title: Management of types III and IV acetabular deficiencies with the longitudinal oblong revision cup.
abstract: Thirty-five longitudinal oblong revision (LOR) cups were used to reconstruct 29 type III and 6 type IV acetabular defects. Intraoperatively, we considered that cup contact was complete when we achieved a continuous contact between the cup periphery and the acetabular rim. When there were areas with a lack of contact, we considered that the contact was partial or incomplete. All patients were followed up for 4 to 8 years (mean = 6.3 years). At the latest follow-up, 30 cups were stable (85.8%) and 5 had migrated (14.2%). We found a significant relation between incomplete cup contact with the acetabular rim and subsequent failure (P = .042). The abduction angle was significantly increased in the group of unstable cups (P = .032) because of the migration of the acetabular component that became more vertical. Pain, limp, use of walking aids, functional level, and limb-length discrepancy significantly improved postoperatively (P < .0001). The Harris hip score improved from a mean preoperative score of 37 points to that of 79 points (P < .01). This implant showed satisfactory stability at early to midterm follow-up.
authors.affiliation: Service of Orthopedic and Trauma Surgery, Miguel Servet University Hospital, Zaragoza, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Herrera
authors.forename: Angel Antonio
authors.initials: AA
authors.lastname: Martínez
authors.forename: Jorge
authors.initials: J
authors.lastname: Cuenca
authors.forename: Vicente
authors.initials: V
authors.lastname: Canales
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D011183:Postoperative Complications; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D018709:Statistics, Nonparametric; D016896:Treatment Outcome