Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 26230
CT STUDY OF MAYO CONSERVATIVE HIP PROSTHESIS FOR HIP DISEASE
Ryosuke NAKANISHI, Takashi ATUMI, Satoshi TAMAOKI
Department of orthopaedic surgery, Showa University, Fujigaoka Hospital,
Yokohama City (JAPAN)
Bone changes from simple X rays and the CT image of the case who was able to do
the observation of the passage of two years or more was examined after the hip
replacement arthroplasty done by using Mayo conservative hip prosthesis for the
osteoarthritis and osteonecrosis of the femoral head under 55 years old.17 hips in 15
patients. Average age of the patients was 44.2 years old, with 7 women and 8 men.
The average follow-up of the whole series was 33.1 months. In the cause of turning
on, 12 hips were osteonecrosis of the femoral head, and 3 were osteoarthritis. We
examined the appearance of spot welds and Stress shilding from simple X-ray
images and the CT image. Spot welds appeared in 15 hips (88%) in 8.4 months on
the average on anteroposterior X-ray, and fromed from proximal to distal of the
femoral shaft. From MPR of the CT images that had done in 5.6 years of the average
after the operation, spot welds were formed all. Stress shilding was formed in 4 hips
(23.5%). Therefore, we considered an excellent load transmitting of this stem. It
seemed that CT after the total hip arthroplasty was useful.
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