Periprosthetic fractures of the femur in primary total hip arthroplasty: a New Zealand Joint Registry analysis.

The rate of revision THA for periprosthetic femoral fracture is higher in uncemented femoral stems in the first 90 days, and is significantly associated with ASA score and morbid obesity. After 90 days, the rate is lower for uncemented femoral stems, but did not reach statistical significance.