Pridie drilling is a now defunct cartilage repair procedure that paved the way for microfracture and nanofracture.
Technique of Pridie drilling
Damaged joint surface is drilled with a fine drill, to enable stem cells to migrate from the bone marrow underneath and to cover the surface with new fibrocartilage cells. Small carbon fibre 'Gateshead' rods could also be inserted into the drill holes to act as a conduit for cell passage.
Subchondral drilling for articular cartilage repair: a systematic review of translational research. Gao L, Goebel LKH, Orth P, Cucchiarini M and Madry H. Dis Model Mech. 2018 Jun 1; 11(6): dmm034280.
Surgical interventions (microfracture, drilling, mosaicplasty, and allograft transplantation) for treating isolated cartilage defects of the knee in adults. Gracitelli GC, Moraes VY, Franciozi CES, Luzo MV and Belloti JC. Cochrane Database Syst Rev. 2016 Sep; 2016(9): CD010675.