Fig. 1

Workflow of computer-assisted planning and patient-specific surgical guide design (right ankle case 2). a The 3D model of affected bone (right, yellow). b The 3D model of unaffected bone (left, blue) and the mirror model of the left normal bone (green). c The affected bone was superimposed over the mirror model of the left normal bone. d An opening wedge osteotomy was simulated. e A patient-matched plate was designed with the lengths and trajectories of every screw marked. f The final designed patient-specific guide that fits the surface of the tibia. g-h The physical model of the guide, the patient-matched plate and tibia