Fig. 3. Three-dimensional neck-shaft angle of real bone models with neutral and 20° varus rotation position.
A neutral position shows frontal neck-shaft angle of 128° (A), sagittal neck-shaft angle of 15° (B), and transverse neck-shaft angle of 14° (C). With 20° varus rotation in the frontal plane, shows the change of the frontal neck-shaft angle to 108° (D), sagittal neck-shaft angle to 17° (E), and transverse neck-shaft angle of 10° (F).