Joints ankylose.    From Wordnet, Princeton University. 

If the paralysis is widely distributed, and the joints are flail-like, it is better to ankylose the ankle and mid-tarsal joints.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

"The clergy here are, it may be said, admirable, composed of good and saintly priests; but they vegetate, torpid with inaction; they neither read nor work; their joints become ankylose; they die of weariness in this provincial spot.".    From Wordnik.com.  [The Cathedral] Reference

The proper sequence consists in correcting the deformity, providing the simplest apparatus to keep the limb in good position, preventing erroneous deflection of body weight during walking, and then allowing the child to grow and develop until he has reached the age of five before considering such an operation as transplanting tendons, and the age of ten before deciding to ankylose.    From Wordnik.com.  [Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition.] Reference

N. - joining together of bones or hard parts; resulting stiffness. ankylose, v.i. (of bones) to fuse or stiffen in this way. ankyroid, ancyroid adj. - having shape of hook.    From Wordnik.com.  [xml's Blinklist.com] Reference