In a 32 years old professional handball layer, the micro-traumata typical o
f this game led to retropatellar cartilage lesion, which became sympthomati
c following an distortion-impact trauma. Since the patient remaind symptoma
tic after initial conservative treatment as well as arthroscopic chondropla
stic, osteo-chondral transplantation was performed. There was a good functi
onal result 6 months after surgery.