Research Article
Biomechanical Alterations during Sit-to-Stand Transfer Are Caused by a Synergy between Knee Osteoarthritis and Obesity
Table 2
STS-parameters for all different groups. Data are presented as mean (±SD).
| | STS-parameter | Group | | Control (n=22) | Lean knee OA (n=14) | Obese knee OA (n=19) |
| | STS time (s) | | | | | Total | 0.99 (0.21) | 1.11 (0.28) | 1.17 (0.43) | | Sub-phase duration (%) | | | | | Leaning phase | 17.8 (6.1) | 19.2 (6.2) | 21.2 (9.6) | | Momentum phase | 16.0 (6.0) | 12.1 (4.7) | 14.7 (5.1) | | Extension phase | 66.2 (7.0) | 68.7 (5.1) | 64.1 (7.8) | | Joint ROM (°) | | | | | Ankle (sagittal) | 18.8 (6.6) | 18.9 (6.1) | 14.2 (6.5) | | Knee (sagittal) | 85.5 (11.4) | 85.8 (8.2) | 75.9 (10.3)1,2 | | Hip (sagittal) | 79.7 (7.4) | 81.7 (5.4) | 73.1 (12.3)1,2 | | Maximum joint moment (Nm/kg) | | | | | Ankle (sagittal) | 0.32 (0.12) | 0.32 (0.09) | 0.29 (0.08) | | Knee (sagittal) | 0.89 (0.20) | 0.83 (0.16) | 0.70 (0.18)1 | | Knee (frontal) | 0.30 (0.22) | 0.26 (0.21) | 0.27 (0.18) | | Hip (sagittal) | 0.87 (0.19) | 0.79 (0.15) | 0.67 (0.16)1 | | Ground reaction force (BW) | | | | | GRFz max | 0.62 (0.06) | 0.58 (0.05) | 0.54 (0.08)1 | | Ground reaction force (N) | | | | | GRFz max | 374.6 (48.8) | 376.2 (52.9) | 459.0 (89.4)1,2 | | GRFx max | 33.9 (8.22) | 37.1 (10.2) | 45.9 (16.5)1,2 | | GRFy max | 37.4 (12.2) | 34.9 (12.4) | 47.7 (12.6)1,2 |
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Note. STS = sit-to-stand, ROM = range of motion, BW = bodyweight, GRFz = vertical ground reaction force, GRFx = medio-lateral ground reaction force, GRFy= anterior-posterior ground reaction force, and OA = osteoarthritis.
1 = significantly different from control.
2 = significantly different from lean knee OA.
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