Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 23965
THE INFLUENCE OF THE SHELF AGEING OF GAMMA-IRRADIATION
STERILIZED ULTRA-HIGH MOLECULAR WEIGHT POLYETHYLENE IN BIPOLAR
HEMIARTHROPATHY FOR HIP OSTEOARTHRITIS
Katsutoshi HARA, Nobuhiro KAKU, Masashi MIYAZAKI, Hiroshi TSUMURA
Department of Orthopaedic Surgery, Faculty of Medicine, Oita University, Oita
(JAPAN)
This study aimed to elucidate the relationship among the shelf ageing of gammairradiation
sterilized ultra-high molecular weight polyethylene (UHMWPE) and the
acetabular change and the migration of bipolar head in bipolar hemiarthropathy for
hip osteoarthritis. 43 consecutive patients underwent bipolar hemiarthropathy for hip
osteoarthritis with IBC (3M). Their mean age was 60.2 years. The mean body height
was 149.7cm and their mean body weight was 53.1kg. The mean follow-up period
was 96 months. Fifteen hips were revised. The patients were classified into 2 groups
- SDS group (short duration stored group, < 30 months) or LDS group (long duration
stored group, 30 months) - on the basis of the duration from gamma-irradiation
sterilized UHMWPE to use. The following parameters were analyzed, body weight,
the size of outer head, the thickness of UHMWPE, the appearance of osteolysis and
the migration distance of bipolar head. The mean migration distance of bipolar head
in LD group were more than those in SD group with significant differences (p