopédique Santy, Hôpital Privé Jean Mermoz Ramsay GDS, Lyon, France
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29
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Abstract
PURPOSE OF REVIEW Our understanding of the reverse total shoulder arthroplasty (RTSA) has grown exponentially since Grammont first introduced his design in 1985. There are a multitude of implant-related variables to consider when performing RTSA. The purpose of this article is to provide a review of these design considerations. RECENT FINDINGS Current literature demonstrates that the traditional Grammont prosthesis has over 90% survivorship at 10 years. Despite these promising results, there have been concerns raised over the significant rate of scapular notching observed. As a result, the traditional RTSA design has been modified to minimize this complication and maximize impingement-free motion. Modern RTSA designs with a cementless, curved, short-stemmed eccentric onlay humeral component combined with a large, lateralized glenosphere placed in 10° of inferior tilt with > 3.5 mm of inferior overhang have been found to provide excellent results. However, all implant design features must be considered on a case-by-case basis to optimize outcome for each patient. Humeral and glenoid implant design variables have evolved as the biomechanics of RTSA have been further elucidated. Consideration of these variables allows the surgeon to maximize joint efficiency, improve impingement-free range of motion, decrease the risk of scapular notching, preserve bone stock, and minimize the risk of instability.
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Affiliation(s)
- Ujash Sheth
- Department of Orthopaedic Surgery, Northwestern University, 259 East Erie, 13th Floor, Chicago, IL, 60611, USA.
| | - Matthew Saltzman
- Department of Orthopaedic Surgery, Northwestern University, 259 East Erie, 13th Floor, Chicago, IL, 60611, USA
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30
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Matthewson G, Kooner S, Kwapisz A, Leiter J, Old J, MacDonald P. The effect of subscapularis repair on dislocation rates in reverse shoulder arthroplasty: a meta-analysis and systematic review. J Shoulder Elbow Surg 2019; 28:989-997. [PMID: 30827833 DOI: 10.1016/j.jse.2018.11.069] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 11/19/2018] [Accepted: 11/30/2018] [Indexed: 02/01/2023]
Abstract
BACKGROUND Reverse total shoulder arthroplasty is an effective treatment for patients with rotator cuff arthropathy; however, complication rates are relatively high (19%-50%), with implant instability and infection being particularly devastating to overall outcomes. The objective of this study was to analyze the highest level of data comparing dislocation rates and outcomes in reverse total shoulder arthroplasty with and without the subscapularis tendon repaired. METHODS The databases MEDLINE, Embase, and CINAHL were searched using a sensitive search strategy for this meta-analysis/systematic review. Eligibility included any studies in which patients were treated with a reverse total shoulder arthroplasty in which the status of the subscapularis tendon could be determined. A data extraction form was developed to collect select data from the included studies. A meta-analysis was performed on pooled data of 5 studies comparing dislocation rates and 3 studies comparing postoperative forward elevation, rate of infection, overall complication rates, and fractures. RESULTS Two independent researchers reviewed 1008 studies. Seven studies met inclusion criteria. A meta-analysis was performed on all level III studies, resulting in 1306 patients being analyzed. Results demonstrated lower dislocation rates in the subscapularis repair group (odds ratio, 0.19; P < .001). However, in patients without a subscapularis repair, lateralized center of rotation (COR) resulted in a significantly lower dislocation rate compared with medialized COR (odds ratio, 0.24; P < .001). CONCLUSION The results of our meta-analysis of the available data demonstrated a decrease in dislocation risk when the subscapularis tendon was repaired in medialized and lateralized designs. When subscapularis repair is not performed, lateralized COR, regardless of humeral socket design, may reduce the dislocation rates.
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Affiliation(s)
- Graeme Matthewson
- Orthopaedic Surgery, Pan Am Clinic, University of Manitoba, Winnipeg, MB, Canada.
| | - Sahil Kooner
- Orthopaedic Surgery, University of Calgary, Calgary, AB, Canada
| | - Adam Kwapisz
- Orthopaedic Surgery, Pan Am Clinic, University of Manitoba, Winnipeg, MB, Canada; Clinic of Orthopedics and Pediatric Orthopedics, Medical University of Lodz, Poland
| | - Jeff Leiter
- Orthopaedic Surgery, Pan Am Clinic, University of Manitoba, Winnipeg, MB, Canada
| | - Jason Old
- Orthopaedic Surgery, Pan Am Clinic, University of Manitoba, Winnipeg, MB, Canada
| | - Peter MacDonald
- Orthopaedic Surgery, Pan Am Clinic, University of Manitoba, Winnipeg, MB, Canada
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31
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Kazley JM, Cole KP, Desai KJ, Zonshayn S, Morse AS, Banerjee S. Prostheses for reverse total shoulder arthroplasty. Expert Rev Med Devices 2019; 16:107-118. [DOI: 10.1080/17434440.2019.1568237] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
| | - Keegan P. Cole
- Orthopaedic Surgery, Albany Medical Center, Albany, NY, USA
| | | | | | | | - Samik Banerjee
- Orthopaedic Surgery, Albany Medical Center, Albany, NY, USA
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32
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Geometric modification of the humeral position after total reverse shoulder arthroplasty: what is the optimal lowering of the humerus? J Shoulder Elbow Surg 2018; 27:2207-2213. [PMID: 30041944 DOI: 10.1016/j.jse.2018.05.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Revised: 05/03/2018] [Accepted: 05/13/2018] [Indexed: 02/01/2023]
Abstract
BACKGROUND The main mechanical effect after reverse shoulder arthroplasty (RSA) is the lowering of the glenohumeral rotation center. The optimal value of the humeral lowering after RSA is still debated. The main objective of our study was to determine the lowering and medialization of the humerus and to correlate these parameters with short-term functional results. MATERIALS AND METHODS The study included 70 patients with complete radiographic and clinical data. A multivariate analysis was used to compare the clinical and radiographic outcomes with the humeral lowering. RESULTS The mean humeral lowering was 25.4 mm (range, 6-38 mm), and the mean medialization was 9.2 mm (range, 0-20 mm). Humeral lowering significantly influenced active forward elevation and the rate of scapular notching. DISCUSSION The best clinical results and the lowest incidence of scapular notching were found after a lowering of more than 24 mm in our series. We recommend humeral lengthening of at least 24 mm after implanting a total reverse shoulder prosthesis.
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33
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Warme WJ. CORR Insights ®: Revision to Reverse Total Shoulder Arthroplasty Restores Stability for Patients With Unstable Shoulder Prostheses. Clin Orthop Relat Res 2017; 475:2723-2725. [PMID: 28940027 PMCID: PMC5638760 DOI: 10.1007/s11999-017-5491-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 08/29/2017] [Indexed: 01/31/2023]
Affiliation(s)
- Winston J. Warme
- Department of Orthopaedic Surgery, University of Washington, Seattle, WA 98195-6500 USA
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