Risks of hip and knee replacement
All surgeries have risks for complications. Knowing what these risks are and how they apply to you is part of deciding whether or not to have surgery.
You can help lower your risks from surgery by planning ahead.
- Choose a doctor and a hospital that provide high-quality care.
- Talk with your doctor long before your surgery.
- Find out what you can do to help prevent problems during and after surgery.
Risks that may occur with any surgery
- Breathing problems after surgery. These are more common if you've had general anesthesia and a breathing tube.
- Heart attack or stroke during or after surgery.
- Infection in the knee, lungs (pneumonia), or urinary tract.
- Poor wound healing. This is more likely for people who are not healthy before surgery, who smoke or have diabetes, or who take medicines that weaken their immune systems.
- An allergic reaction to medicine you receive. This is rare, but some of these reactions may be life threatening.
- Falls in the hospital. Falls can be a major problem. Things that can lead to a fall include loose hospital gowns, slippery floors, medicines that make you sleepy, pain, unfamiliar surroundings, weakness after surgery, or moving around with numerous tubes attached to your body.
It is normal to lose blood during hip or knee replacement surgery. Some people need a blood transfusion during surgery or during their recovery period in the hospital. You are less likely to need a transfusion if your red blood count is high enough before surgery.
Much of the bleeding during surgery comes from the bone that has been cut. A bruise may occur if blood collects around the new joint or under the skin after surgery.
Your chances of having a blood clot form are higher during and soon after hip or knee replacement surgery. Sitting or lying down for long periods of time during and after surgery will make your blood move more slowly through your body. This increases your risk of a blood clot.
Two types of blood clots are:
- Deep vein thrombosis (DVT). These are blood clots that may form in your leg veins after surgery.
- Pulmonary embolism. These are blood clots that may travel up to your lungs and cause serious breathing problems.
To lower your risk of blood clots, you:
- May receive blood thinners before and after surgery
- May wear compression stockings on your legs after surgery to improve blood flow
- Will be encouraged to get out of bed and walk in the halls to improve blood flow
Possible problems with your new joint
Some problems that may occur after hip or knee replacement surgery include:
- Infection in your new joint. If this occurs, your new joint may need to be removed to clear the infection. This problem is more likely in people who have diabetes or a weakened immune system. After surgery, and often before surgery, you will learn what you can do to prevent infections in your new joint.
- Dislocation of your new joint. This is rare and is usually related to activities beyond the restrictions. This can cause pain and inability to walk. You should call your doctor’s office and will likely need to go to the emergency room.
- Loosening of your new joint over time. This can cause pain, and sometimes another surgery is needed to fix the problem.
- Wear and tear of the moving parts of your new joint over time. Small pieces may break off and damage the bone. This may require another operation to replace the moving parts and repair the bone.
- An allergic reaction to the metal parts in some artificial joints. This is very rare.
Other problems from hip or knee replacement surgery can occur. Although they are rare, such problems include:
- Not enough pain relief. Joint replacement surgery relieves the pain and stiffness of arthritis for most patients. Some patients may still have some symptoms of arthritis. For most people, surgery provides enough relief.
- A longer or shorter leg. Because bone is cut away and a new knee implant is inserted, your leg with the new joint may be longer or shorter than your other leg. This difference is usually about 1/4 of an inch. It rarely causes any problems or symptoms.
Lachiewicz PF. Comparison of ACCP and AAOS guidelines for VTE prophylaxis after total hip and total knee arthroplasty. Orthopedics. 2009;32:74-78.
Mihalko WM. Arthroplasty of the knee. In: Canale ST, Beaty JH, eds. Campbell's Operative Orthopaedics. 12th ed. Philadelphia, PA: Mosby Elsevier; 2012:chap 7.
Harkess JW, Crockarell JR. Arthroplasty of the hip. In: Canale ST, Beaty JH, eds. Campbell's Operative Orthopaedics. 12th ed. Philadelphia, PA: Mosby Elsevier; 2012:chap 3.
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.