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. 2015 Mar 31;27(1):23–29. doi: 10.5371/hp.2015.27.1.23

Fig. 5. Flexion (β0<β1) osteotomy with the rotation axis X results in varus change (v0>v1) and increased anteversion (γ0<γ1) of femoral head.

Fig. 5

Z coordinate is increased (z0<z1), Y coordinate is decreased (y0>y1), and X coordinate is not changed (x0=x1). Therefore, angle of flexion and anteversion is increased (β0<β1, γ0<γ1) and valgus angle (v0>v1) is decreased.

H0 and H1: Center of femoral head before and after flexion osteotomy.

v0 and v1: the valgus angle before and after flexion osteotomy.

β0 and β1: the flexion angle before and after flexion osteotomy.

γ0 and γ1: the angle of anteversion before and after flexion osteotomy.