Translation and Validation of the German New Knee Society Scoring System

Abstract

Background In 2011 the Knee Society Score (KSS) was revised to include patient expectations, satisfaction, and physical activities as patient-reported outcomes. Since the new KSS has become a widely used method to evaluate patient status after TKA, we sought to translate and validate it for German-speaking populations.Questions/purposes After translation of the new KSS into German using established guidelines, we sought to test the new German version for (1) validity; (2) responsiveness; and (3) reliability. Methods The new KSS form was translated and adapted according to the available guidelines. The final version was used to validate the German version of the new KSS One of the authors certifies that he (TK) has received benefits, during the study period, in an amount of less than USD 10,000 from Medizinischen Hochschule (Brandenburg, Germany). One of the authors certifies that he (WF) has received royalties and stock options, during the study period, in an amount of USD 100,001 to USD 1,000,000 from Conformis (Billerica, MA, USA), outside the submitted work. One of the authors certifies that he (GRS) has received royalties and consulting fees, during the study period, in an amount of USD 100,001 to USD 1,000,000, from Zimmer Biomet (Warsaw, IN, USA); research support and consulting fees, during the study period, in an amount of USD 10,000 to USD 100,000 from Pacira (Parsippany, NJ, USA); consulting fees in an amount of less than USD 10,000 from Medtronic (Minneapolis, MN, USA); and an honorarium during the study period in an amount of less than USD 10,000 from Acelity (San Antonio, TX, USA), outside the submitted work. Clinical Orthopaedics and Related Research® neither advocates nor endorses the use of any treatment, drug, or device. Readers are encouraged to always seek additional information, including FDA approval status, of any drug or device before clinical use. Each author certifies that his institution approved the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.

Factors contributing to 1-year dissatisfaction after total knee arthroplasty: a nomogram prediction model

“…The Knee Society Score (KSS, 2011) is a comprehensive and validated measurement determined based on a clinician-reported objective subscale (not further evaluated in this study) and patient-reported subscales (including symptoms, satisfaction, and functional activity subscale). The higher the score, the better the outcomes of all subscales [29] The KSS takes into consideration patient reports of both expectations and satisfaction [30] . One year after TKA, we measured patient satisfaction by asking an overall satisfaction assessment question based on the 2011 KSS patient satisfaction subscale.…”

The influence of obesity on functional outcomes and patient satisfaction 8 weeks after total knee arthroplasty: results of the prospective FInGK study

“…Patient expectations and expectation fulfilment were assessed using the pre- and post-operative German New Knee Society Score (GNKSS, 2011 version) [ 35 ]. Pre-operative GNKSS expectation questions about pain relief, activities of daily living (ADL), and leisure activities were asked at t0.…”

No correlation between symmetry-based performance measures and patient-related outcome prior to and after total knee arthroplasty

“…The Knee Society Score (KSS) and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) were used for patient outcome measures (PROMs), both validated in German [16, 32].…”