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Journal of Bone and Joint Surgery - British Volume, Vol 84-B, Issue 6,
807-811.
doi: 10.1302/0301-620X.84B6.12738 Copyright © 2002 by British Editorial Society of Bone and Joint Surgery Management of chronic pain in whiplash injuryE. K. Alpar, MCh Orth, FRCS Ed Orth, Consultant Trauma and Orthopaedic Surgeon; G. Onuoha, PhD, Research Fellow; V. V. Killampalli, DNB Orth, MSc Traumatology, Clinical Research Fellow; and R. Waters, FRCS (Plast), Consultant Plastic SurgeonDepartment of Trauma and Orthopaedic Surgery, University Hospital Selly Oak NHS Trust, Raddlebarn Road, Birmingham B29 6JD, UK. Correspondence should be sent to Mr E. K. Alpar at 18 Amesbury Road, Moseley, Birmingham B13 8LD, UK. We investigated the response of chronic neck and shoulder pain to decompression of the carpal tunnel in 38 patients with whiplash injury. We also determined the plasma levels of substance P (SP) and calcitonin gene-related peptide (CGRP), which are inflammatory peptides that sensitise nociceptors. Compared with normal control subjects, the mean concentrations of SP (220 v 28 ng/l; p < 0.0001) and CGRP (400 v 85 ng/l; p < 0.0005) were high in patients with chronic shoulder and neck pain before surgery. After operation their levels fell to normal. There was resolution of neurological symptoms with improvement of pain in 90% of patients. Only two of the 30 with chronic neck and shoulder pain who had been treated conservatively showed improvement when followed up at two years. In spite of having neuropathic pain arising from the median nerve, all these patients had normal electromyographic and nerve-conduction studies. Chronic pain in whiplash injury may be caused by atypical carpal tunnel syndrome and responds favourably to surgery which is indicated in patients with neck, shoulder and arm pain but not in those with mild symptoms in the hand. Previously, the presence of persistent neurological symptoms has been accepted as a sign of a poor outcome after a whiplash injury, but our study suggests that it may be possible to treat chronic pain by carpal tunnel decompression.
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