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Table 3 Unexpected angulation of a mechanical axis of the lower extremity after femoral derotation osteotomy

From: Unexpected angular or rotational deformity after corrective osteotomy

Osteotomy site   External rotation of distal fragment
   10° 20° 30° 40° 50° 60°
Intertrochanter 3D angle 1.6 3.1 4.7 6.2 7.6 7.6
Varus 1.4 2.8 4.4 6.0 7.5 7.5
Extension 0.8 1.3 1.6 1.6 1.3 1.3
  1. 3D angle: angle between the mechanical axes before and after derotation.