Fig. 4From: Using arthroscopy combined with fluoroscopic technique for accurate location of the bone tunnel entrance in chronic ankle instability treatmentDrill the talar and calcaneal bone tunnel. The guide wire was introduced at the midpoint of the ATFL talar footprint area. There is a narrow bare area between the anterior edge of the lateral talar articular surface and the remnant of ATFL a. A 4.5 mm cannulated drill was introduced via the guide wire to create a full-thickness tunnel in the fibula while the length of the tunnel was measured b. Arthroscopic view of the talar bone tunnel c. A 4.5 mm cannulated drill was introduced via the guide wire to create a full-thickness tunnel in the calcaneus dBack to article page