A porous polyethylene-coated femoral component of a total hip arthroplasty.
The authors report their clinical experience with a femoral titanium stem with 3 mm of polyethylene (the outer 1.5 mm being porous) that was developed to function as a low-modulus type of prosthesis in an attempt to match the modulus of the prosthesis to the bone. The authors analyzed 223 of these stems of two different cross-sectional geometries: square (129) and round (94). Of these, 14 square and 5 round stems were subsequently replaced and all revealed only a fibrous ingrowth. Despite an average 82.4 Harris hip rating, 20% of the recipients still reported pain. For this reason the authors do not believe that the current design is adequate for the femoral component of a total hip arthroplasty.
Ritter
M A
MA
Center for Hip and Knee Surgery, Mooresville, IN 46158.
Keating
E M
EM
Faris
P M
PM
D000293:Adolescent; D000328:Adult; D000368:Aged; D001672:Biocompatible Materials; D001842:Bone and Bones / Q000503:physiopathology; D005069:Evaluation Studies as Topic; D005260:Female; D005269:Femur; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011095:Polyethylenes; D011474:Prosthesis Design; D011475:Prosthesis Failure; D014025:Titanium
D001672:Biocompatible Materials; D011095:Polyethylenes; D014025:Titanium