Abstract: Objective　To investigate the clinical effect of the first carpal metacarpophalangeal and dorsal radial ligament reconstruction with long hallus abdominis tendon flap in the treatment of the first carpal metacarpal dislocation.　Methods　From January 2015 to December 2019, five patients with the first carpal-metacarpal joint dislocation were treated with embole, Kirschner wire traction and fixation for arthroplasty, and the posterior oblique ligament and dorsal radial side of the first carpal-metacarpal joint were reconstructed with the long abdominis tendon flap ligament. Four weeks after operation, the fixation was removed and the Kirschner wire was removed to begin functional exercise. The operation effect was evaluated according to the X-ray films and the range of motion (ROM) of the thumb joint.　Results　Postoperative follow-up was 5 - 12 months (average 8 months). The last follow-up X-rays films showed no re-dislocation. ROM test showed that flexion and extension activities returned to normal in 4 cases. And one case had restricted contralateral palms.  Conclusions　Reconstruction of the first carpal metacarpal ligament using the long abductor hallucis tendon flap can restore joint stability and improve function.

Key words: Joint dislocation, 　Ligament reconstruction, 　First wrist and palm joint