scholarly journals Radiologic Comparison of Humeral Position according to the Implant Designs Following Reverse Shoulder Arthroplasty: Analysis between Medial Glenoid/Medial Humerus, Lateral Glenoid/Medial Humerus, and Medial Glenoid/Lateral Humerus Designs

2018 ◽  
Vol 21 (4) ◽  
pp. 192-199
Author(s):  
Nam Su Cho ◽  
Ju Hyun Nam ◽  
Se Jung Hong ◽  
Tae Wook Kim ◽  
Myeong Gu Lee ◽  
...  
Keyword(s):  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Center Of Rotation ◽  
Group A ◽  
Acromiohumeral Distance ◽  
Group B ◽  
Humeral Offset

BACKGROUND: The currently available reverse shoulder arthroplasty (RSA) designs can be classified into medial glenoid/medial humerus (MGMH), lateral glenoid/medial humerus (LGMH), and medial glenoid/lateral humerus (MGLH) prosthesis designs. The purpose of this study was to radiologically analyze the effect of different RSA designs on humeral position following RSA.METHODS: A total of 50 patients who underwent primary RSA were retrospectively analyzed. Among 50 patients, 33 patients (group A: MGMH) underwent RSA with Aequalis system (Wright, Inc, Bloomington, MN, USA), 6 (group B: LGMH) with Aequalis system using bony increased offset, and 11 (group C: MGLH) with Aequalis Ascend Flex system. The acromiohumeral distance, acromioepiphyseal distance (AED), lateral humeral offset (LHO), LHO from the center of rotation (LHO(COR)), and deltoid length were radiologically measured to quantify the distalization and lateralization of the humerus.RESULTS: The increment in postoperative AED was 19.92 ± 3.93 mm in group A, 24.52 ± 5.25 mm in group B, and 25.97 ± 5.29 mm in group C, respectively (p=0.001). The increment in postoperative LHO was 0.13 ± 6.30 mm, 8.00 ± 12.14 mm, and 7.42 ± 6.88 mm, respectively (p=0.005). The increment in postoperative LHOCOR was 20.76 ± 6.06 mm, 22.04 ± 5.15 mm, and 28.11 ± 4.14 mm, respectively (p=0.002).CONCLUSIONS: The radiologic analysis of the effect of different RSA designs on humeral position following RSA showed significant differences in the increment in postoperative AED, LHO, and LHO(COR) between the 3 groups. Therefore, MGLH design seems to be more effective for humeral distalization and lateralization compared to original Grammont design.

The effect of load and plane of elevation on acromial stress after reverse shoulder arthroplasty

2020 ◽  
pp. 175857322091009
Author(s):  
Jason S Lockhart ◽  
Murray T Wong ◽  
G Daniel G Langohr ◽  
George S Athwal ◽  
James A Johnson
Keyword(s):  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Finite Element Models ◽  
Stress Distributions ◽  
Science Study ◽  
Level Of Evidence ◽  
Implant Placement ◽  
Basic Science Study ◽  
Humeral Offset ◽  
Tomography Data

Background Acromial fractures are a substantial complication following reverse shoulder arthroplasty, reported to affect up to 7% of patients. Previous studies have shown that implant placement affects acromial stress during elevation of the arm in the scaption plane. The purpose of this study was to investigate the results of arm loading and variation in plane of elevation on acromial stresses. Methods Nine elevation angles (0°–120°), in three planes of elevation (abduction (0°), scaption (30°), and forward elevation (60°)), and three hand loads (0, 2.5, 5 kg) were investigated. Finite element models were generated using computed tomography data from 10 cadaveric shoulders (age 68 ± 19 yrs) to determine acromial stress distributions. Models were created for a lateralized glenosphere (0, 5, 10 mm), inferiorized glenosphere (0, 2.5, 5 mm), and humeral offset (−5, 0, 5 mm). Results For all planes of elevation (0°, 30°, 60°) and hand loads (0, 2.5, 5 kg) investigated, glenoid lateralization consistently increased acromial stress, glenoid inferiorization consistently decreased acromial stress, and humeral offset proved to be insignificant in altering acromial stress. Abduction resulted in significantly higher peak acromial stresses (p = 0.002) as compared to scaption and forward elevation. Conclusions In addition to implant position and design, patient activity, such as plane of elevation and hand loads, has substantial effects on acromial stresses. Level of evidence Basic science study

