Table 1 Comparison of muscle CSA by MRI and US. Mean (SD), ICC, and SEM with confidence intervals for muscle CSA
From: Leg muscle cross-sectional area measured by ultrasound is highly correlated with MRI
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 |