Influence of a previous neck sprain on recovery after whiplash injury.

The impact of a previous neck sprain on recovery from whiplash injury is unknown as published studies have produced conflicting results. This article reviews the literature on the prognosis of a second whiplash injury, distinguishing between previous injuries with and without complete recovery. The best available evidence suggests that a previous injury with incomplete recovery represents an adverse prognostic indicator. However, where there has been complete recovery, the prior injury does not influence the prognosis.