Background and Aims:
Collision-related physical injuries are associated with negative physical and psychological sequelae which may result in long-term functional impairment and disability. 

Study aim- to determine which psychological, psychophysical and clinical pain factors can explain head and neck disability variance at 6 months post-injury. 
Methods:
53 mTBI post-MVC participants, with neck pain at baseline, participated in follow-up visit at 6m (age range 19-64, mean±SD 37 ±12, 24F). 
Head pain, neck pain, painful body areas; static and dynamic QST measures, psychological and disability-related questionnaires (NDI, Rivermead Post Concussion, PTSD) amassed. 
Initial correlation analysis performed between mean pain scores and relevant disability questionnaires. Correlation analysis also performed between disability measures and clinical, psychophysical and pain-related psychological factors.
Initial regression analysis performed separately for each group of factors (clinical, psychophysical, psychological) and disability measure. Significant factors then added to final regression model per disability measure.       
Results:
Numerous initial significant correlations found with disability measures, e.g. number of painful body areas (p<.001) and stress (p<.001). 
Final Regression Analysis found NDI variance (r=.87, p<.001) explained by neck pain (ß=.26, p=.035) and painful body areas (ß=.47, p<.001); Rivermead Head (r=.76, p<.001) by head pain (ß=.26, p=.033) and PTSD (ß=.34, p=.005); Rivermead General (r=.80, p<.001) by painful body areas (ß=.27, p=.018) and PTSD (ß=.37, p=.006). 
Conclusion:
Post-whiplash (somatic) component of collision disability explained only by clinical factors, while post-mTBI component explained by both clinical and post-traumatic factors. Additionally, whole body pain strongly contributes to both forms of disability.   
Acknowledgment:
Supported by US Department of Defense, Health Affairs Office, No. W81XWH-15-1-0603

MTBI AND WHIPLASH DISABILITY VARIANCE 6- MONTHS POST- MOTOR VEHICLE COLLISION EXPLAINED BY DIFFERENT FACTORS