Dr. Robert Hagan, M.D.

Dr. Robert R. Hagan received his MD from Saint Louis University School of Medicine. He received his general surgery training at The Lahey Clinic in Boston, Massachusetts and his plastic surgery training at The Lahey Clinic and Harvard Medical School hospitals. He continued his education as a fellow at Harvard Medical School in Boston, Massachusetts specializing in hand and microsurgery. Upon returning to the Midwest he completed a craniofacial fellowship at Washington University in St. Louis, MO. 

Currently, Dr. Hagan maintains a private practice at Neuropax Clinic in St. Louis, MO. He has special interests in peripheral nerve surgery and hand/extremity surgery. His diverse training in plastics, hand, peripheral nerve, craniofacial, reconstructive and microsurgery has served him well to understand the many challenges of today’s pain and peripheral nerve disorders.

Peripheral nerve itself includes diabetic neuropathy, compression neuropathies (carpal tunnel, cubital tunnel, tarsal tunnel, etc.), nerve trauma, chronic joint pain, chronic groin pain, chronic migraines, and RSD/causalgia.

Dr. Hagan is committed to the research and further development of peripheral nerve surgery. Neuropax Clinic provides a multi-center platform for clinical research and advancement of surgical techniques. Dr. Hagan has many ongoing studies focused on improving the diagnosis of and treatment of peripheral nerve and pain disorders.

Dr. Hagan and Neuropax Clinic together provide fellowship training in peripheral nerve surgery to teach other surgeons their advanced diagnostic and surgical techniques. He is also a clinical instructor for the Saint Louis University, Department of Surgery, Division of Plastic Surgery.

Dr. Robert Hagan’s professional hospital appointments include Missouri Baptist Hospital and Barnes Jewish-West Country Hospital; all located in St. Louis, Missouri.  He is a member of the American Society of Plastic Surgeons(ASPS), the American Association for Hand Surgery(AAHS), American Society For Peripheral Nerve(ASPN), the American Society for Reconstructive Microsurgery(ASRM), the Association of Extremity Nerve Surgeons(AENS), the American Headache Society(AHS), and the American Diabetes Society(ADS).

Dr. David L. Brown, MD

Dr. Brown received his M.D. degree from Vanderbilt University. He completed General Surgery Residency training at the University of Cincinnati Hospitals. His Plastic Surgery Fellowship training was completed at the University of Michigan. He received additional fellowship training in Reconstructive Microsurgery  St. Vincent’s Hospital in Melbourne, Australia. 

Dr. Brown spent 26 years at the University of Michigan Medical School, where he rose to the rank of Professor in the Section of Plastic Surgery. He was honored to hold the Endowed William C. Grabb Chair.

Dr. Brown is Board Certified by the American Board of Plastic Surgery and is a Fellow of the American College of Surgeons.  

Dr. Brown joined Neuropax in February of 2024. He has a particular interest in helping people in relieving their pain due to peripheral nerve injury. He has performed all types of major reconstructive operations and has found the surgical treatment of chronic pain to be the most rewarding due to the incredible results he has seen with these innovative techniques.  His specialties include pain following mastectomy (PMPS), knee and hip replacement, shingles (PHN), hernia repair, and abdominal nerve pain (ACNES).

Dr. Brown’s hospital appointments include Missouri Baptist Hospital and Barnes Jewish-West Country Hospital in St. Louis, Missouri.

Dr. Brown has served as the President of the American Society for Peripheral Nerve (ASPN), the Board of Directors of the American Society of Plastic Surgeons (ASPS), President of the Michigan Academy of Plastic Surgeons (MAPS), and Parliamentarian of the Plastic Surgery Research Council (PSRC), and is an Oral Boards Examiner for board certification for the American Board Plastic Surgery (ABPS). In addition, he is an active member of several other national societies including the American Association of Plastic Surgeons (AAPS) and the American Society of Reconstructive Microsurgery (ASRM). Dr. Brown co-authored several editions of the well-respected textbook of plastic surgery, The Michigan Manual of Plastic Surgery. He has published over 70 scientific journal articles and 10 book chapters. He has been an invited speaker and has presented his research and clinical work around the world. He has a particular interest in the education of plastic surgeons and has received multiple honors and awards for his teaching.

