title: Total hip acetabular component position affects component loosening rates.
abstract: Loosening is the most common long-term problem following total hip arthroplasty. Many factors, including patient selection, cement technique, femoral component placement, and prosthesis design reportedly affect the incidence of loosening. Theoretically, the location of the hip center of rotation substantially affects the load on the hip, and superior and lateral hip center location will result in higher loads than medial and inferior placement. Long-term follow-up studies (average, 9.1 years after surgery) using logistical regression analysis demonstrate significantly higher rates of femoral loosening with acetabular components placed in a superior and lateral (i.e., nonanatomic) position, compared with acetabular components placed in a nearly anatomic position.
authors.affiliation: Department of Orthopaedic Surgery, University of Iowa, Iowa City 52242.
authors.forename: S A
authors.initials: SA
authors.lastname: Yoder
authors.forename: R A
authors.initials: RA
authors.lastname: Brand
authors.forename: D R
authors.initials: DR
authors.lastname: Pedersen
authors.forename: T W
authors.initials: TW
authors.lastname: O'Gorman
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004868:Equipment Failure; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D011859:Radiography