Polyethylene wear in uncemented acetabular components.
We measured polyethylene wear in 231 porous-coated uncemented acetabular cups. We divided the hips into two groups according to the fixation of the femoral component, by cementing (n = 97) or press-fit (n = 134). Follow-up was from three to five years. The patients in two sub-groups were matched for weight, diagnosis, sex, age and length of follow-up. The linear wear rate of cups articulated with uncemented femoral components (0.22 mm/year) was significantly higher than the wear rate (0.15 mm/year) of cups articulated within cemented femoral components (p < 0.05). These results can be compared with previously reported wear rates of 0.08 mm/year for cemented all-polyethylene cups and 0.11 mm/year for cemented metal-backed cups. The higher wear rates of uncemented arthroplasties could jeopardize the long-term results of this type of hip replacement.
Hernandez
J R
JR
Center for Hip and Knee Surgery, Mooresville, Indiana 46158.
Keating
E M
EM
Faris
P M
PM
Meding
J B
JB
Ritter
M A
MA
D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D003343:Corrosion; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D011095:Polyethylenes; D011474:Prosthesis Design; D011859:Radiography; D014025:Titanium
D011095:Polyethylenes; D014025:Titanium