[Research progress in Cup-cage reconstruction for patients with chronic pelvic discontinuity after total hip arthroplasty].

Objective: To summarize research progress on application of Cup-cage reconstruction in revision of chronic pelvic discontinuity (CPD) in patients undergoing total hip arthroplasty (THA). Methods: Relevant literature at home and abroad in recent years was reviewed to summarize the principles of the Cup-cage reconstruction, preoperative patient assessment, intraoperative skills, clinical and radiological effectiveness, limitations, and postoperative complications. Results: For the treatment of CPD, the Cup-cage reconstruction achieved long-term acetabular cup bone ingrowth, CPD healing, and biologic fixation of the prosthesis by restoring pelvic continuity. Preoperative evaluation of the surgical site and general condition is necessary. The main intraoperative objectives are to reconstruct pelvic continuity, restore the center of rotation of the hip, and avoid neurovascular injury. Current studies have demonstrated significant clinical and radiological effectiveness as well as acceptable prosthesis survival rates after operation. Nevertheless, there is a lack of evidence regarding the staging of CPD, the optimal surgical approach and internal fixation, and the factors influencing postoperative prosthesis survival remain undefined. Conclusion: Cup-cage reconstruction can be an effective treatment for CPD after THA, but there is still a need to explore CPD staging, Cup-cage approach and internal fixation, and influencing factors on prosthesis survival.