Fig. 3From: Comparison of freehand technique and a novel laser-guiding navigation system in femoral neck-cannulated screw fixation: a randomized controlled trialThe sawbone femoral neck model was firmly fixed in the blind box (A). Ensured that the distal guide pin (Φ = 2 mm) was drilled along the red and green laser lines and confirmed that the Kirschner wire passed through target chanel through fluoroscopy (B). The other two guide pins were also placed by the parallel drill guideBack to article page