Knee arthrodesis is a procedure that fuses the thigh bone to the lower leg bone at the knee. The joined bones may be secured with plates and screws. This method of support is called internal fixation. It provides support while the bones fuse together.
Your knee will no longer be able to bend after this surgery.
Reasons for Procedure
Knee arthrodesis may only be done if all other repair methods are not appropriate or have failed. It may be done:
- After a failed knee replacement
- In patients with chronic joint infections that have led to severe knee damage
- In patients with debilitating pain that cannot be resolved by other treatment options
Arthrodesis may reduce pain and improve overall function. However, it will prevent bending at the knee and will cause a limp.
Your doctor will review a list of possible complications, which may include:
- Excess bleeding
- Adverse reaction to anesthesia such as light-headedness, low blood pressure, wheezing
- Blood clots
- Loosening of components is possible in patients with poor bone quality
- Aggravation of current medical conditions
- The thigh and shin bones do not join together as expected
Factors that may increase the risk of problems include:
- Some chronic diseases, like obesity or diabetes
- Heavy alcohol use
Make sure you talk to your doctor about these risks before your procedure.
What to Expect
Prior to Procedure
Your doctor may do the following before your procedure:
- Physical exam
- Blood tests
- Imaging tests, like x-rays or scans
- Electrocardiogram for heart function
- Have you donate blood in case you need a transfusion
- Prescribe antibiotics to prevent infection
Before surgery, you will need to:
- Arrange for a ride home.
- Arrange for help at home while you recover.
- Talk to your doctor about any medications, herbs, or supplements you are taking.
- Talk to your doctor about any allergies you have.
- Ask your doctor about devices you will need after the surgery like a wheelchair, walker, or cane.
You may need to stop taking some medications up to one week before the procedure. Medications that may need to be stopped may include:
- Anti-inflammatory drugs
- Blood thinners
Do not eat or drink anything after midnight the day before your surgery, unless told otherwise by your doctor.
General anesthesia will be used. You will be asleep during the surgery.
Description of the Procedure
An incision will be made over the knee. A small amount of bone from the ends of the thigh bone and top of the lower leg bone will be removed. Other knee joint structures like cartilage and ligaments or knee replacements will be removed. The ends of the bones will be joined together, usually with a bone graft. Metal plates will be screwed into the joined bones.
The incision will be closed. A bandage may be placed over the incision.
How Long Will It Take?
About two hours
Will It Hurt?
Anesthesia will block pain during the procedure. You will have pain after the procedure. Ask your doctor about medication to help manage pain.
Average Hospital Stay
The usual length of stay is about 3-4 days. It is possible that you may have to stay longer if complications arise. You may also go to a rehabilitation hospital to help you recover.
Right after the procedure, you may be given medication such as:
- Pain medication
- Antibiotics to prevent infection
- Medication that prevents blood clots
Physical therapy often starts within 24 hours after your surgery. During this time you may need devices to help you walk.
You will be able to leave when you are able to get around and do basic daily care activities on your own.
When you return home, take these steps:
- Follow your doctor’s instructions on cleaning the incision site.
- Ask your doctor about when it is safe to shower, bathe, or soak in water.
- Follow your doctor’s instructions on sitting, bending, or sleeping positions.
- Continue with your physical therapist’s exercise program.
Call Your Doctor
Call your doctor if any of these occur:
- Signs of infection such as fever or chills
- Problems at the incision site such as redness, swelling, pain, bleeding, or draining
- Nausea or vomiting
- Pain that does not go away with the pain medicine
- Numbness or tingling in lower leg
- Chest pain or trouble breathing
If you have an emergency, call for medical help right away.