Each of them had retained a few human elements-hands, limb joints, facial composition, even hair in the form of manes and plumes-but that was all.

Bakker believed that dinosaur speed could, reasonably accurately enough, be worked out from the angle of the limb joints.

"An upright posture that keeps weight aligned with bones and limb joints greatly reduces the mechanical stresses acting on the skeleton," he said.

The worst were around their waists and major limb joints.

Cartilaginous caps are also present on all limb joints, even the smallest, and are especially thick in the shoulder, elbow and wrist joints.

The limb joints and feet are large, and the legs strong.

The basic bipedal shape was smoother than his own, nearly featureless except for limb joints.

He said, "It is as a minor ache inside a limb joint, which may come with fog, but no more important."

He craned his neck and through his good eye he saw a commotion of pistons, shining limb joints.

When the condition presents before the age of 18, it is relatively likely to cause pain and swelling of large limb joints, particularly the knee.