Cup-Cage Reconstruction for Pelvic Discontinuity: Encouraging Long-Term Survival

Area of Science:

• Orthopedic Surgery
• Arthroplasty Research
• Biomedical Engineering

Background:

• Pelvic discontinuity (PD) presents significant challenges in revision total hip arthroplasty.
• Limited evidence exists on the long-term outcomes of cup-cage constructs for PD.

Purpose of the Study:

• To evaluate the survivorship and clinical outcomes of cup-cage constructs used for pelvic discontinuity in revision total hip arthroplasty.
• To assess radiological failures and patient-reported outcomes at 5-10 years post-surgery.

Main Methods:

• Retrospective review of 48 cup-cage revisions for PD with a minimum 2-year follow-up.
• Kaplan-Meier analysis for all-cause and aseptic loosening re-revision survival.
• Assessment of radiological failures and patient-reported outcome measures (WOMAC, Oxford Hip Score).

Main Results:

• All-cause re-revision survival was 80% at 5 years and 68% at 10 years.
• Aseptic loosening re-revision survival was 95% at 5 years and 85% at 10 years.
• Patient-reported pain and function scores were acceptable, despite a 27% re-revision rate.

Conclusions:

• Cup-cage reconstruction demonstrates encouraging 5-10 year survivorship for pelvic discontinuity.
• This technique offers acceptable patient-reported outcomes and serves as a viable solution for complex revision hip arthroplasty cases.