A Selective Dorsal Rhizotomy (SDR), also known as a Rhizotomy, Dorsal Rhizotomy, or a Selective Posterior Rhizotomy, is a term referring to a neurosurgical procedure that selectively destroys problematic nerve roots in the spinal cord. This procedure has been well-established in the literature as a surgical intervention and is used to relieve negative symptoms of neuromuscular conditions such as spastic diplegia and other forms of spastic cerebral palsy. The specific sensory nerves inducing spasticity are identified using electromyographic (EMG) stimulation and graded on a scale of 1 (mild) to 4 (severe spasticity). Abnormal nerve responses (usually graded a 3 or 4) are isolated and cut, thereby reducing symptoms of spasticity.

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