Cross-cultural adaptation and validation of the Romanian Hip disability and Osteoarthritis Outcome Score for Joint Replacement.

Objective: Perform translation, cultural adaptation and psychometric testing of the Romanian translation of the Hip disability and Osteoarthritis Outcome Score for Joint Replacement (HOOS_JR).

Design: Assess construct validity, reliability, internal consistency and reproducibility.

Setting: Adults with chronic hip disability prior or at a minimum of 3 months after surgery.

Participants: Ninety-six patients (22 bilateral) with hip osteoarthritis or who had previous hip replacement or osteosynthesis for a fracture of the trochanteric region.

Intervention: Complete the HOOS_JR together with the Oxford Hip Score (OHS_RO), Harris Hip Score (HHS) and Euroqol EQ-5D. 57 patients repeated the HOOS_JR after 2 days.

Main Outcome Measure: Convergent validity using Spearmans's correlation coefficient; Cronbach's alpha coefficient, intraclass correlation coefficient (ICC, two-way mixed effects model) and inter-item correlation matrix and test-retest assessment after 2 days.

Results: The questionnaire had a high degree of reliability with a Cronbach's α of 0.923 at the initial completion and 0.924 at the second testing. The ICC was 0.923 for average measures for the first form and 0.910 for the second form. The two results were strongly, positively and significantly correlated (rs = 0.859; P < 0.001). The Romanian HOOS_JR strongly, significantly and positively correlated with the OHS_RO (rs = -0.880 initial and rs = -0.803 s; P < 0.001) and HHS (rs = -0.731 initial and rs = -0.654 s; P < 0.001) and moderately, significantly and positively correlated with the EQ-5D Index (rs = -0.580 initial and rs = -0.542 s; P < 0.001) and VAS (rs = -0.500 initial and rs = -0.690 s; P < 0.001).

Conclusions: The translated HOOS_JR is a reliable, reproducible and valid measure of function in patients with chronic hip disability.