Abstract
Introduction
The purpose of this multi-centre study was to assess external rotation in a large cohort following reverse shoulder arthroplasty (RSA) at a minimum follow-up of 2 years, and identify factors that influence postoperative and/or net-improvement of external rotation.
Methods
The authors retrospectively reviewed records of 743 RSAs performed between January 2015 and August 2017 by 16 surgeons that participated in a large national society symposium; 193 (25.7%) were lost to follow-up, 16 (2.1%) died, and 33 (4.4%) were revised with implant exchange, which left 501 available for assessment at 2.0–5.5 years. Pre- and post-operative active forward elevation, active external rotation (ER1), active internal rotation (IR1) and constant score (CS) were collected. Regression analyses were performed to determine associations of patient demographics, surgical and implant parameters, rotator cuff muscles status and radiographic angles with ER1.
Results
Multivariable analyses revealed postoperative ER1 decreased with age (β, − 0.35), increased with lateralisation shoulder angle (LSA) (β, 0.26), and was better in shoulders operated by the antero-superior (AS) approach (β, 11.41), but worse in shoulders with absent/atrophic teres minor muscles (β, − 10.06). Net-improvement of ER1 increased with LSA (β, 0.39), was better with inlay stems (β, 8.33) and BIO RSA (β, 6.22), but worse in shoulders operated for primary OA with rotator cuff (RC) tears (β, − 16.26), for secondary OA due to RC tears (β, − 16.06), or for mRCT (β, − 18.96).
Conclusions
This large multi-centre study revealed that, at a minimum of 2 years following RSA, ER1 improved by 16.1°. Postoperative ER1 was better in shoulders which had normal or hypertrophic teres minor muscles, were operated by the AS approach, or with greater LSA. Net-improvement of ER1 was better in shoulders with inlay stems, with BIO RSA, or with greater LSA, but worse in shoulders with rotator cuff deficiency.
Level of evidence
IV.
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Availability of data and material
The authors would consider making raw data available on request.
Code availability (software application or custom code)
Not applicable.
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Acknowledgements
Contributors of ReSurg: Jacobus H Müller6, Aude Hibon6, Luca Nover6, Mo Saffarini6.
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The authors are grateful to ELSAN for funding the statistical analysis and manuscript preparation for this study.
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LD: Data collection, interpretation of findings and manuscript writing. AG: Study design, data collection, interpretation of findings and manuscript editing. CN: Study design, data collection, interpretation of findings and manuscript editing. RA: Study design, data collection, interpretation of findings and manuscript editing. JHM: Manuscript writing. AH: Project management, data collection, and coordination. LN: Statistical analysis, tables and figures. MS: Interpretation of findings, manuscript writing. JG: Procurement of funding, study design, data collection, interpretation of findings manuscript editing.
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LD, RA states that they have no conflicts of interest. AG and JG reports fees from Tornier SAS outside of the submitted work. CN reports support from DePuy Synthes outside the submitted work.
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Ducharne, L., Godenèche, A., Nérot, C. et al. Factors that affect external rotation following reverse shoulder arthroplasty: a retrospective multi-centre study on 501 shoulders. Arch Orthop Trauma Surg 143, 6487–6496 (2023). https://doi.org/10.1007/s00402-023-04935-6
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DOI: https://doi.org/10.1007/s00402-023-04935-6