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Psychometric performance of the Patient-Reported Outcomes Measurement Information System-Physical Function and Oxford
Justin J Turcotte1, Andrea H Johnson1, Matthew A Peterman1
1Luminis Health Anne Arundel Medical Center, Annapolis, MD, USA.
Background:
The Patient-Reported Outcomes Measurement Information System-Physical Function (PROMIS-PF) and Oxford Shoulder Score (OSS) are frequently used patient-reported outcome measures in total shoulder arthroplasty (TSA); yet, direct psychometric comparison of these 2 measures has not been previously performed. The purpose of this study was to compare the psychometric properties of PROMIS-PF and OSS, measured at baseline and 6 months post-operatively, among patients undergoing primary TSA.
Methods:
A retrospective study of 70 patients undergoing anatomic or reverse TSA at a single institution (2021-2024) was performed. All patients included completed a pre-operative and a 6-month post-operative PROMIS-PF v2.0 short form 10a survey and OSS survey. Psychometric analysis was performed to compare internal consistency reliability, convergent construct validity, floor/ceiling effects, and responsiveness between measures.
Results:
Both PROMIS-PF and OSS demonstrated excellent internal consistency reliability and strong responsiveness. While both instruments had very low (<2%) floor/ceiling effects pre-operatively, some low-level ceiling effects were observed at 6-month follow up. A moderate correlation between measures was observed, demonstrating adequate construct validity given the intent of PROMIS-PF and OSS to measure general physical function and shoulder specific function, respectively.
Conclusion:
In patients undergoing TSA, PROMIS-PF and OSS demonstrated strong psychometric performance. As the 2 measures evaluate the unique but related constructs of general and shoulder-specific function, they displayed moderate correlation. Therefore, both PROMIS-PF and OSS hold value in assessing the outcomes of TSA patients and may be effectively used concurrently in practice.
