The knee is the largest joint in the body.
The femur (thigh bone) is the longest and strongest bone in our body.
There are twice as many knee surgeries performed in the United States than in England or Canada.
About one percent of people in America will need a total hip replacement or total knee replacement. More women need these surgeries than men.
At birth we have 300 bones, but some of the bones start to fuse together, so that as an adult we only have 206 bones.
The human body has 230 moveable joints.
Human bones are as strong as steel but 50 times lighter.
Bones make up only 14 percent of our weight.
The human skeleton renews every three months.
Knee joint before and after total knee replacement for arthritis: