The most common places they felt pain were the lower back, legs, knee joints, and feet.

And there was a great uncertainty about his knee joints.

A piece of bone may break off somewhere in the knee joint.

This may be a sign of bleeding inside the knee joint.

There are no signs of fluid in or around the knee joint.

For the moment, though, the knee joint was more a liability than an advantage.

People don't have two knee joints in each leg etc.

Pain or discomfort may also develop in the knee joints.

The float is reported to be easy on the knee joints.

The trick was to move just the knee joints and no others.