Five to fourteen year interim results of uncemented total hip arthroplasty.

One thousand eight hundred eight uncemented total hip replacements have been performed during the last 14 years. The prototype and early models, 11-14 years later have retained a satisfactory result in 56% of cases, and the valgus prostheses, 6-11 years after implantation retain a satisfactory result in 85% of cases. The models in current use, with a standard neck shaft angle, and a range of implants to fit the medullary canal securely, have given a satisfactory result in 94% of patients in a one to 6 year survey. Of the whole series 101 hips (5.5%) have required further surgical treatment, mainly for interface pain but only 9 patients (0.5%) have finally ended with a resection-pseudarthrosis, all for infection. The overall results of the operation appear comparable with those of cemented metal on metal implants, but the frequency of minor discomfort on weightbearing is probably greater than that which follows a cemented on plastic articulation. Against this must be balanced the low risk of infection, and the ease with which revisional surgery can be performed.