The Biomet Bi-Metric total hip arthroplasty and universal acetabular cup: high polyethylene failure rate in the medium term.
We report on the medium-term results of the Bi-Metric (Biomet UK Ltd, Bridgend, UK) uncemented total hip arthroplasty system used with the Universal acetabular cup and polyethylene liner secured with the Ringloc (Biomet UK Ltd) mechanism. Fifty-eight total hip arthroplasties in 49 patients (mean age at implantation, 57.1 years) were identified, with 45 hips followed up at a mean of 7.6 years (range, 5-13 years). Of those hips not requiring revision, the mean Harris hip score was 89, 87% of the hips were judged to be very good or good according to d'Aubigne and Postel (J Bone and Joint Surgery 1954;36A:451), and the radiographic criteria by Engh et al (Clin Orthop Relat Res 1990;257:107) demonstrated the femoral components to be well fixed. Six patients required a revision procedure at a mean of 6.2 years postsurgery, with all failures attributed to marked wear of the polyethylene liner.
Isaac
David Llewellyn
DL
Eastbourne District General Hospital, Eastbourne, UK.
Forder
Justin
J
Skyrme
Andrew D
AD
James
Stephen E
SE
D000077:Acetabulum / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D013499:Surface Properties; D016896:Treatment Outcome
D020959:Polyethylene