Research Article
The Effect of an Open Carpal Tunnel Release on Thumb CMC Biomechanics
Table 1
Summary of mechanical properties for each combination of bones before and after open carpal tunnel release.
| | Measurement | Intact
(mean ± SD) | After release
(mean ± SD) | Difference
| value |
| | Rad-Met1 (adduction) (deg) | 2.2 ± 1.3 | 2.1 ± 1.6 | 6.6% | 0.69 | | Rad-Met1 (pronation) (deg) | 0.7 ± 0.6 | 0.7 ± 0.4 | −7.9% | 0.56 | | Rad-Met1 (dorsiflexion) (deg) | 3.5 ± 1.4 | 3.4 ± 1.5 | 3.0% | 0.78 | | Rad-Met1 (dorsal deviation) (mm) | 1.9 ± 1.6 | 2 ± 1.7 | −3.3% | 0.48 | | Rad-Met1 (subluxation) (mm) | 1.4 ± 0.7 | 1.5 ± 0.7 | −9.1% | 0.12 | | Rad-Met1 (ulnar deviation) (mm) | 1.5 ± 0.7 | 1.5 ± 0.6 | −5.5% | 0.54 | | Rad-Trap (adduction) (deg) | 1.9 ± 1.1 | 2.1 ± 1.2 | −10.2% | 0.17 | | Rad-Trap (pronation) (deg) | 2.9 ± 2.2 | 2.9 ± 2.4 | −0.9% | 0.83 | | Rad-Trap (dorsiflexion) (deg) | 2.0 ± 2.7 | 1.9 ± 2.3 | 4.1% | 0.70 | | Rad-Trap (dorsal deviation) (mm) | 1.3 ± 0.9 | 1.1 ± 0.8 | 11.0% | 0.13 | | Rad-Trap (subluxation) (mm) | 1.0 ± 1.1 | 1.0 ± 1.1 | −6.0% | 0.32 | | Rad-Trap (ulnar deviation) (mm) | 1.2 ± 0.5 | 1.3 ± 0.6 | −8.6% | 0.31 | | Trap-Met1 (adduction) (deg) | 9.0 ± 9.8 | 8.6 ± 8.8 | 5.1% | 0.60 | | Trap-Met1 (pronation) (deg) | 2.7 ± 1.7 | 2.6 ± 2.0 | 2.5% | 0.83 | | Trap-Met1 (dorsiflexion) (deg) | 12 ± 11.2 | 11.9 ± 11.2 | 1.3% | 0.80 | | Trap-Met1 (dorsal deviation) (mm) | 0.5 ± 0.2 | 0.6 ± 0.5 | −32.4% | 0.36 | | Trap-Met1 (subluxation) (mm) | 1.2 ± 1.2 | 1.2 ± 1.2 | −2.8% | 0.55 | | Trap-Met1 (ulnar deviation) (mm) | 0.7 ± 0.4 | 0.6 ± 0.4 | 5.3% | 0.39 | | Overall specimen stiffness (N/mm) | 48.9 ± 23.4 | 41.4 ± 18.4 | 15.3% | 0.11 |
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Rad-Met: radius to 1st metacarpal; Rad-Trap: radius to trapezium; Trap-Met: trapezium to 1st metacarpal.
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