Abstract
Of 20 shell prostheses inserted in cases of early coxarthrosis in our clinic during the period from mid-1976 to the end of 1978, three had to be removed. Morphological examinations, employing different techniques, were made of the coxa femoral ends which were removed. The foreign body reaction of the bone tissue beneath the cement within the prosthetic shell and the biomechanical response were investigated on the basis of macroscopic and microscopic structural analyses. Dependent upon the time elapsed, the exposed spongiosa surface was observed to have become remodeled to a thin cortical protective layer. Independent of time between insertion and removal of the prosthetic shell, a continuous wide layer, consisting of cellular and fibrous tissue, was formed between the bone and the cement (which remained intact) even after the formation of the above-mentioned cortical bone substrate.
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