Common musculoskeletal (MSK) conditions of the knee and leg include osteoarthritis, ligament injuries (ACL, MCL), tendinitis, and patellofemoral pain syndrome. Physical therapy exercises help by improving knee mobility, strengthening surrounding muscles (quads, hamstrings), and restoring joint stability. These exercises reduce pain, improve flexibility, and promote better alignment, which alleviates stress on the knee joint. Strengthening the muscles around the knee also prevents further injury, enhances balance, and helps with daily movement, reducing symptoms from these common conditions.