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The mean (± SD) of the first dorsal interosseous muscles physiological cross-sectional area (PCSA), tendon CSA (TCSA), and the ratios of PCSA/TCSA, Lt/Lfopt, and Lfopt/r, where r is the moment of the muscle. The number of samples for each parameter is given in parentheses.
| Parameter | Mean ± SD |
|---|---|
| PCSA (cm2) (n = 17) | 1.8 ± 0.6 |
| TCSA (cm2) (n = 12) | 0.2 ± 0.2 |
| PCSA/TCSA (n = 12) | 21.7 ± 26.3 |
| Lt/Lfopt (n = 13) | 0.2 ± 0.3 |
| Lfopt/r (n = 8) | 16.5 ± 9.2 |