Nerve Publications by Our Physicians

Neuromas and Nerve Pain in General

  1.  Reset Neurectomy for Cutaneous Nerve Injuries. Hagan R, Eberlin K, Pickrell B, Hamaguchi R. PRS Global Open Journal. 2021 Feb, 15th. Doi: 10.1097

  2. State-of-the-Art Techniques in Treating Peripheral Nerve Injury. Kubiak CA, Kung TA, Brown DL, Cederna PS, Kemp SWP: Plast Reconstr Surg 141(3): 702-710, 2018.

  1. Current State of the Surgical Treatment of Terminal Neuromas. Ives GC, Kung TA, Nghiem BT, Ursu DC, Brown DL, Cederna PS, Kemp SWP: Neurosurgery 83(3): 354-364, 2018.

  1. Principles of nerve repair and reconstruction and neuroma managementKubiak CA, Brown DLGrabb and Smith’s Plastic Surgery, Chung, Wolters Kluwer, 2019. 8th, 10, 87-96.

  1.  Dermatosensory Peripheral Nerve Interfaces: Prevention of Pain Recurrence Following Sensory Neurectomy. Hart SE, Brown DL: Hand Clin 37(3): 383-389, 2021.

  1. Unmasked Neuropathic Pain After Neurectomy: A Case Series and Review of the LiteratureGomez-Rexrode AE, Kennedy SH, Brown DLPlast Reconstr Surg Glob Open.11(8): e5221, 08/2023.

  1. Management of Neuropathic Pain with Neurectomy Combined with Dermal Sensory Regenerative Peripheral Nerve Interface (DS-RPNI)Hespe GE, Brown DLSemin Plas Surg. 

 Migraine Headaches

  1. Surgical Treatments of the Supraorbital and Supratrochlear nervesHagan R, Khansa I, Janis J. Chapter, Book, Surgical Treatment of Chronic Headaches and Migraines. March 2020.
  1. The Greater Occipital Nerve and Obliquus Capitis Inferior Muscle: Anatomical Interactions and Implications for Occipital Pain SyndromesScherer SS, Schiraldi L, Sapino G, Cambiaso-Daniel J, Gualdi A, Peled ZM, Hagan R, Pietramaggiori G. PRS Journal 2019
  1. Discussion: Efficacy of Surgical Treatment of Migraine Headaches Involving the Auriculotemporal Nerve (Site V). Brown DL: Plastic and Reconstructive Surgery 143(2): 564-565,
  1. Supraorbital Rim Syndrome: Definition, Surgical Treatment, and Outcomes for Frontal HeadacheHagan RR, Fallucco MA, Janis JE, PRS Journal 2016.
  1. A review of current evidence in the surgical treatment of migraine headachesJanisJE, Barker JC, Javadi C, Ducic I, Hagan R, Guyuron B. Plast Reconstr Surg. 2014 Oct;134(4 Suppl 2):131S-41S. doi: 10.1097
  1. Anatomy of the supratrochlear nerve: implications for the surgical treatment of migraine headachesJanisJE, Hatef DA, Hagan R, Schaub T, Liu JH, Thakar H, Bolden KM, Heller JB, Kurkjian TJ.  Plast Reconstr Surg. 2013 Apr;131(4):743-50.
  1. Chronic daily headaches secondary to greater auricular and lesser occipital neuromas following endolymphatic shunt surgery; Vorobeichik L, Fallucco MA, Hagan RRBMJ Case Reports 2012; doi: 1136/bcr-2012-007189.
  1. The anatomical morphology of the supraorbital notch: Clinical relevance to the surgical treatment of migraine headachesFallucco M, Janis J, Hagan RPRSJournal 2012.
 Trigeminal Neuralgia


16. Selective denervation of the corrugator supercilia muscle for the treatment of idiopathic trigeminal neuralgia purely paroxysmal         distributed in the supraorbital and supratrochlear dermatomesGualdi A, Camiaso-Daniel J, Gatti J, Peled Z, Hagan R, Bertossi D,    Wurzer P,     Kamolz LP, Scherer S, Pietramaggiori G. The journal of Headache and pain 22:9 (2021)

