Translation and Cross-Cultural Adaptation of the Osteoarthritis Knowledge Scale Into Turkish.

Background: The Osteoarthritis Knowledge Scale (OAKS) is a validated tool for assessing knowledge about hip and knee osteoarthritis (OA). However, to date, there has been no translation and adaptation of the OAKS for the Turkish population.

Objectives: To translate and cross-culturally adapt the OAKS into Turkish and to assess its psychometric properties in the Turkish population with and without hip or knee OA.

Methods: The OAKS was translated following accepted guidelines. A validation study assessed internal consistency, test-retest reliability and measurement error. An exploratory factor analysis was conducted to assess the factor structure.

Results: A total of 278 participants (n = 70 with hip OA, n = 105 with knee OA, and n = 103 without OA) were included. Internal consistency was 0.72, 0.79 and 0.79 for participants with hip OA, knee OA, and no OA, respectively. The test-retest intraclass correlation coefficient was 0.72 (95% CI; 0.45-0.85), 0.89 (95% CI; 0.82-0.93) and 0.88 (95% CI; 0.79-0.93) for participants with hip OA, knee OA and no OA, respectively. It had three principal components accounting for 57.2% of the total variance.

Conclusions: The Turkish version of the OAKS is a reliable and valid tool for measuring OA knowledge in the Turkish population, including those with and without hip and knee OA. Test-retest reliability was below acceptable levels in the population with hip OA only. Therefore, we recommend that the ICC be interpreted with caution when used in this population.