INTRA-OPERATIVE MIGRATION OF THE TRIAL FEMORAL HEAD DURING TOTAL HIP ARTHROPLASTY USING AN ANTEROLATERAL APPROACH

IntroductionMigration of the trial femoral head is a rarely occurring complication of total hip arthroplasty (THA) performed using the anterolateral approach (ALA). This migration of the trial femoral head under the rectus femoris is extremely risky because of the anatomical situation. Analyzing the morphological character of a case of migration may help us to avoid this risk.ObjectiveWe analyzed the three-dimensional bone morphology using computed tomography (CT) scan images to investigate the physiological characteristics of five migration cases.MethodsWe examined 108 patients (21 men, 87 women, 113 hips) who underwent THA via the ALA. The average patient age was 62.9 (range: 30–87) years and average body mass index was 24.4 (range: 18.0–36.0) kg/m2. The exclusion criteria were dysplastic coxarthroses greater than Crowe type II, previous fractures, previous hip operations, and muscle disease. Three-dimensional models of the pelvis and femur were made using ZedHip software® (Lexi, Tokyo, Japan). The ante...