초록접수[미리보기]

21KF-009
Prediction of carpal tunnel syndrome using the thenar muscle cross-sectional area by magnetic resonance imaging

Jungmin YiYoung UkKim

 

Department of Anesthesiology and Pain Medicine, Catholic Kwandong University of Korea College of Medicine, International ST. Mary`s Hospital, Incheon, Republic of Korea

Background: Carpal tunnel syndrome (CTS) is a common neuropathy. Although CTS progression is known to be associated with thenar muscle (TM) atrophy, the diagnostic value of TM atrophy for CTS has not been established. In this research, the thenar muscle cross-sectional area (TMCSA) was evaluated to analyze the relationship between the TMCSA and CTS. We assumed that TMCSA is a major diagnostic parameter in the CTS.
Methods: Both TMCSA and thenar muscle thickness (TMT) samples were acquired from 18 CTS patients, and from 18 control subjects who underwent wrist MRI with no evidence of CTS. T2-weighted transverse MRI images were obtained. We measured the TMCSA and TMT at the level of first carpometacarpal joint.
Results: The average TMCSA was 296.98 ± 49.39 mm2 in the normal group and 203.36 ± 72.13 mm2 in the CTS group. The average TMT was 8.54 ± 1.45 mm in the normal group and 7.38 ± 1.14 mm in the CTS group. CTS group had significantly lower TMCSA and TMT. Receiver Operator Characteristics curve analysis showed that the best cut-off point for the TMCSA was 260.18 mm2, with 77.8% sensitivity, 77.8% specificity. The best cut off-point of the TMT was 7.70 mm, with 61.1% sensitivity, 66.7% specificity.
Conclusion: Although the TMCSA and TMT were both significantly associated with CTS, the TMCSA was a much more sensitive measurement parameter. Thus, to evaluate CTS patients, the physician should more carefully inspect the TMCSA than TMT.