title: Midterm results of Metasul metal-on-metal total hip arthroplasty.
abstract: We assessed 106 total hip arthroplasties performed with a new metal-on-metal hip system; the patients were monitored for at least 5 years. The average Harris Hip Score of the patients was 39.5 points before surgery and 87.8 points at final follow-up evaluation. Radiographically, the acetabular component was stable in 103 hips and possibly unstable in 3 hips. The femoral component was bone ingrown in 97 hips and stable and fibrous in 9. After surgery, 6 hips dislocated. The polyethylene liner dissociated in one patient. No patient exhibited clear signs of loosening, migration, or osteolysis. Distal femoral cortical hypertrophy was seen in 35.8% of the cases. Survival at the mean follow-up point (6.4 years) was 99.1%. There was no significant difference in serum chromium concentration between metal-on-metal bearings and polyethylene-on-metal bearings (control subjects). This study found that metal-on-metal total hip arthroplasty produces excellent midterm results.
authors.affiliation: Department of Orthopedic Surgery, Nihon University School of Medicine, Tokyo, Japan.
authors.forename: Shu
authors.initials: S
authors.lastname: Saito
authors.forename: Junnosuke
authors.initials: J
authors.lastname: Ryu
authors.forename: Masahiko
authors.initials: M
authors.lastname: Watanabe
authors.forename: Takao
authors.initials: T
authors.lastname: Ishii
authors.forename: Kaichiro
authors.initials: K
authors.lastname: Saigo
mesh_terms: D000077:Acetabulum; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation; D002857:Chromium / Q000097:blood; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography
chemical_list: D002857:Chromium