Knee replacement surgery replaces parts of injured or worn-out knee joints. This also is known as knee arthroplasty. During the surgery, damaged bone and cartilage are replaced with parts made of metal and plastic.
Knee replacement surgery can help ease pain and make the knee work better. 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 needed depend on many factors including age, weight, activity level, knee size and shape, and overall health.

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