Fig. 1

A 25-year-old active male patient with patellar maltracking and patellofemoral pain syndrome, who has received 4 knee procedures before the final cartilage repair. The patient reported pain and swelling because of a large grade IV chondral injury of the patella. a After a medial parapatellar arthrotomy, the patella was exposed and the cartilage defect identified. b The cartilage defect was prepared and microfractures have been performed. c The Chondro-Gide® scaffold containing BM-MSCs differentiated to chondrocytes was sutured with n.6.0 non-absorbable suture.