Knee surgery can be a stressful time. Your knee is already in pain, and surgery will add to that for a couple of weeks. To ensure that you heal correctly and won't need surgery again, it may be a good idea to purchase a knee brace or immobilizer before the surgery. These hold the knee steady so that you don't accidentally move the knee into a compromising position and re-injure a repaired knee.
Shop-Orthopedics carries all kinds of immobilizers, cooling therapy units, and compressive sleeves/wraps to help you recover more quickly from a surgery, with the least amount of pain possible.