25-year-old male suffers from pain in his left knee that shows up after carrying out a limited physical activity. The length and the importance of the pain are proportional to the intensity of the physical activity, the pain is gradual, and is linked to the movement of the knee joint. Knee MRN showed misalignment of the femur and kneecap with the patella, diffuse superficial edema of the kneecap cartilage, and signs of diffuse tendinopathy. In the expert's opinion, the patient suffers from patello-femoral knee pain due to patellar malalignment or patellar maltracking.