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Partial hemiarthroplasty for the treatment of osteonecrosis of the femoral head. An experimental study in the dog

Ushio, K.; Oka, M.; Hyon, S.H.; Yura, S.; Toguchida, J.; Nakamura, T.

Journal of Bone and Joint Surgery. British Volume 85(6): 922-930

2003

ISSN/ISBN: 0301-620X
PMID: 12931820
Document Number: 560514
The use of a composite osteochondral device for simulating partial hemiarthroplasty was examined. The device was composed of a polyvinyl alcohol hydrogel and a titanium fibre mesh, acting as artificial cartilage and as porous artificial bone, respectively. The titanium fibre mesh was designed to act as an interface material, allowing firm attachment to both the polyvinyl alcohol gel (through injection moulding) and the femoral joint surface (through bony ingrowth). We implanted 22 of these devices into canine femoral heads. Histological findings from the acetabular cartilage and synovial membrane, as well as the attachment of the prosthesis to bone, were examined up until one year after operation. No marked pathological changes were found and firm attachment of the device to the underlying bone was confirmed. The main potential application for this device is for partial surface replacement of the femoral head after osteonecrosis. Other applications could include articular resurfacing and the replacement of intervertebral discs.

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