Table 1.
Comparison of muscle CSA by MRI and US. Mean (SD), ICC, and SEM with confidence intervals for muscle CSA
| US CSA (SD), cm2 | US ICC (95% CI) | US SEM (95% CI for muscle size), cm2 | Minimum Detectable Difference, cm2 | MRI CSA (SD), cm2 | MRI ICC (95% CI) | MRI SEM (95% CI for muscle size), cm2 | Minimum Detectable Difference, cm2 | |
|---|---|---|---|---|---|---|---|---|
|
Tibialis Anterior 30% |
6.60 (1.20) |
0.996 (0.992, 0.998) |
0.085 (6.43, 6.77) |
0.236 | 6.88 (1.28) |
0.963 (0.930,0.980) |
0.250 (6.39, 7.37) |
0.693 |
| Tibialis Anterior 50% | 5.39 (1.28) |
0.985 (0.973, 0.992) |
0.162 (5.07, 5.71) |
0.449 | 5.69 (1.42) |
0.991 (0.982,0.995) |
0.135 (5.43, 5.95) |
0.374 |
| Tibialis Posterior 30% | 3.96 (1.01) |
0.998 (0.996, 0.999) |
0.045 (3.87, 4.05) |
0.125 | 4.18 (1.27) |
0.958 (0.921, 0.978) |
0.260 (3.67, 4.69) |
0.721 |
| Tibialis Posterior 50% | 3.44 (1.10) |
0.997 (0.995, 0.997) |
0.060 (3.32, 3.56) |
0.166 | 3.72 (1.33) |
0.999 (0.999, 1.00) |
0.013 (3.69, 3.74) |
0.036 |
| Flexor Digitorum Longus | 1.66 (.569) |
0.990 (0.983, 0.995) |
0.054 (1.55, 1.77) |
0.150 | 1.71 (.52) |
0.995 (0.990, 0.997) |
0.044 (1.62, 1.80) |
0.122 |
| Fibularis Longus | 5.26 (1.25) |
0.996 (0.993, 0.998) |
0.073 (5.11, 5.40) |
0.202 | 5.26 (1.14) |
0.998 (0.995,0.999) |
0.003 (5.25, 5.27) |
0.008 |
| Fibularis Brevis | 4.18 (.973) |
0.993 (0.987, 0.996) |
0.074 (4.03, 4.33) |
0.205 | 4.38 (.942) |
0.997 (0.994,0.998) |
0.003 (4.37, 4.39) |
0.008 |