Fig. 4

Measurements were performed using three-dimensional computed tomography (right knee). A Anterior view, B Axial view. PA popliteal artery, PCL posterior cruciate ligament, PS the shortest distance from the popliteal artery to the simulated trajectory needle, d the distance from the posterior cruciate ligament, A–E the insertion points 0 mm, 5 mm, 10 mm, 15 mm, or 20 mm lateral to the edge of the patellar tendon, respectively