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Dislocation of the femoral component is a common complication of total hip arthroplasty. In 44% of cases it results from the incorrect position of implant components. The aim of the study was to evaluate the efficacy of the elaborated method for determination of implant components position at preoperative planning of revision hip arthroplasty in recurrent dislocations of the femoral component. Thirty patients aged 25 - 75 years with recurrent femoral component dislocation after primary hip arthroplasty were examined. To verify the dislocation a plain anterior-posterior roentgenogram of pelvis was performed followed by MSCT of pelvis, femoral bones and knee joints. Drawing up of necessary lines and angles enabled to evaluate objectively the correctness of hip implant components position. By measurement results all patients were divided into 3 groups and in each group an appropriate type of surgical intervention was used. The proposed methods of preoperative planning enabled to determine objectively the cause of femoral component dislocation, to choose an adequate variant of surgical intervention and to exclude the risk of femoral component dislocation recurrence in 96.7% of cases.

Dislocations of the Femoral Component of Hip Implant: Determination of Spatial Relative Position of Components