The Charnley prosthesis had by far the best and most comprehensive evidence base with better than 90 % implant survival after about 10 years .
Some uncemented stems have shown promising medium-term outcome , but no combination of uncemented cup and stem fulfilled the benchmark criterion of > or = 90 % implant survival at 10 years , which we propose as a minimum requirement for unrestricted clinical use for prostheses used in primary THR .
We have conducted a systematic review of the scientific literature concerning outcome and clinical effectiveness of  prostheses used for primary total hip replacement ( THR ) in Norway .
Rheumatoid arthritis and hydroxyapatite-coated hip prostheses: five-year results. International ABG Study Group.
Medium- and long-term results from  cemented total hip arthroplasty ( THA ) in patients with rheumatoid arthritis ( RA ) show a higher incidence of infection and aseptic loosening when compared to other diagnoses . Early results using uncemented prostheses are variable . Hydroxyapatite ( HA ) coatings are thought to improve early osseointegration in uncemented THA . In a prospect i ve , international , multicenter clinical study , 32 RA patients who received 33 uncemented HA-coated prostheses  were followed up for a minimum of 5 years . Medium-term clinical results are excellent . No infection or aseptic loosening has been recorded . Excellent osseointegration was observed radiographically . Bone remodeling was consistent with mainly proximal to midstem stress transfer . We conclude that uncemented , proximally HA-coated prostheses are a promising alternative to cemented prostheses for RA patients
The Charnley prosthesis had by far the best and most comprehensive evidence base with better than 90 % implant survival after about 10 years .
Some uncemented stems have shown promising medium-term outcome , but no combination of uncemented cup and stem fulfilled the benchmark criterion of > or = 90 % implant survival at 10 years , which we propose as a minimum requirement for unrestricted clinical use for prostheses used in primary THR .
We have conducted a systematic review of the scientific literature concerning outcome and clinical effectiveness of  prostheses used for primary total hip replacement ( THR ) in Norway .