Fig. 4.

a) Fracture angle between the line of posteromedial fragment and the posterior condylar axis was approximately 15° to 20° in the axis view. b) The distance from the articular surface was approximately 3 cm to the fracture line compact area and 6 cm to the acute vertex. c) The recommended location of the posteromedial plate. The white circle represents the insertion of the semimembranosus. d) Fracture line band, ‘spur’ sign indicated the presence of a classic flexion injury, as shown by the black line. e) Specific cases of the ‘spur’ sign.