By the time the knee is removed, most patients will have lost about 80 percent of their bone mass.
But for some, the change is subtle.
Some people may experience mild to moderate knee pain after surgery, but it will improve after just a few weeks.
In some patients, the pain may only improve in the short term, as the swelling recedes.
In other patients, their pain worsens and they have to be hospitalized for weeks to heal completely.
The long-term effects of the knee pain and swelling can include:Lower back painA lower back pain, called sciatica, can be severe, causing people to miss work or school.
This can affect the mobility of the legs.
It can also make it difficult for people to walk, sit or stand.
It is often treatable, but many people require multiple surgeries.