Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 26233
THE CLINICAL RESULTS OF MODIFIED TRANSTROCHANTERIC CURVED
VARUS OSTEOTOMY FOR OSTEONECROSIS OF THE FEMORAL HEAD
Tamaoki SATOSHI, Atsumi TAKASHI, Nakanishi RYOUSUKE
Department of Orthopaedic Surgery, Fujigaoka Hospital Showa University School of
Medicine, Yokohama (JAPAN)
Objective: Since 2004, in addition to original curved varus osteotomy (CVO) for
Idiopathic osteonecrosis of the femoral head (ION), we have intentionally performed
anterior or posterior rotation without incising the articular capsule to obtain a more
extensive, viable area in the loaded portion. In this study, we investigated the extent
of the viable area loaded portion after original and modified CVO. Methods: The
subjects were 34 patients (18 males, 16 females, 38 joints) who underwent curved
varus osteotomy. From these patients, 12 patients (14 joints) underwent a modified
CVO. The mean rate of the viable area for the loaded portion on anteroposterior
radiographs before surgery was 33%. Investigations were performed on the percent
viable area in the preoperative/postoperative weighted portion. In addition, in patients
for whom transtrochanteric curved varus osteotomy was combined with
anterior/posterior rotation, we measured the extent of viable area in the loaded
portion when the extent of curved varus osteotomy without rotation was performed
based on a schematic drawing that we prepared. Results: In this study, the
combination of CVO and anterior/posterior rotation significantly increased the percent
viable area from 65% to 84%. Conclusion: The modified curved varus could be a
vilable approach for patients with a viable area in the anterior or posterior region.
The extent of post operative viable area on the loaded portion proved to be better
than the original procedure.
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