Abstract
Seventeen cases with heightening of the greater trochanter in congenital dislocation of the hip were treated by transplantation of the greater trochanter. Of those cases, ten cases with acetabular dysplasia combined with Chiari's medial displacement osteotomy. The age at operation ranged from 9 to 33 years.Observation periods averaged 3.4 years. These cases were evaluated clinically and roentgenologically. The following roentgenological measurements were performed; 1) the CE angle 2) articulo-trochanteric-distance (ATD) 3) lever arm ratio.The clinical assessemt was made using Colton's point-soring system. The clinical assessment correlated with the postoperative CE angle and lever arm ratio except two cases but did not with ATD. Fourteen cases had good results but two cases poor because of weakness of the abductor muscle. In this report, trying to assess the quantitative fatigue of the abductors (m. gluteus medius) by means of dynamic spectrum analysis (frequency analysis) of EMG was introduced.
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