Indication for Proximal Femoral Replacement is Associated with Risk of Failure

Published:January 12, 2022DOI:https://doi.org/10.1016/j.arth.2022.01.013

      Highlights

      • PFR failure was seen at a rate of 22.2% in the cumulative cohort.
      • PFR failure was more common following PFR for failed THA than neoplasm resection.
      • Indication for PFR was the only independent predictor for failure.

      Abstract

      Background

      Proximal femoral replacement (PFR) is reserved as a salvage procedure following failed total hip arthroplasty (THA) or after wide margin resection of tumors involving the proximal femur. Although failure of the PFR construct remains a significant problem, indication has not previously been investigated as a risk factor for failure.

      Methods

      This study retrospectively evaluated patients who underwent PFR over a consecutive fifteen-year period for primary sarcoma or metastatic disease of the proximal femur, compared to conversion to PFR after failed THA. PFR failure was defined as recurrent prosthetic dislocations, periprosthetic fracture, aseptic loosening, or infection that ultimately resulted in revision surgery.

      Results

      Overall, 99 patients were evaluated including 58 in the neoplasm and 41 in the failed THA cohorts. Failed THA patients were older (p<.001), with a greater proportion having comorbid hypertension (p=.008), cardiac disease (p=.014), and history of prior ipsilateral and intracapsular surgeries (p<.001). The failure rate was significantly higher in failed THA patients (39.0% vs 10.3%, p<.001) with significantly shorter implant survivorship on Kaplan-Meier analysis (p=.003). A multivariate Cox proportional hazards model showed that THA failure was the only independent predictor for PFR failure (HR: 4.26, 95% CI: 1.66 – 10.94; p=.003).

      Conclusion

      This study revealed significantly worse PFR implant survivorship in patients undergoing PFR for the indication of failed THA compared to neoplasm. While the underlying etiology of this relationship remains to be explicitly outlined, poor bone quality and soft tissue integrity, multiple prior surgeries, and comorbid conditions are likely contributing factors.

      Keywords

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