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 |
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.