In order to examine the factors which influence the prognosis of the tardy ulnar palsy, the follow-up study was done.
Materials consists of 64 cases which were terated with some operative procedures such as anterior transfer, the King's method etc. The postoperative duration of these cases ranged from 6 months to ten years (average; 3 years and one month).
Clinical results at the last examination were evaluated by the modified Mizumura and Akahori's method. And the relationship between the results and the age of the patients, period from onset of symptome to operation, the degree of the preoperative palsy and the motor conduction velocity (MCV) were discussed.
Good and excellent results were obtained 71.4% of 64 cases. These results were correlated with the age of the patients, period from onset to operation. However, the most important factor which decided the final results was the degree of the preoperative plasy.
The statistical analysis showed that the result of cases with more than 41m/sec of MCV was better than that of cases with less than 20m/sec of MCV. But, it was difficult to conjecture the prognosis by using only the value of the preoperative MCV.
