A Modified Ogata-Goldsand Technique for Simplified Intraoperative Measurement of Femoral Version

BACKGROUND Femoral anteversion can be difficult to determine intraoperatively, particularly in cases with complicated deformity. Although biplanar methodology exists for measuring femoral anteversion, the measurements are generally based on the proximal femur, without consideration for the femoral bow. METHODS We directly measured femoral version in 70 mature cadaveric femora. Using the standard Ogata-Goldsand approach, femoral version was geometrically calculated after measuring apparent neck-shaft angle and the β-angle, which is the angle between the femoral neck and proximal femoral shaft on a direct lateral view. We then used a modified β-angle, measured between the femoral neck and a line representing the entire femur. RESULTS Mean anatomic femoral anteversion was 20±11 degrees. Mean calculated femoral version using the standard Ogata-Goldsand technique was 32±13 degrees, whereas mean calculated femoral version using the modified Ogata-Goldsand technique was 22±12 degrees. Repeated measures ANOVA analysis found an overall statistically significant difference between the 3 groups (P