Some articles on monomelic:

Monomelic Amyotrophy - Further Reading
... "Benign monomelic amyotrophy of lower limb A rare entity with a characteristic muscular CT" ... "Benign monomelic amyotrophies of upper and lower limb are not associated to deletions of survival motor neuron gene" ... "Benign Monomelic Amyotrophy of the Lower Limb – Case Report and Brief Review of the Literature" ...