Accurately depicts chondromalacia of the left medial femoral condyle with arthroscopic meniscus surgery. Shows the knee joint with extensive chondromalacia of the medial femoral condyle and a tear in the posterior horn of the medial meniscus. Surgical steps: 1. Inserting arthroscopic instruments into the knee joint through two stab wounds; 2. Removing unstable meniscal fragments; and 3. Post-operative condition showing the articular and meniscal cartilage debrided back to healthy tissue.