Accessory muscle coursing from medial humeral epicondyle to medial olecranon, which may cause ulnar nerve compression
a.k.a. accessory anconeus
Arcuate ligament = retinaculum over cubital tunnel
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
Eng HY et al: Quantitative magnetic resonance imaging analysis of the cross-sectional areas of the anconeus epitrochlearis muscle, cubital tunnel, and ulnar nerve with the elbow in extension in patients with and without ulnar neuropathy. J Shoulder Elbow Surg. 27(7):1306-10, 2018
De Maeseneer M et al: Ultrasound of the elbow with emphasis on detailed assessment of ligaments, tendons, and nerves. Eur J Radiol. 84(4):671-81, 2015
Morgenstein A et al: Anconeus epitrochlearis muscle causing dynamic cubital tunnel syndrome: a case series. J Hand Surg Eur Vol. 41(2):227-9, 2014
Nellans K et al: Ulnar neuropathy as a result of anconeus epitrochlearis. Orthopedics. 37(8):e743-5, 2014
Li X et al: Anconeus epitrochlearis as a source of medial elbow pain in baseball pitchers. Orthopedics. 35(7):e1129-32, 2012
Tiong WH et al: Ulnar nerve entrapment by anconeus epitrochlearis ligament. Hand Surg. 17(1):83-4, 2012
Husarik DB et al: Elbow nerves: MR findings in 60 asymptomatic subjects--normal anatomy, variants, and pitfalls. Radiology. 252(1):148-56, 2009
Jeon IH et al: MR imaging of edematous anconeus epitrochlearis: another cause of medial elbow pain? Skeletal Radiol. 34(2):103-7, 2005
Okamoto M et al: Diagnostic ultrasonography of the ulnar nerve in cubital tunnel syndrome. J Hand Surg [Br]. 25(5):499-502, 2000
Masear VR et al: Ulnar compression neuropathy secondary to the anconeus epitrochlearis muscle. J Hand Surg Am. 13(5):720-4, 1988
Dahners LE et al: Anconeus epitrochlearis, a rare cause of cubital tunnel syndrome: a case report. J Hand Surg Am. 9(4):579-80, 1984
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KEY FACTS
Terminology
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TERMINOLOGY
Definitions
Accessory muscle coursing from medial humeral epicondyle to medial olecranon, which may cause ulnar nerve compression
a.k.a. accessory anconeus
Arcuate ligament = retinaculum over cubital tunnel
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
Eng HY et al: Quantitative magnetic resonance imaging analysis of the cross-sectional areas of the anconeus epitrochlearis muscle, cubital tunnel, and ulnar nerve with the elbow in extension in patients with and without ulnar neuropathy. J Shoulder Elbow Surg. 27(7):1306-10, 2018
De Maeseneer M et al: Ultrasound of the elbow with emphasis on detailed assessment of ligaments, tendons, and nerves. Eur J Radiol. 84(4):671-81, 2015
Morgenstein A et al: Anconeus epitrochlearis muscle causing dynamic cubital tunnel syndrome: a case series. J Hand Surg Eur Vol. 41(2):227-9, 2014
Nellans K et al: Ulnar neuropathy as a result of anconeus epitrochlearis. Orthopedics. 37(8):e743-5, 2014
Li X et al: Anconeus epitrochlearis as a source of medial elbow pain in baseball pitchers. Orthopedics. 35(7):e1129-32, 2012
Tiong WH et al: Ulnar nerve entrapment by anconeus epitrochlearis ligament. Hand Surg. 17(1):83-4, 2012
Husarik DB et al: Elbow nerves: MR findings in 60 asymptomatic subjects--normal anatomy, variants, and pitfalls. Radiology. 252(1):148-56, 2009
Jeon IH et al: MR imaging of edematous anconeus epitrochlearis: another cause of medial elbow pain? Skeletal Radiol. 34(2):103-7, 2005
Okamoto M et al: Diagnostic ultrasonography of the ulnar nerve in cubital tunnel syndrome. J Hand Surg [Br]. 25(5):499-502, 2000
Masear VR et al: Ulnar compression neuropathy secondary to the anconeus epitrochlearis muscle. J Hand Surg Am. 13(5):720-4, 1988
Dahners LE et al: Anconeus epitrochlearis, a rare cause of cubital tunnel syndrome: a case report. J Hand Surg Am. 9(4):579-80, 1984
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