Published online by Cambridge University Press: 22 August 2009
Introduction
Spasticity is one of the commonest sequelae of neurological diseases. In most patients spasticity is useful in compensating for lost motor strength. Nevertheless, in a significant number of patients it may become excessive and harmful, leading to further functional losses. When not controllable by physical therapy, medications and/or botulinum toxin injections, spasticity can benefit from neurostimulation, intrathecal pharmacotherapy or selective ablative procedures.
Neuro-stimulation procedures
Stimulation of the spinal cord was developed in the 1970s on the basis of the ‘gate-control theory’ of Melzach and Wall (1974) for the treatment of neurogenic pain. This method has been found to be partially effective in the treatment of spastic syndromes, such as those encountered in multiple sclerosis (Cook & Weinstein, 1973; Gybels & Van Roost, 1987) or spinal cord degenerative diseases, such as Strumpell–Lorrain syndrome. However, this method is generally most effective when spasticity is mild and the dorsal column has sufficient functional fibres, as assessed by somatosensory evoked potentials. Stimulation electrodes are implanted, either percutaneously through a Tuohy needle under X-ray fluoroscopy or surgically via an open interlaminar approach in the extradural space posteriorly to the dorsal column, at the level of the thoracolumbar spinal cord for spasticity in the lower limbs of paraparetic patients or at the level of the cervical spinal cord for spasticity in the upper and/or lower limbs of quadriparetic patients.
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