Medialized Versus Lateralized Center of Rotation in Reverse Shoulder Arthroplasty

Orthopedics ◽  
2015 ◽  
Vol 38 (12) ◽  
pp. e1098-e1103 ◽  
Author(s):  
Jonathan J. Streit ◽  
Yousef Shishani ◽  
Reuben Gobezie
Keyword(s):  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Center Of Rotation

Center of Rotation Affects Abduction Range of Motion of Reverse Shoulder Arthroplasty

2007 ◽  
Vol 458 ◽  
pp. 78-82 ◽  
Author(s):  
Sergio Gutiérrez ◽  
Jonathan C Levy ◽  
William E Lee ◽  
Tony S Keller ◽  
Murray E Maitland
Keyword(s):  
Range Of Motion ◽  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Center Of Rotation

The clinical and radiographic impact of center of rotation lateralization in reverse shoulder arthroplasty: a systematic review

2018 ◽  
Vol 27 (11) ◽  
pp. 2099-2107 ◽  
Author(s):  
Joshua K. Helmkamp ◽  
Garrett S. Bullock ◽  
Nnamdi R. Amilo ◽  
Evan M. Guerrero ◽  
Leila S. Ledbetter ◽  
...  
Keyword(s):  
Systematic Review ◽  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Center Of Rotation

scholarly journals Clinically relevant results of reverse total shoulder arthroplasty for patients younger than 65 years compared to the older patients

Arthroplasty ◽  
2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Klaus Hanisch ◽  
Michael Boelstoft Holte ◽  
Inge Hvass ◽  
Niels Wedderkopp
Keyword(s):  
Quality Of Life ◽  
Shoulder Arthroplasty ◽  
Older Patients ◽  
Total Shoulder Arthroplasty ◽  
Reverse Total Shoulder Arthroplasty ◽  
Group A ◽  
The Mean ◽  
Group B ◽  
Reverse Total Shoulder

Abstract Background Reverse total shoulder arthroplasty was originally designed for older patients with rotator cuff arthropathy and produces good results. The main objective of this retrospective study was to compare the patients younger than 65 years vs. the older patients in terms of the complications of reverse total shoulder arthroplasty and the functional recovery. Methods From January 2014 to January 2020, 566 patients who underwent the reverse total shoulder arthroplasty were divided into two groups (group A, ≥ 65 years, n = 506; group B, < 65 years, n = 60). The patients reported the quality of life using the patient-reported Western Ontario Osteoarthritis of the Shoulder index. The Constant score was obtained preoperatively and 3 months postoperatively. The complications and reoperations were compared. Statistical significance was set at P < 0.05. Results Clinically relevant improvements were found in group A and B. There was a multivariate statistically-significant but not clinically relevant difference in the change over time between group A and B. The mean 12-month Western Ontario Osteoarthritis of the Shoulder indexes were 58 in group B and 71 in group A. The mean Constant scores were 44 in group B vs. 43 in group A. Compared to group A, group B had a non-significant odds ratio of 1.9, which did not reach the clinically relevant Western Ontario Osteoarthritis of the Shoulder index of group A. Conclusion In patients younger than 65 years of age, RTSA seems to be a safe procedure in short term follow-up. After 1 year, we found no increased risk of complications, revision, or inferior outcomes compared to patients older than 65 years of age. Consequently, after one-year, RTSA provided clinically relevant improvements in the patients’ quality of life and shoulder strength regardless of age.

An ultrastructural study of sertoli cells in two geographically isolated populations of Aphanius dispar

1992 ◽  
Vol 50 (1) ◽  
pp. 548-549
Author(s):  
Taber A. Ba-Omar ◽  
Philip F. Prentis
Keyword(s):  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Freshwater Teleost ◽  
Isolated Populations ◽  
En Bloc ◽  
The North ◽  
Group A ◽  
Ultrathin Sections ◽  
Group B ◽  
Geographically Isolated

We have recently carried out a study of spermiogenic differentiation in two geographically isolated populations of Aphanius dispar (freshwater teleost), with a view to ascertaining variation at the ultrastructural level. The sampling areas were the Jebel Al Akhdar in the north (Group A) and the Dhofar region (Group B) in the south. Specimens from each group were collected, the testes removed, fixed in Karnovsky solution, post fixed in OsO, en bloc stained with uranyl acetate and then routinely processed to Agar 100 resin, semi and ultrathin sections were prepared for study.

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