The clinical evidence behind the current implants used for proximal femoral fractures is weak considering the number of implants used worldwide .
Sporadic evaluation is not sufficient to identify long term problems .
INTRODUCTION Evaluation of the long-term performance of  implants used in trauma surgery relies on post-marked clinical studies since no registry based implant assessment exists .
The purpose of this study was to evaluate the evidence of performance of implants  currently used for treating proximal femoral fractures ( PFF ) in Denmark .
Intertrochanteric femoral fractures. Mechanical failure after internal fixation.
In a prospect i ve study we assessed the causes of mechanical failure in a series of 230 intertrochanteric femoral fractures which had been internally fixed with either a sliding hip screw or a Küntscher Y-nail .  The overall rate of mechanical failure was 16.5 % ; cutting-out of the implant from the femoral head was the cause in three-quarters of the instances . Implants placed posteriorly in the femoral head cut out more often ( 27 % ) than those placed central ly ( 7 % ) . The cut-out rate was also determined by the quality of the fracture reduction , but age , walking ability and bone density ( assessed by the Singh grade and metacarpal indices ) had no significant influence . We conclude that these fractures should be reduced as accurately as possible and it is imperative that the implant is placed central ly within the femoral head
The clinical evidence behind the current implants used for proximal femoral fractures is weak considering the number of implants used worldwide .
Sporadic evaluation is not sufficient to identify long term problems .
INTRODUCTION Evaluation of the long-term performance of  implants used in trauma surgery relies on post-marked clinical studies since no registry based implant assessment exists .
The purpose of this study was to evaluate the evidence of performance of implants  currently used for treating proximal femoral fractures ( PFF ) in Denmark .