The Effect of Trochanteric Epiphysiodesis in Patients Who \rUnderwent Tönnis Triple Innominate Osteotomy for LeggCalve-Perthes Disease

Objective: To comparatively evaluate the clinical and radiographic outcomes of performing Tönnis triple innominate osteotomy \r(TIO) with or without greater trochanteric epiphysiodesis (TE).\rMaterials and Methods: A total of 37 patients (8 females and \r29 males) were enrolled in this retrospective study. Out of them, \r14 patients (3 females and 11 males) underwent TE with TIO \r(TIO+TE group) and 23 patients (5 females and 18 males) underwent TIO only (TIO group). For all patients, the range of motion, \rleg length discrepancy, and Trendelenburg sign of the affected \rhips were assessed both preoperatively and at the last control.\rResults: At the last control, the mean hip abduction and adduction in the TIO group were significantly higher than those in \rthe TIO+TE group. In terms of Trendelenburg sign and leg length \rdiscrepancy, no significant difference was observed between \rgroups. Although the difference in center-trochanteric distance (CTD) between the affected and normal sides was higher \rin TIO+TE group preoperatively, the difference in articulo-trochanteric distance, CTD, and abductor lever arm length values \rwas the same in the two groups at the latest follow-up.\rConclusion: The results of this study showed that additional TE \rsignificantly improved CTD especially in patients who had preoperatively lower CTD values compared to the healthy side.