Jumbo cups for repair of moderate-to-severe acetabular bone defects during revision of total hip arthroplasty: medium-term outcomes

Objective: To determine the medium-term clinical outcomes of revision surgery after total hip arthroplasty with jumbo cups in patients with Paprosky type II or type IIIA acetabular bone loss. Materials and Methods: We retrospectively reviewed 54 patients (54 hips) who underwent unilateral hip revision using jumbo cups in our institution between January 2007 and August 2012. The patients underwent clinical and radiographic evaluations before the revision surgery and at 3 months, 6 months, and 1 year after the revision surgery and every year thereafter. Harris Hip Score (HHS), Hip Disability and Osteoarthritis Outcome Score (HOOS), Short Form (36) Health Survey (SF-36) score, radiographic findings, and Kaplan-Meier implant-survivorship curves were evaluated. The operative findings and complications were also noted. Results: The patients were followed up for a mean of 5.3 years (range, 4-9 years). The mean HHS, HOOS, and SF-36 score had all significantly improved at the latest follow-up as compared with their preoperative values (P < 0.05). However, these scores did not significantly differ between patients with type II bone loss and those with type IIIA bone loss. Additionally, the HOOS and SF-36 score improved earlier than the HHS, indicating that the quality of life of the patients improved before hip-function recovery. The 5-year prosthesis-survival rate was 90.7%. Conclusion: Jumbo cups have similar satisfactory outcomes in both type II and type IIIA patients. The application of life-quality scales reveals early clinical improvement that may be useful to guide further recovery.