Robert Hagan, M.D.

• Peripheral Nerve Surgery
• Headache & Occipital Neuralgia Surgery
• Thoracic Outlet Syndrome
• Reconstructive Microsurgery
• Hand & Extremity Surgery
• Complex Peripheral Nerve Injury

• Peripheral nerve injury and entrapment
• Post-traumatic peripheral nerve conditions
• Post-surgical nerve injury and pain
• Neuromas
• Headache and migraine associated with peripheral nerve compression
• Occipital neuralgia
• Thoracic outlet syndrome
• Neck, shoulder and upper-extremity nerve conditions
• Hand and extremity nerve injuries
• Carpal tunnel syndrome
• Cubital tunnel syndrome
• Radial tunnel syndrome
• Complex nerve compression and chronic neuropathic pain

Dr. Hagan received his medical degree from Saint Louis University School of Medicine.

He completed general surgery training at the Lahey Clinic in Boston and plastic surgery training through the Lahey Clinic and Harvard Medical School hospitals. He continued his advanced surgical education with a Harvard Medical School fellowship specializing in hand surgery and microsurgery.

After returning to St. Louis, Dr. Hagan completed an additional craniofacial fellowship at Washington University in St. Louis.

His multidisciplinary surgical training provides a broad foundation for evaluating complex peripheral nerve disorders that may cross traditional anatomical specialties.

Dr. Hagan is committed to advancing the diagnosis and treatment of peripheral nerve disorders through clinical research, education and development of surgical techniques.

He has authored or contributed to more than 70 scientific journal articles and 10 book chapters, with research addressing peripheral nerve injury, neuroma, headache surgery, occipital nerve disorders, thoracic outlet syndrome and other complex nerve conditions.

Neuropax Clinic also serves as a center for clinical research, physician education and advancement of peripheral nerve surgical techniques.

• American Society of Plastic Surgeons
• American Association for Hand Surgery
• American Society for Peripheral Nerve
• American Society for Reconstructive Microsurgery
• Association of Extremity Nerve Surgeons
• American Headache Society

Dr. Hagan’s board certification in plastic and reconstructive surgery, advanced surgical training and extensive peripheral nerve experience provide a specialized foundation for evaluating injuries and conditions involving the peripheral nervous system.

His medical-legal evaluations may include:

• Independent Medical Examinations
• Second opinions
• Medical record review
• Peripheral nerve injury and entrapment
• Post-traumatic and post-surgical nerve conditions
• Causation
• Diagnosis and treatment recommendations
• Reasonableness and necessity of treatment
• Maximum medical improvement
• Impairment and disability evaluation
• Deposition and expert testimony

