title: Metal ion levels and functional results following resurfacing hip arthroplasty versus conventional small-diameter metal-on-metal total hip arthroplasty; a 3 to 5year follow-up of a randomized controlled trial.
abstract: We present an update of a randomized controlled trial on 71 patients (<65 years) who received either a resurfacing hip arthroplasty (RHA) (n=38) or cementless 28-mm metal-on-metal (MoM) total hip arthroplasty (THA) (n=33). Metal ion levels and functional outcome scores were analyzed with a mean follow-up of 58 months (SD 8.1). No clear shifts in relatively good outcome was encountered between RHA and THA. Metal ion levels appear to equalize between groups after 3 years. Median cobalt and chromium remained below 1.3 μg/L throughout follow-up in both groups. Six revisions were performed, of which three for pseudotumor formation (one THA, two RHA). In conclusion there were no clinical differences between the two groups and metal ion levels were lower than other series remained low, however, pseudotumor formation was not eliminated.
authors.affiliation: Department of Orthopaedics, Rijnstate Hospital, Arnhem, The Netherlands.
authors.forename: Pepijn
authors.initials: P
authors.lastname: Bisseling
authors.affiliation: Department of Orthopaedics, Rijnstate Hospital, Arnhem, The Netherlands.
authors.forename: José M H
authors.initials: JM
authors.lastname: Smolders
authors.affiliation: Department of Orthopaedics, Rijnstate Hospital, Arnhem, The Netherlands.
authors.forename: Annemiek
authors.initials: A
authors.lastname: Hol
authors.affiliation: Department of Orthopaedics, Rijnstate Hospital, Arnhem, The Netherlands.
authors.forename: Job L C
authors.initials: JL
authors.lastname: van Susante
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects; D002857:Chromium / Q000097:blood*; D003035:Cobalt / Q000097:blood*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D007477:Ions / Q000097:blood; D008297:Male; D061825:Metal-on-Metal Joint Prostheses; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000097:blood / Q000601:surgery*; D011474:Prosthesis Design; D016896:Treatment Outcome
chemical_list: D007477:Ions; D002857:Chromium; D003035:Cobalt
keywords: chromium; cobalt; metal ions; metal-on-metal bearing; resurfacing hip arthroplasty; total hip arthroplasty