Abstract
Purpose
Previous studies show no difference in clinical outcomes between patients with healed and structurally failed rotator cuff repairs. The objective of this study was to assess ceiling effects when reporting surgical outcomes of arthroscopic rotator cuff repair using four of the currently most popular clinical shoulder outcome scoring systems.
Methods
Ninety-two patients who underwent arthroscopic rotator cuff repair were examined. The simple shoulder test (SST), American Shoulder and Elbow Surgeons (ASES) score, University of California at Los Angeles (UCLA) shoulder rating scale, and Constant–Murley shoulder score were completed 2 years postoperatively. Demographic data of the subjects were analysed using descriptive statistics. The ceiling effects in the outcome data assessed for each scale were estimated based on two previously reported definitions.
Results
The number of patients with the maximum possible score was 31 (33.7%) with the SST, 26 (28.3%) with the ASES score, 28 (30.4%) with the UCLA scale, and 18 (19.6%) with the Constant–Murley score. The standardised distance of the outcome data assessed by the SST, ASES score, UCLA scale, and Constant–Murley scores were 0.92, 0.97, 0.96, and 1.18, respectively.
Conclusion
The SST, ASES score, and UCLA scale evaluated at 2 years postoperatively have substantial ceiling effects showing that the proportion of patients with the maximum possible score is > 20%, and the standardised distance is < 1.0. Researchers should be aware of possible biases due to ceiling effects when interpreting the results of studies investigating the surgical outcomes of arthroscopic rotator cuff repair. It could increase the likelihood of a type II error.
Level of Evidence
IV.
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Abbreviations
- ARCR:
-
Arthroscopic rotator cuff repair
- ASES:
-
American Shoulder and Elbow Surgeons score
- ROM:
-
Range of motion
- SB:
-
Suture-bridge
- SR:
-
Single-row
- SST:
-
Simple shoulder test
- UCLA:
-
University of California at Los Angeles
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Acknowledgements
We thank Amy M. Kwon, PhD in the Biostatistical Consulting and Research Lab, Hanyang University for providing us with statistical comments and drop-out analysis.
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BGL and YHJ performed the screening of all titles, abstracts, and full texts. SJK and YHJ participated in data acquisition, performed data analysis. SJK and YHJ drafted the original manuscript. YHJ, KHL, and SYJ participated in the editing of the original manuscript. SJK, YHJ, and BGL participated in the conception and design of the original study. All authors read and approved the final manuscript.
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All patients provided informed consent for their participation in this study, which was approved by the institutional review board of Hanyang University Hospital (HYUH 2018-07-018).
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Jo, YH., Lee, KH., Jeong, SY. et al. Shoulder outcome scoring systems have substantial ceiling effects 2 years after arthroscopic rotator cuff repair. Knee Surg Sports Traumatol Arthrosc 29, 2070–2076 (2021). https://doi.org/10.1007/s00167-020-06036-y
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DOI: https://doi.org/10.1007/s00167-020-06036-y