A surgical procedure where small holes are drilled through damaged joint cartilage into the bone marrow of the underlying bone.

Subchondral drilling allows the formation of bloot clot into which can migrate bone marrow cells which have the potential to form a protective 'fibrocartilage' layer over the defect.

Because the high speed drill can cause heating of the bone, and consequent damage, the procedure has largely been replaced with less damaging techniques such as microfracture.

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