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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Acknowledgements
The authors are grateful to Hugo Bothorel and Mo Saffarini for their assistance with statistical analysis and manuscript redaction.
Funding
This study was funded by a non-profit foundation for Research and Teaching in Orthopaedics, Sports Medicine, Trauma and Imaging (FORE), with no commercial interest in the present study. The sources of funds were involved in data analysis and manuscript redaction.
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As the study was performed using pre-existing CT scans of a cadaveric shoulder, institutional review board (IRB) approval was not required.
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PB reports personal fees from Wright during the conduct of the study. PC reports personal fees from Wright, Stortz, Smith and Nephew and ConMed, during the conduct of the study; personal fees from Advanced Medical Applications, outside the submitted work. PJD reports personal fees from Arthrex, Medacta and Wright, during the conduct of the study and personal fees from Lippincott Williams & Wilkins, outside the submitted work. AL reports personal fees from Wright, Medacta, Arthrex and Wright during the conduct of the study. GW reports personal fees from Wright during the conduct of the study. OZ, JCHC and FO states that they have no conflict of interest.
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Lädermann, A., Denard, P.J., Collin, P. et al. Effect of humeral stem and glenosphere designs on range of motion and muscle length in reverse shoulder arthroplasty. International Orthopaedics (SICOT) 44, 519–530 (2020). https://doi.org/10.1007/s00264-019-04463-2
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DOI: https://doi.org/10.1007/s00264-019-04463-2