Figure 2. View of the right knee from the anteroexternal port. Chondral lesion in the internal femoral condyle measuring 10 × 20 mm. A: Outerbridge grade III chondral lesion; B: lesion cleared to the subchondral bone and performance of microfractures; C: placement of the type I/III collagen matrix; D: final view with complete covering of the chondral defect.