ABSTRACTpurpose. To propose a novel method to measure the neck shaft angle and anteversion of the femur using anteroposterior and 45º oblique radiographs. Methods. Three human subjects were used to verify the 45º oblique method. The true neck shaft angle and anteversion of the femur were determined using computed tomography. The true values were compared with the values derived by the 45º oblique method after correcting the distortion using a formula. results. With the true values based on computed tomography as references, the neck shaft angle and anteversion of the 3 subjects deviated +0.82º to +4.66º and -2.14º to +2.55º in lateral 45º oblique radiographs, respectively, whereas the corresponding values in medial 45º oblique radiographs were +0.98º to +5.93º and -10.09º to +1.58º. The lateral 45º oblique method resulted in smaller range of deviation and were more accurate. conclusion. This 45º oblique method is useful in surgical planning, especially for femoral derotational A 45-degree radiographic method for measuring the neck shaft angle and anteversion of the femur: a pilot study
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