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The International Knee Documentation Committee Subjective Knee Form (IKDC-SKF) is a region-specific patient-oriented outcome measure in patients with knee disorders. We aimed to translate the IKDC-SKF questionnaire into Danish and test its reliability and responsiveness in patients with a variety of knee disorders. The translation process followed international guidelines. Reliability and responsiveness were assessed in a clinical study on patients with a median age of 25 (range 18-80) years. Reliability was assessed in 56 patients completing the IKDC-SKF twice within 2 weeks and responsiveness in 64 adults completing the IKDC-SKF twice within 6 months. Evaluating reliability, the intraclass correlation coefficient (ICC) was 0.94 (0.91; 0.97), standard error of measurement (SEM) was 2.6 (2.2; 3.3) points, and smallest detectable change was 7.2 points. Evaluating responsiveness, the change in scores was correlated to the Global Rating Scale (GRS) (Spearman's rho = 0.32) (P = .01). The GRS consists of answers from "a very great deal worse "to "a very great deal better." The standardized response mean showed a large effect in patients reporting improvement. The minimal important change was 7.0 points. In patients with a variety of knee disorders, the Danish IKDC-SKF demonstrated excellent testretest reliability at group and individual level and adequate responsiveness.

The Tegner Activity Scale (TAS) has been used in several Danish studies. However, the TAS has not been cross‐culturally adapted into Danish. We aimed to translate the TAS into Danish and to evaluate its measurement properties in patients with knee disorders. The TAS was translated into Danish following international guidelines. The measurement properties were evaluated in 86 patients (median: 25 years). For reliability, 56 patients completed the scale twice within 9 days. Responsiveness and interpretability were evaluated in 64 patients completing the TAS 6 months later. For reliability, the intraclass correlation coefficient was 0.7 (CI: 0.6‐0.8), the standard error of measurement was 0.7 points (CI: 0.6‐0.9), the smallest detectable change was 2.1 points (CI: 1.7‐2.5), and the limits of agreement were −1.7‐2.4 points. For responsiveness, the correlation between the TAS change score and the Global Rating of Change Scale was 0.3 (CI: 0.1‐0.5). In patients reporting improved knee condition, 55% reported a TAS change score of minimum 1 point. For interpretability, the minimal clinically important change was 0.7 points (SD: 1.4), and no floor or ceiling effects were found. In conclusion, the Danish version of the TAS has acceptable test‐retest reliability. However, the TAS seems less adequate to evaluate changes over time.

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