Table 3.
Group comparisons of medial and lateral tibiofemoral joint contact path motion and velocities during the loading response phase of downhill gait.
| Control (n=11) | Knee OA (n=11) | 95% Confidence Interval for Group Differences | Effect Size (Partial eta2) | Significance (P-value)* | |
|---|---|---|---|---|---|
| Medial Compartment | |||||
| Contact Point AP Excursion (mm) | 3.1 ± 1.8 | 4.0 ± 2.7 | -1.6 to 3.6 | 0.03 | 0.43 |
| Contact Point ML Excursion (mm) | 0.5 ± 0.3 | 1.4 ± 1.3 | 0.2 to 2.3 | 0.25 | 0.02 |
| Contact Point Velocity @ Heel-Strike (mm/second) | 31.1 ± 20.0 | 73.6 ± 36.4 | 2.3 to 67.5 | 0.21 | 0.04 |
| Peak AP Contact Point Velocity (mm/second) | 60.9 ± 42.0 | 68.7 ± 67.7 | -56.3 to 71.0 | 0.01 | 0.81 |
| Peak ML Contact Point Velocity (mm/second) | 13.2 ± 6.8 | 30.4 ± 27.2 | 4.1 to 46.9 | 0.25 | 0.02 |
| Lateral Compartment | |||||
| Contact Point AP Excursion (mm) | 3.2 ± 1.9 | 2.8 ± 1.8 | -2.0 to 2.1 | 0.01 | 0.99 |
| Contact Point ML Excursion (mm) | 0.7 ± 0.4 | 1.2 ± 0.8 | 0.30 to 1.6 | 0.33 | <0.01 |
| Contact Point Velocity @ Heel-Strike (mm/second) | 29.1 ± 14.4 | 43.9 ± 23.8 | 0.63 to 43.1 | 0.19 | <0.05 |
| Peak AP Contact Point Velocity (mm/second) | 52.1 ± 32.6 | 45.9 ± 38.3 | -33.0 to 44.0 | 0.01 | 0.75 |
| Peak ML Contact Point Velocity (mm/second) | 17.3 ± 8.6 | 20.9 ± 14.3 | -0.59 to 23.0 | 0.17 | 0.06 |
All values are expressed as mean ± standard deviations. AP = anterior/posterior; ML = medial/lateral; OA = Osteoarthritis.
*
All analyses were adjusted for group differences in body mass index.