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01-07-2021 | Painful Arc | Original Paper

Evaluation of rotator cuff abduction moment arms for superior capsular reconstruction and reverse total shoulder arthroplasty

Authors: Martine T. Dolan, Michael J. Patetta, Sonia Pradhan, Dmitriy Peresada, Danil Rybalko, Aimee Bobko, Jason L. Koh, Lewis Shi, Benjamin A. Goldberg, Farid Amirouche

Published in: International Orthopaedics | Issue 7/2021

Abstract

Purpose

The rotator cuff (RC) muscles contribute to dynamic stability and rotational actions of the glenohumeral joint. Moment arm can be used to demonstrate the potential work a muscle contributes to a musculoskeletal joint rotation. This study aimed to understand the moment arm contributions of the RC muscles and explore changes following a complete supraspinatus tear treated with either superior capsular reconstruction (SCR) or reverse total shoulder arthroplasty (rTSA).

Methods

Five fresh-frozen cadaveric specimens were prepared and mounted in an apparatus where each intact RC muscle was held in tension with a line of action toward its origin on the scapula. Mean moment arms for each muscle were determined experimentally based on Optotrak data collected during cadaveric shoulder arm abduction.

Results

Using ANOVA testing, our analysis demonstrated significant differences (p < 0.001) in infraspinatus and teres minor moment arms after rTSA compared to the intact shoulder model. After SCR, significant differences (p < 0.001) were seen in teres minor, with these differences being statistically similar to the changes seen in teres minor after rTSA. Subscapularis showed no significant difference in moment arm values between the models (p = 0.148).

Conclusion

Our results illustrate that mean moment arms were preserved in the RC muscles after complete supraspinatus tear. This study also shows evidence that subscapularis function may be maintained after SCR or rTSA. After SCR, infraspinatus may maintain similar abduction ability compared to the anatomical shoulder, while teres minor ability may increase. Infraspinatus may have decreased abduction ability after rTSA while teres minor may have increased ability.

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Title: Evaluation of rotator cuff abduction moment arms for superior capsular reconstruction and reverse total shoulder arthroplasty
Authors: Martine T. Dolan
Michael J. Patetta
Sonia Pradhan
Dmitriy Peresada
Danil Rybalko
Aimee Bobko
Jason L. Koh
Lewis Shi
Benjamin A. Goldberg
Farid Amirouche
Publication date: 01-07-2021
Publisher: Springer Berlin Heidelberg
Keyword: Painful Arc
Published in: International Orthopaedics / Issue 7/2021
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-021-05066-6

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Evaluation of rotator cuff abduction moment arms for superior capsular reconstruction and reverse total shoulder arthroplasty

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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