Purpose
To determine the minimal clinically important difference (MCID) for the Constant–Murley
Score (CMS), University of California Los Angeles (UCLA) Shoulder Score, and Oxford
Shoulder Score (OSS) after reverse shoulder arthroplasty.
Methods
Patients were prospectively followed up between January 2011 and February 2020. Inclusion
criteria was that of patients who underwent reverse shoulder arthroplasty for massive
irreparable cuff tear, cuff tear arthropathy, and fractures, with and without previous
cuff repair, by a fellowship-trained surgeon. Patients were assessed preoperatively
and at 3, 6, and 12 months’ postoperatively. Functional outcome was assessed by the
CMS, UCLA Shoulder Score, and OSS and the respective MCIDs were determined using simple
linear regression in consonance with patient satisfaction and expectation fulfilment.
Results
A total of 131 patients were followed up for 12 months. The MCIDs at 3 months for
CMS, UCLA Shoulder Score, and OSS were 7.2, 3.3, and 6.9, respectively. At 6 months,
the MCIDs for CMS, UCLA Shoulder Score, and OSS were 6.6, 2.4, and 4.7, respectively.
At 12 months, the MCIDs for CMS, UCLA Shoulder Score, and OSS were 9.3, 2.9, and 6.6,
respectively.
Conclusions
CMS, UCLA Shoulder Score, and OSS are valid scores to calculate MCID after reverse
shoulder arthroplasty, and the MCID established in this study can be used for the
interpretation of these scores to help in statistical power analysis for future studies.
Level of Evidence
III, retrospective cohort study.
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Article info
Publication history
Published online: December 30, 2022
Accepted:
December 15,
2022
Received:
March 19,
2022
Footnotes
The authors report that they have no conflicts of interest in the authorship and publication of this article. Full ICMJE author disclosure forms are available for this article online, as supplementary material.
Identification
Copyright
© 2022 by the Arthroscopy Association of North America
