Abstract
BackgroundOsteoarthritis (OA) of the hip is a disease that entails a major burden for patients and the society as a whole. One way of measuring this burden for the patient is through impact on Health-related Quality of Life (HRQL). The Oxford Hip Score (OHS) is a well-known tool to measure HRQL in patients with OA of the hip. This study aims to assess the psychometric properties of the Spanish-adapted version of the OHS, including its reliability, validity, and sensitivity to change.MethodsProspective observational study that included 361 patients diagnosed with hip OA (according to the criterion of the American College of Rheumatology) from 3 different Spanish regions. Their HRQL was assessed using a generic questionnaire, the EQ-5D-5 L, and two specific ones (the Western Ontario and McMaster Universities Osteoarthritis Index, WOMAC, and the OHS) adapted to Spanish. There was a follow-up period of 6 months, and the acceptability, psychometric properties, presence of ceiling and floor effects, validity, reliability, and sensitivity to changes of the OHS were measured.ResultsThe OHS was fully answered in 99.4% of cases with no indication of ceiling or floor effects. Its factor structure can be explained in a single dimension. Its discriminative capacity was very good compared to the groups generated by the WOMAC and the EQ-5D-5 L. The correlation between the OHS and dimensions of the WOMAC or EQ-5D-5 L utilities was ≥0.7. Excellent test-retest reliability (ICC = 0.992; CI95%: 0.994–0.998) and internal consistency (Cronbach’s α = 0.928) were observed. The minimal clinically important difference (MCID) was 7.0 points, and the minimum detectable change (MDC) was 5.5 points. The effect size for moderate improvement in perceived HRQL was 0.73, similar to that of WOMAC dimensions and higher than the EQ-5D-5 L.ConclusionsThe Spanish-adapted version of the OHS is a useful, acceptable tool for the assessment of perceived HRQL in patients with hip OA, and has psychometric properties similar to those of the WOMAC that allow for discriminating both a patient’s condition at a given moment and changes that can occur over time.
Highlights
Osteoarthritis (OA) of the hip is a disease that entails a major burden for patients and the society as a whole
This study aims to assess the psychometric properties of the Spanish-adapted version of the Oxford Hip Score (OHS), including its factorial structure and other aspects of reliability, validity, and capacity to detect changes
Patients diagnosed with hip OA according to the criterion of the American College of Rheumatology [30] were recruited from traumatology, rheumatology, and primary care consultations in Vizcaya, Madrid, and Tenerife
Summary
Osteoarthritis (OA) of the hip is a disease that entails a major burden for patients and the society as a whole. One way of measuring this burden for the patient is through impact on Health-related Quality of Life (HRQL). Hip OA greatly impacts the patient’s perception of health-related quality of life (HRQL) [6], and entails a great burden for the individual and the society as a whole. Studies of international scope have estimated that OA of the knee and hip constitute 0.7% of all disability adjusted life years (DALY) [7]. A study performed in Spain in 2007 estimated a yearly expenditure of €1500 per patient with hip or knee OA, 86% of which were direct costs [10]
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