Please choose the correct ending to complete the given sentence: Health: [header] How to heal knee cartilage [title] Make a doctor's appointment as soon as possible. [step] Whether minor or serious, a knee injury should always be evaluated by a doctor. Make an appointment to see your doctor as soon as possible after your injury.

Ending1: Your doctor will start to examine the knee and also run tests to make sure it is back to normal. If it isn't, your doctor may want to order additional diagnostic tests. Ending2: If they cannot accommodate you within 2-3 days after your injury or if your knee pain cannot be managed at home, go to an urgent care facility. [title] Rest your knee for up to 72 hours. Ending3: [substeps] Your doctor will examine your knee and see how it is running, breathing, and if you are taking any anti-inflammatory medications. Your doctor may also do imaging imaging (x-rays) to check for signs of arthritis or leukemia, depending on the severity of your injury. Ending4: That way, you can see what treatment options are available and consider the best healing process for the area. [substeps] Knee compression surgery is done by placing ice or another insulating layer in the compression area.

Answer format: ending1/ending2/ending3/ending4