Osteochondral Autologous Transfer System (OATS) is a surgical procedure where a plug of bone and cartilage is cored from a relatively unimportant area of knee cartilage and used to replace damage to an important area.
The plug is a core of cartilage and bone.
The plug is 'press fit' into the prepared defect, without any fibrin glue.
One-stage OATS procedure
In an Osteochondral Autologous Transfer System the plug of tissue (osteochondral graft) is taken from the patient rather than from a donor. It is a 'one-stage' procedure, where the harvesting and the grafting are performed at the same surgery.
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Knee Articular Cartilage Repair and Restoration Techniques. Richter DL, Schenck RC Jr, Wascher DC and Treme G. Sports Health. 2016 Mar; 8(2): 153–160.