All patients included in the clinical trial will receive an intramuscular infusion of autologous mononuclear cells (MNC) of Bone Marrow (BM) in TA muscle of one of the lower limb (experimental group). The lower limb on the CMN infuse autologous BM will be determined randomly.

The average dose is 550 millions of cells (100-1200 million) diluted in 2 ml. saline

All patients included in the clinical trial will receive an intramuscular infusion of 2 mL of saline (placebo) in the TA muscle of the contralateral limb (group control).

The cells are infused into the TA muscle of the lower limb randomized as Group A (experimental) intramuscularly. The infusion is made with a needle, 26 gauge, at 4 points of the TA muscle a specific depth given by the neurophysiological study. The total volume infused will be 2 ml, 0.5 ml at each point.

For infusion is as painless as possible for the patient to comply exactly with stereotactic indications of neurophysiology, the infusion was made at a uniform controlled rate and for this, the syringe is placed on a Yesargil arm, equipped with a microinjector and controlled infusion device.

Several techniques for estimating the MUNE, all based on the relationship between the amplitude or area of compound muscle action potential (CMAP) and amplitude or area corresponding to a single motor unit response. The differences between the techniques are due to the different ways of estimating the amplitude of the responses for individual motor units. The study will use two techniques:

Incremental Technique: The unitary amplitude (or area) of individual motor units are calculated from the responses to increasing intensities stimuli near of intensity threshold (Dantes and McComas, 1991) Statistical technique: The unit amplitude (or area) of the individual motor units are calculated from the amplitude variations (or area) of the muscle action potential obtained in response to stimuli from a fixed intensity (Daube, 2006)