development of fatty infiltrates in the neck muscles following whiplash injury: an association with pain and posttraumatic stress. PLoS One. 6:e21194. http://dx.doi.org/10.1371/journal.pone.0021194 15. Elliott JM, Sterling M, Noteboom JT, Darnell R, Galloway G, Jull G. Fatty infiltrate in the cervical extensor muscles is not a feature of chronic, insidious-onset neck pain. Clin Radiol. 2008;63:681-687. http://dx.doi.org/10.1016/j.crad.2007.11.011 16. Elliott JM, Pedler AR, Cowin G, Sterling M, McMahon K. Spinal cord metabolism and muscle water diffusion in whiplash. Spinal Cord. 2011 Mar 8. Epub ahead of print. http://dx.doi.org/10.1038/sc.2011.17 17. Flynn T, Smith B, Chou R. Appropriate use of diagnostic imaging in low back pain: a reminder that unnecessary imaging may do as much harm as good. J Orthop Sports Phys Ther. 2011;41:838-846. http://dx.doi.org/10.2519/jospt.2011.3618 18. Fritz J, Flynn TW. Autonomy in physical therapy: less is more. J Orthop Sports Phys Ther. 2005;35:696-698. http://dx.doi.org/10.2519/jospt.2005.0111 19. Fuhrmans V. A novel plan helps hospital wean itself off pricey tests. Available at: http://online.wsj.com. Accessed September 19, 2011, 2007. 20. Jarvik JG, Hollingworth W, Martin B, et al. Rapid magnetic resonance imaging vs radiographs for patients with low back pain: a randomized controlled trial. JAMA. 2003;289:2810-2818. http://dx.doi.org/10.1001/jama.289.21.2810 21. McMahon K, Cowin G, Galloway G. Magnetic resonance imaging: the underlying principles. J Orthop Sports Phys Ther. 2011;41:806-819. http://dx.doi.org/10.2519/jospt.2011.3576 22. Murphy BP, Greathouse D, Matsui I. Primary care physical therapy practice models. J Orthop Sports Phys Ther. 2005;35:699-707. http://dx.doi.org/10.2519/jospt.2005.2167 23. OLeary S, Cagnie B, Reeve A, Jull G, Elliott JM. Is there altered activity of the extensor muscles in chronic mechanical neck pain? A functional magnetic resonance imaging study. Arch Phys Med Rehabil. 2011;92:929-934. http://dx.doi.org/10.1016/j.apmr.2010.12.021 24. Patten C, Meyer RA, Fleckenstein JL. T2 mapping of muscle. Semin Musculoskelet Radiol. 2003;7:297-305. http://dx.doi.org/10.1055/s-2004-815677 25. Ross MD, Boissonnault WG. Red flags: to screen or not to screen? J Orthop Sports Phys Ther. 2010;40:682-684. http://dx.doi.org/10.2519/jospt.2010.0109 26. Ross MD, Cheeks JM. Clinical decision making associated with an undetected odontoid fracture in an older individual referred to physical therapy for the treatment of neck pain. J Orthop Sports Phys Ther. 2008;38:418-424. http://dx.doi.org/10.2519/jospt.2008.2687 27. Ross MD, Cheeks JM. Undetected hangmans fracture in a patient referred for physical therapy for the treatment of neck pain following trauma. Phys Ther. 2008;88:98-104. http://dx.doi.org/10.2522/ptj.20070033 28. Segal RL. Use of imaging to assess normal and adaptive muscle function. Phys Ther. 2007;87:704-718. http://dx.doi.org/10.2522/ptj.20060169 29. Strudwick M, Anderson S, Dimmick S, Saltzman M, Hsu W. Pearls and Pitfalls of Magnetic Resonance Imaging of the Upper Extremity. J Orthop Sports Phys Ther. 2011;41:861-872. http://dx.doi.org/10.2519/jospt.2011.3833 30. journal of orthopaedic & sports physical therapy | volume 41 | number 11 | november 2011 | 805Tall M, Thompson A, Greer B, Campbell S. The Pearls and Pitfalls of Magnetic Resonance Imaging of the Lower Extremity. J Orthop Sports Phys Ther. 2011;41:873-886. http://dx.doi.org/10.2519/jospt.2011.3713n closing, as an old legal adage states: If you have the truth on your side, pound the truth. If you have the facts on your side, pound the facts. And if you have neither, pound the table. For todays (and tomorrows) physical therapist, it is important to realize the responsibility that comes with the complex challenges of referral for