Abstract
OBJECTIVE: Total hip arthroplasty (THA) preoperative planning requires the calibration of X-ray. We evaluate the magnification in standard pelvis hip X-ray and determine its relation with biometric factors. METHODS: The magnification of 140 THA X-ray were calculated with the known femoral head (MF(FH)) and acetabular component (MF(AC)). Gender, age, height, weight, and BMI were correlated to the magnification. RESULTS: The MF(FH) and MF(AC) were 113.2 ± 4,4 and 113,4 ± 3,6 respectively. No significant differences by gender and no correlation with height, weight or BMI. CONCLUSION: The X-ray magnification should be calibrated in every institution to improve the accuracy of preoperative planning.