Is ‘Cairo toe’ the first practical prosthetic?

From The Telegraph: Is ‘Cairo toe’ the first practical prosthetic?.

Academics want to test an ancient fake big toe to see if it really did help its owner to "walk like an Egyptian".

They have made a replica of the "Cairo toe", a bending leather and wood body part which they believe could be the world’s earliest practical prosthetic.

Now they are seeking volunteers who themselves lack a right big toe, to test their theory that it actively helped its original user to walk.

If proved correct, it would mean prosthetic medicine started at least 700 years earlier than previously thought. [continue, see photo]