title: Migration of the acetabular component after revision with impacted morselized allografts: a radiostereometric 2-year follow-up analysis of 21 cases.
abstract: In a consecutive series of hip revisions due to mechanical loosening, using impacted morselized allografts and cement, we followed 21 acetabular components by radiostereometric analysis (RSA) during 2 years. All but 1 acetabular component migrated in the proximal direction (median 2.1 (0.5-6.4) mm). 6 components migrated in the medial direction (median 0.8 (0.4-1.2) mm) and 6 in the lateral (median 0.8 (0.4-2.0) mm). 14 components migrated in the posterior direction (median 0.8 (0.3-2.3) mm) and 1 in the anterior 0.6 mm. The migration rate gradually decreased in all directions, but 7 acetabular components still migrated in at least 1 direction (median 0.3-0.6 mm) between 1.5 and 2 years postoperatively.
authors.affiliation: Department of Orthopedics, Hässleholm-Kristianstad County Hospital, Hässleholm, Sweden. ewald.ornstein@mailbox.swipnet.se
authors.forename: E
authors.initials: E
authors.lastname: Ornstein
authors.forename: H
authors.initials: H
authors.lastname: Franzén
authors.forename: R
authors.initials: R
authors.lastname: Johnsson
authors.forename: P
authors.initials: P
authors.lastname: Sandquist
authors.forename: A
authors.initials: A
authors.lastname: Stefánsdóttir
authors.forename: M
authors.initials: M
authors.lastname: Sundberg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D016025:Bone Transplantation; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D012086:Reoperation; D014184:Transplantation, Homologous