



For the treatment of chronic WAD, there is evidence to suggest that exercise programs are effective in relieving whiplash-related pain, at least over the short term. Twenty-two studies that met the inclusion criteria were identified, 12 of which were randomized controlled trials with 'good' overall methodological quality (median Physiotherapy Evidence Database score of 6). The present article, the fourth in a five-part series, evaluates the evidence for noninvasive interventions initiated during the chronic phase of WAD. Multiple databases (including Web of Science, EMBASE and PubMed) were searched to identify all studies published from January 1980 through March 2009 that evaluated the effectiveness of any clearly defined treatment for acute (less than two weeks), subacute (two to 12 weeks) or chronic (longer than 12 weeks) WAD. A systematic review was conducted to evaluate the strength of evidence for various WAD therapies. While many treatments have been advocated for patients with WAD, scientific evidence supporting their effectiveness is often lacking. Whiplash-associated disorder (WAD) represents a significant public health problem, resulting in substantial social and economic costs throughout the industrialized world.
