Most of the leg swelling after knee cartilage injury is caused by trauma, the treatment mainly includes physical therapy and drug therapy. 1. Physical therapy: in the acute stage after injury, the affected limb should be braked, local ice, elevate the affected limb and other treatments to reduce post-traumatic oedema, 72 hours after the injury, you can choose heat therapy, massage, red light and other physical therapy to accelerate blood circulation, which is conducive to relieving pain and local swelling. 2. medication: you can choose non-steroidal drugs such as ibuprofen, meloxicam, etc. to relieve pain symptoms, edema is obvious, you can orally diosmin tablets, horse chestnut seed extract and other drugs to reduce swelling, but also chondroitin sulfate, glucosamine and other drugs to promote cartilage repair. After the knee cartilage injury, the whole leg is swollen, it is recommended that the patient timely hospital consultation, after clarifying the cause of the disease for standardized treatment. The above drugs need to be used under the guidance of a doctor, avoid self-medication.