Significance of proximal femoral computed tomography scanning in the prediction of femoral prosthesis before total hip arthroplasty.

Femoral prosthesis before total hip arthroplasty (THA) predicted by Proximal Femoral CT scanning. Prior to THA, 61 hip bones in 52 cases were scanned by CT to measure the minimum inner diameter of cavum medullare in femur isthmus. The corresponding type of femoral prosthesis was selected according to the size of the cavum medullares. The conventional template measuring method was used as a contrast. The minimum inner diameter of cavum medullare in femur isthmus and the medial diameter of cavum medullare of resected femur had strong correlation with the type of femoral prosthesis (r = 0.97-0.99, P < 0.05). In terms of pre-operative femoral prosthesis selection, the CT-based isthmus-measuring method had an excellence rate of 47.5%. This method had an excellence rate of 52.5%. The CT-based resected-femur-measuring method had better accuracy in pre-operative femoral prosthesis selection for the patients.