Article

Recently, a shorter version of Western Ontario Rotator Cuff Index
(Short-WORC) was proposed as a subset of 7 items from the original 21-item WORC.
However, the reproducibility of the Short-WORC has not been established. PURPOSE
OF THE STUDY: To determine reproducibility (reliability and agreement) of the
Short-WORC among patients with rotator cuff disorders (RCDs). METHODS: Patients
(n = 153) diagnosed with RCD completed the WORC at baseline and at 3 months
post-operatively (n = 146).
The Short-WORC was extracted from the full version of
WORC. From this retrospective cohort, 43 patients were retested within 5 weeks,
if they remained stable. Cronbach's alpha (alpha) and intra class correlation
coefficients (ICC2,1) were used to assess internal consistency and test-retest
reliability respectively. Standard error measurement (SEM), minimal detectable
change (MDC90) and Bland Altman (BA) plots were used to assess agreement.
RESULTS: No floor and ceiling effects were reported for either the Short-WORC or
WORC. Cronbach's alpha were 0.84 and 0.90 at baseline and 0.89 and 0.95 at 3
month of follow up for Short-WORC and WORC respectively. The ICC2,1 were 0.89 and
0.91 for the Short-WORC and WORC respectively. The agreement parameters for the
Short-WORC were: SEMagreement = 8.8, MDC90individual = 20.3, MDC90group = 5.1. We
found substantial agreement between the two versions of WORC on BA plots with
minimal (mean difference (d) <1) systematic differences between them. The limits
of agreement (LOA) between two versions of WORC were similar across sessions and
fell within range of -11.7 to 13.2 points at test and -14.7 to 14.7 points at
retest. CONCLUSION: Short-WORC and WORC demonstrates strong reproducibility and
can be used for group and individual comparison of health-related quality of life
(HRQoL) among patients with RCD. Wider LOA may be expected when using the
Short-WORC for individual patient assessment. Reproducibility data is essential,
but should be supplemented by validation of actual Short-WORC with samples representing the spectrum of RCD. LEVEL OF EVIDENCE: N/A.
CI - Copyright (c) 2016 Hanley & Belfus. Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS