Conservative treatment: for adolescents and those with unclosed epiphyses, plaster fixation for 8 to 12 weeks, no weight bearing for 3 months, most of the treatment results are satisfactory. Surgical treatment: osteochondral injury: lesion cleaning, drilling, microfracture, bone graft and osteochondral graft, chondrocyte transplantation. I. Cartilage injury: cartilage surface cleaning. Surgical methods: 1.Planing knife to clean up the hyperplastic synovial membrane and contour the field of view. 2.Probe hook to carefully examine the extent of the lesion, thoroughly remove cartilage fragments, do not leave residue. 3, Bone bed drilling and microfracture (vertical isometric). 4, 2mm diameter, 2mm spacing, 3mm deep. 5, Loosen the tourniquet during surgery and observe the bleeding in the surgical area, if the bleeding from the bone hole is unsatisfactory, the depth of the drill should be increased to obtain more bleeding in the lesion area. 6, Also observe the joint capsule and synovial bleeding, and negative pressure drainage should be placed if necessary. If there is active bleeding, then the incision should be appropriately enlarged to find the bleeding vessels and ligated. Bone bed drilling and microfracture indications: 1. The lesion area is ≤15×15mm. 2. The cartilage outside the lesion area is basically normal. 3. Good quality of the bone bed. 4.No infectious inflammation of synovium. 5. Age below 45 years. B. Subchondral drilling through the talus. Bone grafting. IV. Osteochondral grafting.