Walking Stair ascending 17 cm
  Patients (n=18) Controls (n=20) Difference 95% CI P-value t-test Patients (n=18) Controls (n=20) Difference 95% CI P-value t-test
Spatio-temporal parameters  
Gait velocity [m/s] 1.05 (0.08) 1.06 (0.06) [-0.03; 0.02] 0.752 0.44 (0.07) 0.46 (0.07) [-0.07;-0.02] <0.001
Cadence [steps/min] 104.2 (8.8) 103.2 (6.5) [-1.9; 3.9] 0.489 76.1 (10.9) 71.9 (7.2) [-7.2;-0.2] 0.037
Step length [m] 0.61 (0.05) 0.62 (0.04) [-0.03; 0.01] 0.215 0.39 (0.05) 0.44 (0.06) [-0.1; -0.01] 0.004
Lower body kinematics  
Foot progression angle initial contact (+ = internal rotation) [°] -6.2 (5.6) -8.9 (4.7) [0.9; 4.7] 0.040 -4.9 (6.3) -6.8 (5.2) [-0.1; 4.1] 0.061
Maximum ankle dorsiflexion terminal stance [°] 18.9 (3.1) 15.2 (2.9) [2.6; 4.8] <0.001 16.6 (3.9) 15.8 (3.7) [1.1; 3.9] <0.001
Minimumknee flexion angle terminal stance & pre swing[°] 9.1 (4.9) 3.1 (3.9) [4.4; 7.6] <0.001 11.4 (3.6) 7.5 (4.4) [2.5; 5.5] <0.001
Minimum sagittal hip angle terminal stance & pre swing [°] -8.4 (5.9) -12.3 (6.5) [1.6; 6.1] <0.001 11.3 (6.7) 9.6 (7.2) [-2.0; -7.1] <0.001
Meanhip rotation angle mean stance phase [°] -10.6 (6.7) -4.2 (7.1) [-8.9; -3.8] <0.001 -7.6 (7.4) -3.6 (7.1) [-7.8;-2.5] <0.001
Upper body kinematics  
Anterior trunk tilt [°] 2.2 (3.3) 1.3 (3.8) [-0.5; 2.2] 0.200 14.9 (5.0) 13.7 (6.6) [1.4; 5.6] <0.001
Maximum anterior trunk tilt [°] 2.8 (3.3) 2.1 (3.7) [-0.7; 1.9] 0.390 17.1 (5.5) 16.5 (6.4) [1.7; 6.0] <0.001
ROM trunk tilt stance phase [°] 2.1 (0.8) 2.4 (1.2) [-0.7; 0.0] 0.070 3.9 (2.3) 4.6 (1.7) [-3.4; 1.1] 0.291
Initial trunk lean [°] -0.2 (2.2) -0.4 (1.9) [-0.5; 1.0] 0.496 0.6 (2.9) 0.4 (2.6) [-0.7; 1.3] 0.536
Maximum contralateral trunk lean [°] 2.0 (2.1) 1.7 (1.7) [-0.4; 1.0] 0.458 3.2 (2.8) 3.8 (3.0) [-0.9; 1.2] 0.756
Maximum ipsilateral trunk lean [°] 1.6 (2.2) 2.0 (2.2) [0.4; -1.2] 0.369 2.5 (3.1) 3.5 (2.2) [0.9; -1.1] 0.890
Initial external trunk rotation [°] 1.9 (2.8) 1.8 (2.1) [1.0; -0.8] 0.905 6.1 (3.6) 6.6 (3.8) [1.5; -1.2] 0.818
Maximum internal trunk rotation [°] 3.3 (3.0) 1.9 (2.2) [0.5; 2.4] 0.005 7.1 (3.6) 7.0 (3.1) [0.5; 2.9] 0.006
ROM trunk rotation stance phase [°] 6.0 (2.5) 4.7 (2.5) [0.3; 2.2] 0.008 14.0 (4.1) 14.7 (4.1) [0.1; 3.1] 0.038
Table 3: Group effects for walking and stair ascending. Mean (SD), 95%-confidence intervals of the difference and p-values of t-test for spatiotemporal and lower and upper kinematic parameters during the stance phase of walking and stair ascending in patients with good functional outcome after TKA and in age-matched control subjects. CI—confidence interval; ROM: Range of Motion. 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.