Radiographic measurements of the femur are commonly used in the design of femoral prostheses and in preoperative planning and follow-up of hip arthroplasty patients. In this study, a canine model was used to test the accuracy of radiographic measurements of the proximal femur. The femoral canal width of seven purebred greyhounds was measured on anteriorposterior and lateral radiographs. These dimensions were compared to direct measurements of metal casts of the proximal medullary canal. The mean difference between the two methods of measurement was .07 cm in the AP view and.05 cm in the lateral view, with an error of 4.5% and 3.9% respectively. Identifying potential sources of measurement error should lead to improved standardization of X-ray technique, thus allowing a more meaningful evaluation of research data and individual patient radiographs. © 1987.
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