Fig. 1From: Comparison of hamstring and quadriceps strength after anatomical versus non-anatomical anterior cruciate ligament reconstruction: a retrospective cohort studyThe measurement of femoral tunnel aperture. a The center (red point) of femoral tunnel aperture was measured by Bernard quadrant method (4 × 4 grid). b The green circle represented the standard area of anatomical femoral footprint center described by Xu et al.*. The red points within the green circle represented the anatomical femoral reconstruction, the blue points outside the green circle represented the non-anatomical femoral reconstructionBack to article page