Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 25283
RAPID PROTOTYPING FOR TRANSTROCHANTERIC ANTERIOR ROTATIONAL
OSTEOTOMY OF THE FEMORAL HEAD.
Ikuo KAWAHARA, Kenji KAWATE, Tomoyuki UEHA, Yasuhito TANAKA
Deprtment of Orthopaedic Surgery, Nara Medical University, Kashihara City, Nara
(JAPAN)
Transtrochanteric anterior rotational osteotomy of the femoral head (ARO) for
osteonecrosis of the femoral head was invented by Sugioka. Although the operation
has been provided good clinical course to these patients, the procedure is quite
complex and can be considered as difficult operation. In most of the cases, femoral
neck is need not only just rotation but also varus position to gain more unaffected
area in load area of the acetabular. Pre-operative planning for this operation is
recommended with two X-ray images of both hip joints, but inexperienced surgeons
are not able to gain clear images of the movement of rotated femoral head on the
paper. For better pre-operative planning we produced 3D solid hip joint models to
simulate this operation pre-operatively. METHOD: From 2008 to 2006, six AROs
were done at our hospital. Mean age was 40 years, twowere female and three were
male patients. One male patient was done ARO in both sides. All hips were Ficat
Stages 3, Enneking`s Stage 4. Patients were scanned on CT at 1mm intervals along
a cranio-caudal axis, with the scanning field focused on the affected hips. The
DICOM format CT data were processed on PC with the 3D modellar software to the
STL format CT data, and then sent off to 3D printer to make 3Dmodels. Preoperative
simulations were performed with these 3D models. CONCLUSION: With
full-scale 3D model, could 1) evaluate three-dimensional necrosis area easily, 2)
reproduce the plan precisely,, 3) gain confidence before operation
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