A case of sudden, complete sciatic nerve paralysis from sitting on a hard surface was followed up nine months to complete recovery. Complete laboratory data were obtained. The cause was probably direct pressure on the nerve.
Deverell WF, Ferguson JH. An Unusual Case of Sciatic Nerve Paralysis. JAMA. 1968;205(10):699–700. doi:10.1001/jama.1968.03140360059019