Knee replacement
Knee replacement what is ?
Knee replacement surgery replaces parts of injured or worn-out knee joints. The surgery can help ease pain and make the knee work better. During the surgery, damaged bone and cartilage are replaced with parts made of metal and plastic.
To decide whether a knee replacement is right for you, a surgeon checks your knee’s range of motion, stability, and strength. X-rays help show the extent of damage.
The right artificial joints and surgical techniques for you depend on your age, weight, activity level, knee size and shape, and overall health.
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Why it’s done
The most common reason for knee replacement surgery is to ease pain caused by arthritis. People who need knee replacement surgery usually have problems walking, climbing stairs and getting up out of chairs.
If only one part of the knee is damaged, surgeons often can replace just that part. If the entire joint needs to be replaced, the ends of the thighbone and shinbone are reshaped and the entire joint resurfaced. These bones are hard tubes that contain a soft center. The ends of the artificial parts are inserted into the softer central part of the bones.
Ligaments are bands of tissue that help hold joints together. If the knee’s ligaments aren’t strong enough to hold the joint together by themselves, the surgeon may choose implants that can be connected so they can’t come apart.
Risks
Knee replacement surgery, like any surgery, carries risks. They include:
- Blood clots. Surgeons typically recommend blood-thinning medications to prevent this risk. The most common location for blood clots is in the leg. But they can travel to the lungs and become deadly.
- Nerve damage. Nerves in the area where the implant is placed can be injured. Nerve damage can cause numbness, weakness and pain.
- Infection. Infection can occur at the incision site or in the deeper tissue. Surgery is sometimes needed to treat an infection.
The implants used for knee replacements are durable, but they may loosen or become worn over time. If this happens, another surgery may be needed to replace the loose or worn parts.
Food and medications
Your health care team might advise you to stop taking certain medications and dietary supplements before your surgery. You’ll likely be instructed not to eat anything after midnight the day of your surgery.
Prepare for your recovery
For several weeks after the procedure, you might need to use crutches or a walker, so arrange for them before your surgery. Make sure you have a ride home from the hospital and help with everyday tasks, such as cooking, bathing and doing laundry.
To make your home safer and easier to navigate during recovery, consider doing the following:
- Create a living space on one floor since climbing stairs can be difficult.
- Install safety bars or a secure handrail in your shower or bath.
- Secure stairway handrails.
- Get a stable chair with a firm seat cushion and back, and a footstool to elevate your leg.
- Arrange for a toilet seat riser with arms if you have a low toilet.
- Get a stable bench or chair for your shower.
- Remove loose rugs and cords.
- Results
- For most people, knee replacement provides pain relief, improved mobility and a better quality of life. Most knee replacements can be expected to last at least 15 to 20 years.
- After recovery, you can engage in various low-impact activities, such as walking, swimming, golfing or biking. But you should avoid higher impact activities, such as jogging, and sports that involve contact or jumping. Talk to your health care team about ways to stay active after knee replacement.
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