Validation of the Western Ontario Rotator Cuff Index in Patients With Arthroscopic Rotator Cuff Repair (WORC)
Arthroscopic rotator cuff repair is described as being a successful procedure. These results are often derived from clinical general shoulder examinations, which are then classified as 'excellent', 'good', 'fair' or 'poor'. However, the cut-off points for these classifications vary and sometimes modified scores are used.
Arthroscopic rotator cuff repair is performed to improve quality of life. Therefore, disease specific health-related quality of life patient-administered questionnaires are needed. The WORC is a quality of life questionnaire designed for patients with disorders of the rotator cuff. The score is validated for rotator cuff disease, but not for rotator cuff repair specifically.
The aim of this study is to investigate reliability, validity and responsiveness of WORC in patients undergoing arthroscopic rotator cuff repair.
Rotator Cuff Lesion
Disorder of Rotator Cuff
Other Instability, Shoulder
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Validation of the Western Ontario Rotator Cuff Index in Patients With Arthroscopic Rotator Cuff Repair|
- Reliability of the WORC [ Time Frame: 6 months ] [ Designated as safety issue: No ]Reliability of the WORC is tested by comparing the results at T0 with T1. T1 is planned 2-3 weeks after T0, because we expect that the symptoms do not change between these two moments and the time span is large enough to forget initial responses to the questions. In order to signal change in severity of the symptoms, at both moments patients are asked to rate their shoulder hindrance. To determine test-retest reliability, intraclass correlation coefficients (ICC) are used.
- Criterion validity of the WORC [ Time Frame: 6 months ] [ Designated as safety issue: No ]Criterion validity is measured by comparing WORC with a general quality of life questionnaire (SF-36) and a commonly used clinical shoulder score (Constant Score) both at T0 and T1. Bland Altman plots will be used to estimate 95% boundaries of concurrence.
- Responsiveness of the WORC [ Time Frame: 6 months ] [ Designated as safety issue: No ]Responsiveness will be determined by calculating the standardized response means and effect sizes on T0 and T2 scores on WORC, SF-36 and Constant scores for the subgroups.
- Differentiation between patient groups [ Time Frame: 6 months ] [ Designated as safety issue: No ]A comparison of WORC scores between the three distinct groups is made, to see whether WORC scores can differentiate between them. WORC scores will be compared with SF-36 to investigate whether the noted differences correlate with notable clinical differences and can be expressed as MCID's (minimal clinical important differences).
|Study Start Date:||November 2011|
|Estimated Study Completion Date:||March 2014|
|Estimated Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
Rotator cuff repair group
Patients undergoing an arthroscopic rotator cuff repair
DRC without rupture
Disorders of the rotator cuff without rupture
An approved translation of the WORC into Dutch is used. In this prospective study three groups of patients are used: 1.Arthroscopic rotator cuff repair; 2.Disorders of the rotator cuff without rupture; 3.Shoulder instability.
The WORC, SF-36 and the Constant Score are obtained twice before therapy is started to measure reliability and validity. Responsiveness is tested by obtaining the same tests after therapy.
|Department of Orthopedics, St. Antonius Hospital|
|Nieuwegein, Netherlands, 3430 EM|
|Principal Investigator:||Ronald N Wessel, MD||St. Antonius Hospital|
|Principal Investigator:||Henk van Mameren, PhD, MD||Department of Epidemiology, Caphri research school, Maastricht University|
|Principal Investigator:||Rob A de Bie, PhD, MA, RPt||Department of Epidemiology, Caphri research school, Maastricht University|