• Reset Neurectomy for Cutaneous Nerve Injuries. Hagan R, Eberlin K, Pickrell B, Hamaguchi R. PRS Global Open Journal. 2021 Feb, 15th. Doi: 10.1097 
• Surgical Treatments of the Supraorbital and Supratrochlear nerves: Hagan R, Khansa I, Janis J. Chapter, Book, Surgical Treatment of Chronic Headaches and Migraines. March 2020. 
• The Greater Occipital Nerve and Obliquus Capitis Inferior Muscle: Anatomical Interactions and Implications for Occipital Pain Syndromes. Scherer SS, Schiraldi L, Sapino G, Cambiaso-Daniel J, Gualdi A, Peled ZM, Hagan R, Pietramaggiori G. PRS Journal 2019 
• Supraorbital Rim Syndrome: Definition, Surgical Treatment, and Outcomes for Frontal Headache. Hagan RR, Fallucco MA, Janis JE, PRS Journal 2016. 
• A review of current evidence in the surgical treatment of migraine headaches. JanisJE, Barker JC, Javadi C, Ducic I, Hagan R, Guyuron B. Plast Reconstr Surg. 2014 Oct;134(4 Suppl 2):131S-41S. doi: 10.1097 
• Anatomy of the supratrochlear nerve: implications for the surgical treatment of migraine headaches. JanisJE, 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. 
• Chronic daily headaches secondary to greater auricular and lesser occipital neuromas following endolymphatic shunt surgery; Vorobeichik L, Fallucco MA, Hagan RR, BMJ Case Reports 2012; doi: 1136/bcr-2012-007189. 
• The anatomical morphology of the supraorbital notch: Clinical relevance to the surgical treatment of migraine headaches; Fallucco M, Janis J, Hagan R, PRSJournal 2012. 
• Selective denervation of the corrugator supercilia muscle for the treatment of idiopathic trigeminal neuralgia purely paroxysmal         distributed in the supraorbital and supratrochlear dermatomes: Gualdi 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)
• Novel Surgical Approach for Decompression of the Scalene Triangle in Neuorgenic Thoracic Outlet Syndrome: Hagan R, Ricci J, Eberlin K,  J Reconstr Microsurg 2018;34:315-320. 
• Soleal Sling Syndrome (Proximal Tibial Nerve Compression): Results of Surgical Decompression; Williams E, Rosson G, Hagan R, Hashemi S, Dellon AL; Plastic and Reconstructive Surgery Journal, Volume 129(2). 
• 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). 
• Consensus Recommendations for Neurogenic Thoracic Outlet Syndrome from the INTOS Workgroup. Chim H, Hagan R. Plast Reconstr Surg Glob Open. 2024 Aug 28;12(8):e6107.
• Pearls for Starting a Headache Surgery Practice in Academic and Private Practice. Saad M, Connor L, Hazewinkel MHJ, Peled ZM, Hagan RR, Gfrerer L, Kassis SA. JPRAS Open. 2023 Dec 10;39:127-131.
• Anatomic Anomalies of the Nerves Treated during Headache Surgery. Peled ZM, Gfrerer L, Hagan R, Al-Kassis S, Savvides G, Austen G, Valenti A, Chinta M. Plast Reconstr Surg Glob Open. 2023 Nov 21;11(11):e5439.
• Lesser Occipital Nerve Decompression through a Single Vertical Midline Incision Reduces Reoperation Rates. Remy, Katya MD; Hazewinkel, Merel H. J. MD; DePamphilis, Matthew A. BS; Austen, William G. Jr MD; Hagan, Robert R. MD; Gfrerer, Lisa MD, PhD. Plastic and Reconstructive  Surgery 156(3):p 412e-419e, September 2025.
• Greater Occipital Nerve Cushioning with Muscle Flap versus Fat Flap Results in Lower Reoperation Rates, M.H.J. Hazewinkel, K. Remy, M. DePamphilis, G.L.E. Mönnink, J. Raschi, William G. Austen Jr., R.R. Hagan, L. Gfrerer.; Plastic and Reconstructive Journal, 2025
• Reset Neurectomy for Cutaneous Nerve Injuries. Eberlin KR, Pickrell BB, Hamaguchi R, Hagan RR. Plast Reconstr Surg Glob Open. 2021 Feb 15;9(2):e3401
• The Role of Diagnostic Nerve Blocks in the Diagnosis of Symptomatic Neuroma. Gfrerer, L., Hagan, RR. (2024). Chapter In: Contemporary Neuroma Management. Springer, Eberlin, K.R., Ducic, I., Moore, A., Cederna, P.S., Valerio, I.L., Dumanian, G.

• The Association of Long Thoracic Nerve Variants With Medial Scapular Winging in Thoracic Outlet Syndrome: A Clinical and Anatomical Study. Madi El Haj, MD, MSC, Shaul Beyth, MD, PhD, Robert R. Hagan, MD, Sofia A. Vorobeitchik, BS, Harvey Chim, MD

• Plastic and Reconstructive Surgery Advance Online Article – Greater Occipital Nerve Cushioning with Muscle versus Fat Flap results in Lower Reoperation Rates. Merel H. J. Hazewinkel1 , Katya Remy2 , Connor Mullen3 , Matthew DePamphilis2 , Giulia L. E. Mönnink1 , Jordan Raschi1 , William G. Austen Jr.2 , Robert R. Hagan3 , Lisa Gfrerer1 1. Weill Cornell Medicine, Division of Plastic and Reconstructive Surgery, New York, NY 2. Harvard Medical School, Division of Plastic Surgery, Hand Surgery, and Peripheral Nerve Surgery Boston, MA 3. Neuropax Clinic, St. Louis, Mo

• Systematic Approach to the Management of Neuropathic Groin Pain: A 20-year Retrospective Cohort Study: Kevin M. Klifto, DO, PharmD, William D. Henderson, MA, Miguel I. Dorante, MD, MBE, David L. Brown, MD & Robert R. Hagan, MD