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Simulation of the 3D model knee flexion angles of 0° (a) and 45° (b); Knee internal/external rotation at 20° external (c) to 20° internal (d) rotation (0° nee flexion shown). We use the transparent CT bone model technique to estimate the tunnel vector on the bone models. As shown in Fig. 2, FTA (β) of PL tunnel was measured as the angle between the tunnel vector (green line) and femoral shaft axis (grey line) orthogonally projected into the simulated x-ray (a)
