The Prognosis of Operation for Tardy Ulnar Nerve Palsy

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The records of 22 cases of tardy ulnar nerve palsy in 22 patients have been reviewed an average of 3, 4 years after operation from 1971 to 1979.An operative prognosis for the patients who were treated surgically within 3 months from the onset of ulnar nerve palsy is excellent, although preoperative examination of EMG or MCV revealed an abnormal findings. The patients who were operated between 3 months and 12 months from the onset were divided into two groups due to a difference in prognosis; An excellent prognosis was seen in the patients of group I, who showed normal NMU voltage, or high amplitude voltage with over MCV 41m/sec. The patients of group II had poor prognosis, who showed low amplitude voltage, or high amplitude voltage with below MCV 20m/sec in preoperative examination. An poor operative prognosis was seen not necessarily consistent with the findings of preoperative examinations of EMG and MCV for the patients for whom surgery was done after 12 months or more from the onset.In conclusion, the most effective factors on a postoperative prognosis for ulnar nerve palsy are the preoperative time from the onset and the grade of preoperative palsy examined by EMG and MCV.
西日本整形・災害外科学会の論文