TORONTO—There is ample evidence that jaw motor function is impaired in the acute phase after whiplash trauma. New data suggest that in the long term, after injury from whiplash, reductions in jaw amplitude and increased neck disability are persistent.
Two years after injury, jaw movement amplitudes were significantly smaller in patients who experienced whiplash (55.0 mm; IQR, 12.8 mm) than in controls (62.3 mm; IQR, 13.1 mm) (P=0.008). Furthermore, those who had whiplash trauma reported