- West-Japanese Society of Orthopedics & Traumatology
- 整形外科と災害外科 (ISSN:00371033)
- vol.50, no.1, pp.170-173, 2001-03-25 (Released:2010-02-25)
One hundred twenty-nine median nerves of 105 cases were reviewed for variations during operations to treat carpal tunnel syndrome. The variations in the course of the motor branches (Poisel. 1974) were the extraligamentous type in 122 hands (94.6%), the subligamentous type in 2 hands (1.6%), and the transligamentous type in 5 hands (3.9%). Accessory branches were found in 10 hands (7.8%), a high division of the median nerve in 4 hands (3.1%) and median artery in 4 hands (3.1%). In 123 (95.3%) of 129 hands, the recurrent baranch arose from the radial aspect of the median nerve, in 3 hands (2.2%) from the central-radial aspect, in 3 hands (2.2%) from the central aspect, and in no hands from the ulnar side. To avoid the injuryy of the motor branches during operation of the carpal tunnel syndrome, special attention must be paid to the variation of the recurrent branch.