Table 3.
The correlation between muscle thickness change and other possible contributary factors.
| Baseline data | Correlation coefficient | P value |
|---|---|---|
| OA severity level | ||
| PTC at 90 | −0.2 | 0.15 |
| PTC at 60 | −0.09 | 0.51 |
| PTC at submax | −0.02 | 0.88 |
| Pain duration | ||
| PTC at 90 | 0.03 | 0.85 |
| PTC at 60 | −0.11 | 0.42 |
| PTC at submax | −0.15 | 0.26 |
| Pain scale | ||
| PTC at 90 | 0.06 | 0.69 |
| PTC at 60 | 0.05 | 0.73 |
| PTC at submax | 0.05 | 0.74 |
PTC: percentage of thickness change; 90: MVC at knee flexion 90°; 60: MVC at knee flexion 60°; submax: submaximal effort (30% of MVC) at knee flexion 60°.