Physical Medicine and Rehabilitation for Morton Neuroma Clinical Presentation

  • Author: Kevin Berry, MD; Chief Editor: Consuelo T Lorenzo, MD   more...
 
Updated: Mar 30, 2010
 

History

Obtaining an accurate history is important to making the diagnosis of Morton's neuroma. Possible reported findings provided by the patient with Morton's neuroma include the following:

  • The most common presenting complaints include pain and dysesthesias in the forefoot and corresponding toes adjacent to the neuroma.
  • Pain is described as sharp and burning, and it may be associated with cramping.
  • Numbness often is observed in the toes adjacent to the neuroma and seems to occur along with episodes of pain.
  • Pain typically is intermittent, as episodes often occur for minutes to hours at a time and have long intervals (ie, weeks to months) between a single or small group of multiple attacks.
  • Some patients describe the sensation as "walking on a marble."
  • Massage of the affected area offers significant relief.
  • Narrow tight high-heeled shoes aggravate the symptoms.
  • Night pain is reported but is rare.
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Physical

Many sources acknowledge that the examination of patients with Morton's neuroma frequently is negative. Most often, sensation is wholly intact and maneuvers are unsuccessful in reproducing the characteristic pain. Palpation of the actual neuroma seldom is successful. Most clinicians focus on the history and on the lack of additional findings that might suggest other disorders.

  • Firm squeezing of the metatarsal heads with one hand while applying direct pressure to the dorsal and plantar interspace with the other hand may elicit radiating neuropathic pain. Pain localized only to the plantar aspect of the webspace also may be consistent with Morton's neuroma.
  • The squeeze test may also result in a "click" (Mulder click) as the neuroma moves between the metatarsals in the dorsal direction.[4]
  • Passive and active toe dorsiflexion may aggravate symptoms.
  • Sensory abnormalities may be observed, although motor deficits are not consistent with an interdigital neuroma because these are sensory nerves exclusively. Weakness would raise concerns for another diagnosis.
  • Careful palpation of the metatarsal heads and shafts may help to differentiate stress fractures or metatarsal head osteonecrosis from Morton's neuroma.
  • Palpation of the tarsometatarsal joint and metatarsophalangeal (MTP) joints may reveal tenderness, indicating midfoot arthritis or metatarsalgia (eg, when the tenderness is primarily on the plantar surface only) or MTP synovitis (eg, when the joint is tender with palpation).
  • Pain from MTP synovitis is aggravated with forced toe flexion. Subtle joint swelling also may coexist with MTP synovitis. Tenderness localized to the second MTP joint, along with swelling and warmth, may be, in rare cases, an early presentation of Freiburg osteochondrosis.
  • Inspection of the foot and evaluation of foot and ankle mechanics should be performed as part of the physical examination, looking for callus formation, hallux valgus, first-ray flexibility, hyperpronation, integrity of the medial arch, and gastrocnemius-soleus flexibility.
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Causes

Various factors have been implicated in the precipitation of Morton's neuroma.

  • Morton's neuroma is known to develop as a result of chronic nerve stress and irritation, particularly with excessive toe dorsiflexion.
  • Poorly fitting and constricting shoes (ie, small toe box) or shoes with heel lifts often contribute to Morton's neuroma. Women who wear high-heeled shoes for a number of years or men who are required to wear constrictive shoe gear are at risk.
  • A biomechanical theory of causation involves the mechanics of the foot and ankle. For instance, individuals with tight gastrocnemius-soleus muscles or who excessively pronate the foot may compensate by dorsiflexion of the metatarsals subsequently irritating of the interdigital nerve.
  • Certain activities carry increased risk of excessive toe dorsiflexion, such as prolonged walking, running, squatting, and demi-pointe position in ballet.[4]

See the History and Pathophysiology sections.

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Contributor Information and Disclosures
Author

Kevin Berry, MD  Resident Physician, Physical Medicine and Rehabilitation Department, University of Colorado Hospital

Kevin Berry, MD is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, American Medical Association, American Medical Student Association/Foundation, and Illinois State Medical Society

Disclosure: Nothing to disclose.

Coauthor(s)

Peter Gonzalez, MD  Assistant Professor, Department of Physical Medicine and Rehabilitation, University of Colorado School of Medicine

Peter Gonzalez, MD is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, American Association of Neuromuscular and Electrodiagnostic Medicine, American College of Sports Medicine, and Physiatric Association of Spine, Sports and Occupational Rehabilitation

Disclosure: Nothing to disclose.

Richard G Bowman II, MD  Rehabilitation and Electrodiagnostic Director, Physical Medicine and Rehabilitation, Pain Management, The Center for Pain Relief

Richard G Bowman II, MD is a member of the following medical societies: American Medical Association

Disclosure: Nothing to disclose.

Specialty Editor Board

Robert J Kaplan, MD  James E Van Zandt VA Medical Center, Staff Physician, Department of Rehabilitation Medicine

Robert J Kaplan, MD is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, Association of Academic Physiatrists, and Physiatric Association of Spine, Sports and Occupational Rehabilitation

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD  Senior Pharmacy Editor, eMedicine

Disclosure: eMedicine Salary Employment

Michael T Andary, MD, MS  Professor, Residency Program Director, Department of Physical Medicine and Rehabilitation, Michigan State University College of Osteopathic Medicine

Michael T Andary, MD, MS is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation, American Association of Neuromuscular and Electrodiagnostic Medicine, American Medical Association, and Association of Academic Physiatrists

Disclosure: allergan Honoraria Speaking and teaching; Pfizer Honoraria Speaking and teaching

Kelly L Allen, MD  Medical Director, Medevals

Disclosure: Nothing to disclose.

