Cementless metal-on-metal hip arthroplasty in patients less than 50 years of age - Comparison with a matched control group using ceramic-on-polyethylene after a minimum 5-year follow-up

Thirty-nine cementless hip arthroplasties using metal-on-metal articulation were consecutively implanted in 30 patients less than 50 years of age and compared with a matched control group) (by age, diagnosis, Devane activity, and Harris hip scores) of cementless arthroplasties using ceramic-on-polyetbylene articulation. The Harris hip score at follow-up (minimum 5 years) for the metal-on-metal was 94.9 (range, 74-100). Alter the same follow-up, the results of the ceramic-on-polyethylene were significantly worse: 9 osteolyses and 7 surgical revisions related to wear (none in the rnetal-on-metal). Five-year survival rates were 97% +/-2% lor the ceramic-on-polyethylene and 100% for the metal-on-metal. The metal-on-metal may be recommended to prevent wear problems in younger and more active patients; however, a longer follow-up is required to confirm this encouraging data. Key words: cementless hip prosthesis, metal-on-metal, cobalt blood levels, young patients, osteolysis. (C) 2004 Elsevier Inc. All rights reserved.