How could an engineer utilize knowledge of the skeletal system and muscular system in designing joint replacements?

the thing they have in common is that the muscle in the tongue :P is very hard like a muscle

The muscle contraction causes bones to move joints, muscles help protect bones. Bones provide attachment sites for muscles; store Ca2+ for muscle function.

they both work together 4 movement and protection of the boby

well I'm ten all i know is that for your bones just drink milk and for muscle you must keep healthy and work out

true