Research:
Present research centers around identification of structural changes in suboccipital musculature of patients who have chronic cervical pain. MRI techniques have been developed to study these changes. We have recently discovered a previously unreported connective tissue bridge between the rectus capitis posterior minor muscles and the spinal dura.

Be sure and visit my WebSite http://hal.bim.msu.edu to review the innovative ways that I am using visualization technology to enhance the learning experience of osteopathic medical students.

Education:
Iowa State University, Ph.D. BME, 1974
Iowa State University, Ph.D. EE, 1974
Iowa State University, MS, 1971

Title:
Professor

Appointments:
Department of Physical Medicine & Rehabilitation
College of Osteopathic Medicine
Michigan State University
East Lansing, MI

Publications:
Hach, G.D. and R.C. Hallgren, 2004. Chronic Headache Relief After Section of Suboccipital Muscle Dural Connections: A Case Report. Headache, Vol. 44, pp. 1-6.

Andary, M.T., Hallgren, R.C., Greenman, P.E., and J.J. Rechtien, 1998. Neurogenic Atrophy of Suboccipital Muscles Following a Cervical Injury: A Case Study. American Journal of Physical Medicine and Rehabilitation, Vol. 7(6), pp. 545-549.

Hallgren, R.C., Hack, G.D., and J.A. Lipton, 1997. Clinical Implications of a Cervical Myodural Bridge. The AAO Journal, Vol. 7(4), pp. 30-34.

McPartland, J., Brodeur, R., and R. Hallgren, 1997. Chronic Neck Pain, Standing Balance, and Suboccipital Muscle Atrophy -- A Pilot Study. JMPT, Vol. 20(1), pp. 24-29.

Hack, G.D., Koritzer, R.T., Robinson, W.L., Hallgren, R.C., and P.E. Greenman, 1995. Anatomical Relationship Between the Rectus Capitis Posterior Minor Muscle and the Dura Mater. Spine, Vol. 20(23), pp. 2484-2486.

Hallgren, R.C., Greenman, P.E. and J.J Rechtien, 1994. Atrophy of Suboccipital Muscles in Chronic Pain Patients: A Pilot Study. JAOA, Vol. 94(12), pp. 1032-1038.

Hallgren, R.C., Greenman, P.E. Meyer, R.C. and J.J Rechtien, 1993. MRI of Normal and Pathological Muscle of the Upper Cervical Spine. Journal of Clinical Engineering, Vol. 18(5), pp. 433-439.