Abstract
BackgroundThe NKSS has recently been translated into Dutch version. The reliability and validity were also assessed. However, there is no Simplified Chinese version of New Society Knee Scoring System (SC-NKSS) for Chinese population.MethodsThe SC-NKSS was translated from the original English version following international guidelines. All patients undergoing total knee arthroplasty (TKA) between September 2012 and September 2013 were invited to participate in this study. Finally, a total of 105 did so. Patients (preoperative and postoperative) completed the Chinese version of NKSS, Oxford Knee Score (OKS), the Medical Outcomes General Health Survey (SF-36) and Visual analog scale (VAS). Psychometric testing of reliability, construct validity, content validity were conducted.ResultsAll the 105 participants completed the questionnaires and no floor or ceiling effects were checked. Internal consistency was excellent with Cronbach’s alpha coefficient ranging from 0.71 to 0.85. Test-retest reliability was satisfactory with an intraclass correlation coefficient of 0.92 (95%confidence interval, 0.86–0.95). Construct validity was demonstrated to correlate well with the Chinese version of OKS (r =−0.78; p < 0.01), VAS (r =−0.70; p < 0.01), Physical Function (PF) (r = 0.74; p < 0.01), Body Pain (BP) (r = 0.63; p < 0.01) and General Health (GH) (r = 0.51; p < 0.01) of SF-36 domains.ConclusionThe SC-NKSS was well accepted and demonstrated acceptable psychometric properties in mainland China.Electronic supplementary materialThe online version of this article (doi:10.1186/s12891-015-0854-1) contains supplementary material, which is available to authorized users.
Highlights
The New Society Knee Scoring System (NKSS) has recently been translated into Dutch version
Score distribution and acceptability There were no floor or ceiling effects in the target population, which indicated a good distribution for the SCNKSS
All participants completed the questionnaire without any difficulties and no issues with missing or multiple responses
Summary
There is no Simplified Chinese version of New Society Knee Scoring System (SC-NKSS) for Chinese population. Since the publication of the first studies of total knee arthroplasty (TKA) in the 1960s, TKA has developed into a reliable surgical procedure to reduce pain, restore mobility and improve the quality of life for patients with osteoarthritis of the knee [3, 4]. In 1989, The Knee Society Clinical Rating System was developed, and it became the most prevalent method to track and assess outcomes after TKA throughout the world [6, 7]. The reliability, validity and responsiveness of the Knee Society Clinical Rating System have been challenged [2, 6]
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