The various clinical pictures of lower limb's mononeuropathies are described. An essential step in the diagnosis of pressure and entrapment neuropathies is to obtain an accurate description of the patient's symptoms and to ascertain whether the sensory and motor symptoms and signs correspond to the distribution of a single peripheral nerve. EMG is a useful adjunct to the physical examination and nerve conduction studies. Computer tomogram scanning may reveal bone, joint or soft tissues abnormalities responsible for the neuropathy. The attitude and the prognosis depend on the physical and functional state of damaged nerve trunks, mainly based on the classification of neuropraxia, axonotmesis and neurotmesis.