Osteolysis and aseptic loosening do occur not only in cemented total hip arthroplasties but also in cementless ones. Recently, osteolysis became the main comcern in total hip arthroplasty. Numerous articles, proving particulate
debris, such asl, polyethylene, PMMA, and metal particles cna imduce osteolysis, have been published.
We examined ten hips had received either cemented or cementless hip arthroplasty. We examined osteolytic lesions radiographically and microscopically and tried to find out the differences in biopsy findings between osteolytic lesions after cemented and dcementless arthroplasty.
The results were as follows
1) Acetabular osteolysis occurred in 4 hips with cemented totlal hip arthroplasty, and two hips with cementless one.
2) Femoral ostelysis developed in 4 hips with cemented total hip arthroplasty, and three hips with cementless one.
3) A similar histopathologic findings of foreign body reactions in cemented and cementless arthroplasty were found.
4) A foreign body reaction is stronger in cemented arthroplasty than cementless arthroplasty.
5) The polyethylene was a main suource of osteolysis in both cemented and cementless arthroplasty.
6) The foregin body reaction was found in all lesions of osteolysis after cemented and cementless arthroplasties, the inflammatory reaction was considered as cell-mediated immune reaction
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