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Starting a few days after surgery, elevate the leg with the ACL injury above the level of your heart. Elevation will help reduce your swelling. Using pillows to elevate your leg is fine, but don't put the pillows directly under your knee; this can limit your range of motion. For the first few days or weeks after surgery, you may find that you need crutches in order to move around effectively. Don't push yourself too hard: use the crutches if you need them. Once your dressing is removed, you can shower, but do not immerse your knee until your doctor says it's okay to do so. Depending on your schedule and the kind of job you have, your time away from work or school will vary. In general, someone with a desk job may need only a couple of weeks off; people with more strenuous jobs will need months. Talk to your doctor about your specific circumstances, and make a plan. After surgery, you will likely have physical therapy (see below). For the first few months after surgery, do not do strenuous activity outside of this physical therapy. As always, check with your doctor about your particular circumstances and how much activity you can allow yourself. In general, you should not drive until you are no longer taking pain medication and no longer relying on crutches to get around. You should also have good control of your knee. Typically, this takes at least a week or two.

Summary:
Elevate your leg. Use crutches. Stick to showering. Discuss your return to work or school with your doctor. Avoid strenuous activity outside of physical therapy. Use caution when beginning to drive again.