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Digit flexibility and range of motion in carpal tunnel syndrome

This study investigated effects of carpal tunnel syndrome (CTS) on digit flexibility and range of motion. Twelve healthy, right-handed subjects attended the experiment (6 patients with CTS and 6 healthy controls). The digit flexibility was tested through a Purdue Pegboard Test and the digit's range of motion was tested in process of thumb opposition and thumb circumduction movements. Kinematic signals during thumb movement was recorded using an electromagnetic motion capture system. Additional hand sensorimotor function was assessed using finger sensitivity test, grip strength test and pinch strength tests). The path lengths and interphalangeal (IP) joint angles during thumb opposition and circumduction movements were calculated. Results showed that the path lengths and the angle of the IP joint were significantly lower in the CTS patients compared with controls. At the same time we also found that control group has higher sensitivity than CTS group. There is no obvious change trend for the pinch strength test and grip strength test.