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The curve on the left shows the results of cemented THA according to the period of implantation. The results of prostheses implanted in the early 1990ies, are slightly, but significantly inferior to those implanted the years 1987 to 1990. This corresponds to the time of conversion of surgical approach from the transfemoral Charnley to the direct lateral approach and also to the time of the disastrous Boneloc bone cement which was used in approximately 1400 patients. The results of uncemented THA have improved over the years, but are still clearly inferior to the cemented prostheses in the registry. The end-point in these analyses was exchange or removal of any part of he total hip, including the acetabular liner. Also with aseptic loosening as endpoint…and in young patients…, the overall results with uncemented THA are clearly inferior to the cemented total hips. The uncemented stems do quite well whereas the cups do not.