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The validity and reliability of the Turkish version of the Patient's Knee Implant Performance (PKIP)
Nilay Şahan1, Songül Atasavun Uysal2, Ayhan Parmaksiz3
1Department of Occupational Therapy, Faculty of Health Sciences, Çankiri Karatekin University, Çankiri, Turkey.
Abstract:
The Patient's Knee Implant Performance (PKIP) Questionnaire is a short and easy-to-complete questionnaire developed to assess the performance of total knee arthroplasty (TKA) more comprehensively. The aim of this study was to investigate the validity and reliability of the Turkish version of the PIKP questionnaire before (PKIP PreOp) and after (PKIP PostOp) TKA. The study included 162 patients referred for TKA and 154 patients who had undergone the surgery at least 3 months prior. Cronbach alpha, intra-class correlation coefficient, and item-total correlation values were calculated to assess the reliability of the PIKP questionnaire. Validity was determined using exploratory and confirmatory factor analysis. To determine parallel scale validity, the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), The Short Form-36 (SF-36) Quality of Life Scale performance score were used. The mean age of the participants was 66.39 ± 7.65 years. Cronbach alpha and intra-class correlation coefficient values of the PKIP were acceptable (0.723 and 0.985, respectively). The item-total correlation values of each item of the PKIP was also acceptable (lowest ranged from 0.335 to 0.621). Confirmatory and exploratory factor analysis revealed that the both PKIP PreOp and PKIP PostOp studies had sufficient fit. The PKIP PreOp and PKIP PostOp was moderately to strongly correlated with the Western Ontario and McMaster Universities Osteoarthritis Index and Short Form-36 score (P < .001). Patients undergoing TKA had a significantly higher PKIP PostOp score than PKIP PreOp score. The Turkish version of the PKIP is valid, reliable, and sensitive to assess in performance in patients undergoing TKA.
