Fig. 1

The schematic diagram of pin-hook fixation of posterior cruciate ligament avulsion fractures. A The exposure of PCL avulsion fracture fragments; B The reduction and temporary fixation of PCL avulsion fracture fragments; C Paving the path for the pin-hook(the diameter of the drilling K-wire is 0.5 mm larger than that of the pin-hook); D The production process of pin-hook system; E The fixation of posterior cruciate ligament avulsion fractures using pin-hook system