 Neck / Face / Shoulder Pain


  1. Surgical Approach to Injuries of the Cervical Plexus and Its Peripheral Nerve BranchesBrown DL, Dellon AL: Plast Reconstr Surg 141(4): 1021-1025, 2018.
 Thoracic Outlet Syndrome


 Shoulder / Upper Extremity Pain


  1. Quadrangular space syndrome associated with superficial radial sensory neuropathyBrown DL, Chung KC: Ann Plast Surg 43(2): 207-210, 1999.
  1. Acute exertional compartment syndrome of the forearm. Dhawan V, Borschel GH, Brown DLJ Trauma 64(6): 1635-1637, 2008.
 Mastectomy Pain (PMPS)


  1. Effective Treatment of Chronic Mastectomy Pain with Intercostal Sensory Neurectomy. Hart S, Agarwal S, Hamill JB, Brown DLPlastic and Reconstructive Surgery 14:5: 876-80, 2022.
Knee Pain


  1. Chronic Neuropathic Knee Pain Treated with Peripheral Nerve Operations Combined with Regenerative Peripheral Nerve Interfaces. Cinotto G, Hamill JB, Cederna PS, Kemp SWP, Brown DLPlastic and Reconstructive Surgery.
 Amputation Pain / Phantom Pain / Neuroma Pain


  1. Regenerative Peripheral Nerve Interfaces for the Treatment of Postamputation Neuroma PainWoo SL, Kung TA, Brown DL, Leonard JA, Kelly BM, Cederna PS: A Pilot Plast Reconstr Surg Glob Open 4(12): e1038, 2016.
  1. Regenerative Peripheral Nerve Interfaces for the Management of Symptomatic Hand and Digital NeuromasHooper RC, Cederna PS, Brown DL, Haase SC, Waljee JF, Egeland BM, Kelley BP, Kung TA: Plast Reconstr Surg Glob Open 8(6): e2792, 2020. 
Lower Extremity / Foot Pain


  1. Soleal Sling Syndrome (Proximal Tibial Nerve Compression): Results of Surgical DecompressionWilliams E, Rosson G, Hagan R, Hashemi S, Dellon AL; Plastic and Reconstructive Surgery Journal, Volume 129(2).
  1. Denervation of the Periosteal Origin of the Adductor Muscles in Conjunction with Adductor Fasciotomy in the Surgical Treatment of Refractory Groin Pull; Dellon AL, Williams E, Rosson G, Hashemi S, Tollestrup T, Hagan R, Peled Z, Gurtmueller G, Ebmer J; Plastic and Reconstructive Surgery Journal, Volume 28(4).
  1. Tarsal Tunnel. Lyons DA, Brown DLNeurosurgery by Example, Peripheral Nerve Volume, Selden ed; Yang and Wilson vol ed Oxford University Press, Ny, NY, 2017.
  1. Lower Extremity Contemporary Neuroma ManagementFelder JM, Ko JH, Brown DLEberlein, Ed.; Springer, 2023.
Nerve Repair


  1.  Immediate and delayed nerve repair: improved muscle mass and function with leukemia inhibitory factor. Brown DL, Bennett TM, Dowsing BJ, Hayes A, Abate M, Morrison WA: J Hand Surg Am 27(6): 1048- 55, 2002.
Laboratory Studies About Nerves


  1. Neurotization of in vivo tissue engineered contractile, vascularized, 3-dimensional skeletal muscle. Dhawan V, Huang Y-C, Dow D, Birla RK, Brown DLPlastic and Reconstructive Surgery 16 (3S): 179-80, 2005. 
  1. Short-term anti-CD40 ligand costimulatory blockade induces tolerance to peripheral nerve allografts, resulting in improved skeletal muscle. Brown DL, Bishop DK, Wood SY, Cederna PS: Plast Recon Surg 117(7): 2250-2258, 2006.
  1. Neurotization improves contractile forces of tissue- engineered skeletal muscle. Dhawan V, Lytle IF, Dow DE, Huang YC, Brown DLTissue Eng. 13(11): 2813-2821, 2007. 
  1. Anti-CD40L monoclonal antibody treatment induces long-term, tissue-specific, immunologic hyporesponsiveness to peripheral nerve allograftsMungara AK, Brown DL, Bishop DK, Wood SY, Cederna PS:  J Reconstr Microsurg 24(3): 189-195, 2008.