| Tardy Ulnar Nerve Palsy due to Cubitus Varus Deformity |
| In-Ho Jeon, M.D., Poong-Taek Kim, M.D., Byung-Chul Park, M.D., Joo-Chul Ihn, M.D. |
| Department of Orthopaedic Surgery, School of Medicine,
Kyungpook National University Hospital, Daegu, Korea |
| 내반주 변형에 의한 지연성 척골 신경 마비 |
| 전인호, 김풍택, 박병철, 인주철 |
| 경북대학교 의과대학 정형외과학교실 |
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| Abstract |
Purpose
: Cubitus varus deformity has been reported to cause ulnar neuropathy. We present five cases of tardy ulnar nerve palsy due to cubitus varus and analyzed the factors related to the nerve palsy caused by the deformity. Materials and Methods : Three men and two women were reviewed retrospectively and the mean age of the patients were 26 (range, 14-38). The average interval from initial fracture to nerve palsy was 19 years (8-32 years). The severity of symptoms, according to McGowan’s classification, was grade I of 2 patients, grade II of 3 patients. Carrying angle was an average of 18°(30°-45°). Internal rotation angle measured by Yamamoto’s method was an average of 33°(30°-45°). Results : The mean follow-up period was 53 months (35-70 months). Elbow pain and numbness of the fingers were relieved shortly after surgery. It revealed that anterior subluxation of the nerve due to internal rotation deformity and compression of the nerve between the medially shifted medial head of triceps and the medial epicondyle. Conclusion : The major entrapment point of the nerve is the fibrous band between the two heads of the flexor carpi ulnaris. The severe internal rotation deformity may contribute the cause of tardy ulnar nerve palsy in cubitus varus deformity. |
| Key Words:
Tardy ulnar nerve palsy, Cubitus varus, Internal rotation, Anterior transposition |
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