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(b)
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Figure 1: Effect of hip rotation on the projected neck-shaft angle (NSA). The axial view of the femur in a CT reconstruction of a right hip is shown (a). Three coronal reconstructions are projected. Internal hip rotation of 0°, 30°, and 60° is demonstrated as shown in the axial view. The NSA is included and the overestimation of the projected NSA due to the rotation is visualized.