Chief Editor

Consuelo T Lorenzo, MD  Consulting Staff, Department of Physical Medicine and Rehabilitation, Alegent Health, Immanuel Rehabilitation Center

Consuelo T Lorenzo, MD is a member of the following medical societies: American Academy of Physical Medicine and Rehabilitation

Disclosure: Nothing to disclose.

References

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  2. Fridman R, Cain JD, Weil L Jr. Extracorporeal shockwave therapy for interdigital neuroma: a randomized, placebo-controlled, double-blind trial. J Am Podiatr Med Assoc. May-Jun 2009;99(3):191-3. [Medline].

  3. Kim JY, Choi JH, Park J, et al. An anatomical study of Morton's interdigital neuroma: the relationship between the occurring site and the deep transverse metatarsal ligament (DTML). Foot Ankle Int. Sep 2007;28(9):1007-10. [Medline].

  4. O'Connor FG, Wilder RP, Nirschl R. Foot Injuries in the Runner. In:Textbook of Running Medicine. New York: McGraw-Hill; 2001;258-260.

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  8. Monacelli G, Cascioli I, Prezzemolo G, Spagnoli A, Irace S. [Surgical treatment of Morton's neuroma: our experience and literature review]. Clin Ter. May-Jun 2008;159(3):165-7. [Medline].

  9. Valente M, Crucil M, Alecci V. Operative treatment of interdigital Morton's neuroma. Chir Organi Mov. May 2008;92(1):39-43. [Medline].

  10. Lee KT, Lee YK, Young KW, et al. Results of operative treatment of double Morton's neuroma in the same foot. J Orthop Sci. Sep 2009;14(5):574-8. [Medline].

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  13. Pace A, Scammell B, Dhar S. The outcome of Morton's neurectomy in the treatment of metatarsalgia. Int Orthop. Apr 2010;34(4):511-5. [Medline].

  14. Rout R, Tedd H, Lloyd R, et al. Morton's neuroma: diagnostic accuracy, effect on treatment time and costs of direct referral to ultrasound by primary care physicians. Qual Prim Care. 2009;17(4):277-82. [Medline].

  15. Markovic M, Crichton K, Read JW, et al. Effectiveness of ultrasound-guided corticosteroid injection in the treatment of Morton's neuroma. Foot Ankle Int. May 2008;29(5):483-7. [Medline].

  16. Betts LO. Morton's Metatarsalgia. Med J Aust. 1940;1:514.

  17. Clanton TO, Butler JE, Eggert A. Injuries to the metatarsophalangeal joints in athletes. Foot Ankle. Dec 1986;7(3):162-76. [Medline].

  18. Cyriax J. Diagnosis of soft tissue lesions.In: Textbook of Orthopaedic Medicine. 8th ed. Philadelphia, Pa:. The Curtis Center;1982.

  19. Guiloff RJ. Carbamazepine in Morton's neuralgia. Br Med J. Oct 13 1979;2(6195):904. [Medline].

  20. Jahss MH, Kummer F. Non-inflammatory synovitis of the second metatarsophalangeal joint and its surgical management. Paper read at: 16th Annual Meeting of American Orthopaedic Foot Ankle Society, New Orleans, La. February 1986.

  21. Logan PM, Janzen DL, O'Connell JX, et al. Magnetic resonance imaging and histopathologic appearances of benign soft-tissue masses of the foot. Can Assoc Radiol J. Feb 1996;47(1):36-43. [Medline].

  22. Mizel MS, Miller RA, Scioli MW. Orthopaedic knowledge update. In: Foot and Ankle. Rosemont, Ill:. American Academy of Orthopaedic Surgeons;1998.

  23. Snyder RK. In: Essentials of Musculoskeletal Care. Rosemont, Ill:. American Academy of Orthopedic Surgeons;1997.

  24. Terk MR, Kwong PK, Suthar M, et al. Morton neuroma: evaluation with MR imaging performed with contrast enhancement and fat suppression. Radiology. Oct 1993;189(1):239-41. [Medline].

  25. Vazquez-Abad D, Tian L, Monteon V, et al. CRI-EM is a human idiotype highly specific for scleroderma. Ann N Y Acad Sci. Apr 5 1997;815:512-5. [Medline].

  26. Wu KK. Morton neuroma and metatarsalgia. Curr Opin Rheumatol. Mar 2000;12(2):131-42. [Medline].

  27. Yocum LA. In: Clinics in Sports Medicine. Vol 7. Philadelphia, Pa:. WB Saunders Co;1988.

 
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Plantar view showing the relationships between the metatarsal heads, the intermetatarsal ligament, and the neuroma.
Neurectomy: typical incision location.
Neurectomy: superficial exposure.
Neurectomy: deeper dissection.
Neuroma and adherent fibrofatty tissue.
 
 
 
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