Flexor carpi radialis brevis: a rare accessory muscle presenting as an intersection syndrome of the wrist
- 86 Downloads
The flexor carpi radialis brevis (FCRB) is a rare accessory muscle of the forearm and wrist. It is typically asymptomatic, but has been discovered either incidentally during cadaveric studies or at the time of surgery in patients with distal forearm injury. Rarely, the FCRB muscle is associated with pain. We report a patient with wrist pain related to intersection between the tendon of the FCRB muscle and the tendon of the flexor carpi radialis (FCR) muscle, with an associated longitudinal split tear of the FCR tendon, documented by magnetic resonance imaging (MRI). To our knowledge, this is only the second report in the English literature of this intersection syndrome.
KeywordsFlexor carpi radialis brevis (FCRB) Accessory muscle and tendon Tendon intersection syndrome
Compliance with ethical standards
Conflict of interest
- 8.Fano M. Bulletins de la Société anatomique de Paris. 1851:375.Google Scholar
- 12.Mantovani G, Lino W, Jr., Fukushima WY, Cho AB, Aita MA. Anomalous presentation of flexor carpi radialis brevis: a report of six cases. J Hand Surg Eur Vol. 2010;35(3):234–5.Google Scholar
- 17.Kordahi AM, Sarrel KL, Shah SB, Chang EY. Flexor carpi radialis brevis: case report of a symptomatic tear. Skelet Radiol. 2018. https://doi.org/10.1007/s00256-018-2971-z.
- 18.Spinner M. Injuries to the major branches of peripheral nerves of the forearm. 2nd ed. Philadelphia: W. B. Saunders Company; 1972.Google Scholar
- 19.Tountas CP, Bergman RA. Anatomic variations of the upper extremity. New York: Churchill Livingstone; 1993.Google Scholar
- 20.Le Double AF. Traité des variations du système musculaire de l'homme. Paris: Schleicher frères; 1897.Google Scholar
- 32.Trowbridge S, Vidakovic H, Hammer N, Kieser D. A case of anomalous flexor carpi radialis brevis muscle and its clinical significance. Int J Anat Var. 2017;10(4):91–3.Google Scholar