Complications Progressive contractures. Deafferentation pain; this occurs when the nerve roots are avulsed in preganglionic lesions. The cells in the dorsal column are robbed of their nerve supply. After the injury (days to weeks), spontaneous signals are generated by these cells, which result in intractable pain for the patient. Bony deformities. Scoliosis. Posterior shoulder dislocation. Agnosia of the affected limb.