Patients (n=18) Controls(n=20) Difference95% CI P-valuet-test Knee flexion [°] 121.4(9.5) 134.3(10.3) [6.3;19.0] <0.001 Knee extension [°] 0.6(1.6) 0.3(1.1) [-1.2; 0.6] 0.499 Hip extension [°] 10.3(4.4) 7.5(6.0) [-0.7; 6.2] 0.113 External hip rotation [°] 28.6(8.2) 27.0(11.7) [-8.3; 5.1] 0.630 Internal hip rotation [°] 35.0(10.7) 27.8(9.5) [-13.9;-0.6] 0.034 Tibia torsion [°] -23.1(6.7) -22.9(7.2) [-4.4; 4.8] 0.928 Muscle strength knee extensors 4.9(0.3) 5.0(0.2) [-0.9; 0.2] 0.494 Numbers of heel rises 18.0(10.1) 29.7(20.0) [1.0;22.3] 0.059

Table 2: Mean (standard deviation) clinical parameters for patients after TKA and age-matched control subjects. 95% confidence interval of the difference (CI) and p-value of t-test (metrical parameters) Mann-Whitney-U-Test (ordinal parameters). CI: Confidence Interval. Note: Independent samples t-tests were used to confirm clinically relevant differences indicated by the confidence interval of the difference between groups not containing 0.