Experience with bioceramic implants in orthopaedic surgery.

In the period from 1974 to March 1980 bioceramic endoprostheses were implanted in 155 patients. 94 patients were suffering from degenerative hip diseases and 61 had been operated for malignant bone tumours. The majority of the total endoprostheses consisted of a ceramic socket and a metal shaft prosthesis with ceramic head attached to it. Bioceramic double-cup prostheses were implanted in 19 patients without using bone cement. Following resection of malignant bone tumours, the proximal humerus and the proximal femur were replaced by special bioceramic endoprostheses. The post-operation period after implantation has reached 70 months in the case of tumour endoprostheses (average 22 months) and up to 49 months in the case of hip joint endoprostheses (average 24 months). The analysis deals exclusively with complications specific to the ceramic material. These complications are: breakage of the ceramic head (8 X), loosening of the ceramic cup (13 X) and pseudarthrosis of the cone connection in tumour endoprostheses (9 X). Abrasion particles were found in all cases which we were able to follow up histologically.