Table 2 Passive range of knee motion, knee gait biomechanics, and time and distance parameters at baseline and one year after total knee arthroplasty. Patients are grouped according postoperative change in knee-related quality of life
Control group n = 25 | Good outcome group, n = 19 | Poor outcome group, n = 9 | Effect of interactions | Within group differences | Between group differences | Postop ∆ adj. for baseline | |||
|---|---|---|---|---|---|---|---|---|---|
Reference | Baseline | Postoperative | Baseline | Postoperative | p | p | p | ||
Passive range of knee motion, degrees | |||||||||
Flexion, mean (SD) | 136 * ‖ (5) | 119 (15) | 115 (10) | 124 (16) | 112 (14) | 0.182 | a) 0.306 b) 0.025 | c) 0.375 d) 0.516 | - |
Extension, mean (SD) | 2 (4) | −5 (7) | 0 (3.5) | 0 (7) | 0 (6) | 0.152 | a) 0.007 b) 0.814 | c) 0.187 d) 0.880 | - |
Knee kinematics during gait, degrees | |||||||||
Peak flexion, mean (SD) | 54 * ‖ (4) | 48 (10) | 53 (6) | 53 (6) | 52 (4) | 0.081 | a) 0.004 b) 0.973 | c) 0.175 d) 0.782 | - |
Flex-Ext range, mean (SD) | 57 ‖ (5) | 45 (6) | 53 (5) | 52 (5) | 50 (6) | 0.003 | a) 0.000 b) 0.471 | c) 0.009 d) 0.275 | e) 0.143 |
Peak varus angle during stance, mean (SD) | 3.2 * (3.3) | 10.5 (6.1) | 5.7 (4.8) | 8.5 (4.3) | 5.6 (2.4) | 0.246 | a) 0.000 b) 0.042 | c) 0.375 d) 0.953 | - |
Knee kinetics during gait, Nm/kg | |||||||||
Peak flexion moment, mean (SD) | −0.54 ‖ (0.17) | −0.41 (0.11) | −0.49 (0.15) | −0.41 (0.10) | −0.38 (0.11) | 0.044 | a) 0.009 b) 0.540 | c) 0.966 d) 0.054 | - |
Peak extension moment, mean (SD) | 0.50 * ‖ (0.10) | 0.43 (0.19) | 0.37 (0.15) | 0.39 (0.29) | 0.33 (0.21) | 0.976 | a) 0.171 b) 0.324 | c) 0.672 d) 0.555 | - |
Peak valgus moment, mean (SD) | 0.60 * ‖ (0.10) | 0.60 (0.18) | 0.44 (0.16) | 0.54 (0.18) | 0.46 (0.06) | 0.154 | a) 0.000 b) 0.069 | c) 0.428 d) 0.797 | - |
Time and distance parameters | |||||||||
Walking speed, m/s, mean (SD) | 1.3 ‖ (0.2) | 1.1 (0.2) | 1.2 (0.2) | 1.1 (0.2) | 1.1 (0.2) | 0.288 | a) 0.022 b) 0.721 | c) 0.593 d) 0.086 | - |
Stance phase, % of gait cycle, mean (SD) | 60.3 ‖ (1.0) | 62.5 (2.6) | 61.3 (1.8) | 62 (1.8) | 61.7 (1.6) | 0.184 | a) 0.005 b) 0.642 | c) 0.603 d) 0.484 | - |