A preliminary study on the reinnervation effect of the Riche-Cannieu anastomosis

Abstract

Objective To study whether the abductor pollicis brevis been effected by the reinnervation of the Riche-Cannieu anastomosis in the median nerve injury cases. Methods Collect 43 cases (29male,14 female,mean age 32.6) corresponds with the study needs: (1)The traumatic median nerve injury (proved by the results of electrophysiological examine and the clinic diagnose)on or below the forearm.(2)The existence of RCA was verified by the electrophysiological examine results,and the amplitude of electric potential was under 1mv.(3) Rule out the cases with the other injure of nerve or nervous system disease and cervical vertebra disease,diabetes patient.The analysis base on the results of 43 case's periodical examine,the periodical criteria as following: within 2-4th week,within the 2-4th month and 1 year after the injury.Results Forty-three cases had not obvious recovery indication of the median nerve under the clinical and electrophysiological aspect,eight cases of abductor pollicis brevis function improved quickly in 3 months,the relevant CMAP amplitude of Riche-Cannieu anastomosis increased apparently,the EMG (Electromyography)results of abductor pollicis brevis ameliorated accordingly. Conclusion In the case of RCA combined with the median nerve injury,the abductor pollicis brevis fibra might be dominated by RCA reinnervation when losing domination of median nerve,the reinnervation process will much faster than the regeneration process of the broken nerve. Key words: Median nerve ; Riche-Cannieu anastomosis ; Abductor pollicis brevis ; Reinnervation ; Electrophysiological examine