Low-friction arthroplasty with Boneloc bone-cement: outcome at 2 to 4 years.
We report the clinical and radiologic outcome of 109 Chamley low-friction arthroplasties implanted with Boneloc bone-cement (Biomet, Bridgend, South Wales, UK) into 104 patients. The mean follow-up was 30 months (range, 2-48 months). There were 72 women (mean age, 71 years) and 32 men (mean age, 72). Cartridge-packed cement was used in 37 cases and vacuum-packed cement in 72 cases. Survivorship analysis based on revision for aseptic loosening showed 79% survival at 4 years. Seventeen (15.5%) hips have been revised for aseptic loosening to date, in which all stems and 4 cups were loose. Extensive femoral osteolysis was always present and resulted in 4 cases of femoral cortical perforation at revision. Survivorship analysis based on revision and radiologic failure showed only 55% survival over the same period. When radiologic loosenings were included as failures, the vacuum-packed cement performed significantly worse than the cartridge-packed cement it replaced. These poor results were consistent with the withdrawal of Boneloc from clinical use in 1995, and we recommend indefinite follow-up for surviving prostheses.
Walczak
J P
JP
Eastbourne District General Hospital Trust, East Sussex, United Kingdom.
D'Arcy
J C
JC
Ross
K R
KR
James
S E
SE
Bonnici
A V
AV
Koka
S R
SR
Morris
R W
RW
D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008689:Methacrylates; D016016:Proportional Hazards Models; D011475:Prosthesis Failure; D012086:Reoperation; D015996:Survival Rate; D013997:Time Factors; D016896:Treatment Outcome
D001843:Bone Cements; D008689:Methacrylates; C073735:methylmethacrylate-n-decylmethacrylate-isobornylmethacrylate