DefinitionOsteotomy of the knee is surgery that involves making a cut in one of the bones in your lower leg. This can be done to relieve symptoms of arthritis.Alternative NamesProximal tibial osteotomy; Lateral closing wedge osteotomy; High tibial osteotomy; Distal femoral osteotomyDescriptionThere are two types of surgery:Tibial osteotomy is surgery done on the shin bone below the knee cap.Femoral osteotomy is surgery done on the thigh bone above the knee cap.During surgery:You will be pain-free during surgery. You may get spinal or epidural anesthesia, along with medicine to help you relax. You may also receive general anesthesia, in which you will be asleep.Your surgeon will make a 4 – 5 inch cut on the area where the osteotomy is being done.The surgeon may remove a wedge of your shinbone from underneath the healthy side of your knee. This is called a closing wedge osteotomy.The surgeon may also open a wedge on the painful side of the knee. This is called an opening wedge osteotomy.Staples, screws, or plates may be used, depending on the type of osteotomy.You may need a bone graft to fill out the wedge.In most cases, the procedure will take 1 – 1 1/2 hours.Why the Procedure Is PerformedOsteotomy of the knee is done to treat symptoms of knee arthritis. It is done when other treatments no longer offer relief.Arthritis most often affects the inside part of the knee. Most of the time, the outside part of the knee is not affected unless you have had a knee injury in the past.advertisementOsteotomy surgery works by shifting the weight away from the damaged part of your knee. For the surgery to be successful, the side of the knee where the weight is being shifted should have little or no arthritis.RisksThe risks for any anesthesia or surgery are:Allergic reactions to medicinesBreathing problemsBleedingInfectionOther risks from this surgery include:Blood clot in the legInjury to a blood vessel or nerveInfection in the knee jointKnee stiffness or a knee joint that is not well-alignedBefore the ProcedureAlways tell your doctor or nurse what drugs you are taking, even drugs, supplements, or herbs you bought without a prescription.During the 2 weeks before your surgery:You may be asked to stop taking drugs that make it harder for your blood to clot. These include aspirin, ibuprofen (Advil, Motrin), naproxen (Naprosyn, Aleve), blood thinners such as warfarin (Coumadin), and other drugs.Ask your doctor which drugs you should still take on the day of your surgery.Tell your doctor if you have been drinking a lot of alcohol — more than 1 or 2 drinks a day.If you smoke, try to stop. Ask your doctor for help. Smoking can slow down wound and bone healing.On the day of your surgery:You will usually be asked not to drink or eat anything for 6 to 12 hours before the procedure.Take the drugs your doctor told you to take with a small sip of water.Your doctor or nurse will tell you when to arrive at the hospital.After the ProcedureBy having an osteotomy, you may be able to delay the need for a knee replacement for up to 10 years, but still stay active.A tibial osteotomy may make you look “knock-kneed.” A femoral osteotomy may make you look “bow legged.”Outlook (Prognosis)Your doctor may fit you with a brace to limit how much youre able to move your knee during the recovery period. The brace may also help hold your knee in the correct position.You will need to use crutches for 6 weeks or more. At first, you may be asked to not place any weight on your knee. Ask your doctor when it will be OK to walk with weight on your leg that had the surgery. You will see a physical therapist to help you with an exercise program.Complete recovery may take several months to a year.ReferencesCrenshaw AH. Soft tissue procedures and corrective osteotomies about the knee. In: Canale ST, Beaty JH, eds. Campbells Operative Orthopaedics. 12th ed. Philadelphia, Pa: Mosby Elsevier; 2012:chap 9.Review Date:8/12/2013Reviewed By:C. Benjamin Ma, MD, Assistant Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.