What This Procedure Involves
Arthroscopic drilling: for stable lesions, multiple small holes are drilled through the intact cartilage into the underlying bone to stimulate a healing blood supply. Fixation: for unstable lesions, the fragment is reduced (replaced) and fixed with bioabsorbable pins, headless screws, or fibrin glue. Fragment removal and microfracture: if the fragment is non-viable, it is removed and the defect is treated with microfracture, OATS, ACI, or osteochondral allograft depending on size. The operation takes 45–90 minutes.