Accessory flexor carpi ulnaris: a rare cause of distal ulnar nerve compression

Wang, Chen Kang; Ng, Chye Yew

doi:10.1177/1753193420943050

Cited by 6 publications

(6 citation statements)

References 4 publications

(4 reference statements)

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“…Four studies [28][29][30][31] described 5 patients (3 females, 2 males, mean age 32.8 years) experiencing UNE by an anomalous or hypertrophic FCU. All patients described weakness and numbness, while 2 cases showed a mass on the distal forearm and 3 cases had a positive Tinel sign.…”

Section: Flexor Carpi Ulnarismentioning

confidence: 99%

Uncommon Anatomical Causes of Ulnar Compression

Natroshvili,

Roorda,

van Doorn

et al. 2024

Ann Plast Surg

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Objectives Some patients develop ulnar nerve compression due to rare anatomical variations or malformations. The aims of this review are to provide a comprehensive overview of anatomical structures and variations that can cause ulnar nerve compression and to evaluate treatment options. Methods Case reports and case series about rare cases of unusual ulnar nerve compression published from January 2000 until April 2022 were obtained from databases Embase, MEDLINE, and Web of Science. A total of 48 studies describing 64 patients were included in our study. Results The following structures have proven to cause ulnar nerve compression: anconeus epitrochlearis, accessory abductor digiti minimi, vascular anomalies, palmaris longus, fibrous bands, and flexor carpi ulnaris. All cases except one have had a surgical release of the ulnar nerve resulting in diminished symptoms or complete recovery at follow-up. Conclusions In addition to considering common compression points, it is important to be aware that proximal compression symptoms, such as pain and a positive Tinel sign at the medial elbow, may be attributed to a hypertrophic AE or vascular anomaly. Distal compression symptoms encompass swelling, along with pain and a positive Tinel sign at the distal forearm. Various structures contributing to distal compression include an accessory abductor digiti minimi muscle, an accessory or anomalous palmaris longus muscle, or an accessory or hypertrophic flexor carpi ulnaris muscle. The occurrence of fibrous bands exhibits variability, manifesting in diverse locations across the arm. Level of Evidence: IV

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Section: Flexor Carpi Ulnarismentioning

confidence: 99%

Uncommon Anatomical Causes of Ulnar Compression

Natroshvili,

Roorda,

van Doorn

et al. 2024

Ann Plast Surg

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“…Unsurprisingly, accessory muscles have also been implicated in compression. Wang and Ng (2021) found the UN to potentially become entrapped at its distal end, in the area proximal to Guyon's canal. During ultrasound examination, an accessory FCU was observed beneath the normal FCU, and it was overlying the UN along its course.…”

Section: Forearmmentioning

confidence: 99%

Possible points of compression of the ulnar nerve: Tricks and traps that await clinicians from an anatomical point of view

et al. 2021

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The ulnar nerve can be subject to numerous types of compression. The most common are cubital tunnel and ulnar tunnel syndromes, but there are many others with more uncommon etiologies. The existence of additional communicating branches, median nerve involvement, various types of injuries, and unusual anatomical variations can be a challenge for both diagnosis and treatment. This review presents a comprehensive depiction of ulnar nerve entrapment syndromes with particular reference to their anatomical background, risk factors, and clinical evaluation. Even common disorders can result from atypical morphological changes. It is important to be familiar with them as it is a key ability in daily medical practice.

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“…In the first case of Wang and Ng (2021) on the intraoperative photography, it could be seen the FCUm with excessive muscular part, but without hypertrophic changes. This is not AFCUm, as the authors’ state, but a normal finding of predominant muscular belly, that I frequently observed during my anatomical dissections and surgical interventions.…”

mentioning

confidence: 94%

“…It is true that the FCUm in the presented case is over the UN, but that is a well known and normal finding. Wang and Ng (2021) mentioned an ultrasound study that demonstrated anomalous muscle, but it is not illustrated in the article. Moreover, in my opinion, it is more appropriate to use the term VM instead of anomalous muscle.…”

mentioning

confidence: 99%

Re: Wang CK, Ng CY. Accessory flexor carpi ulnaris: a rare cause of distal ulnar nerve compression. J Hand Surg Eur. 2021, 46: 197–9

Georgiev

2021

J Hand Surg Eur Vol

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Accessory flexor carpi ulnaris: a rare cause of distal ulnar nerve compression

Cited by 6 publications

References 4 publications

Uncommon Anatomical Causes of Ulnar Compression

Uncommon Anatomical Causes of Ulnar Compression

Possible points of compression of the ulnar nerve: Tricks and traps that await clinicians from an anatomical point of view

Re: Wang CK, Ng CY. Accessory flexor carpi ulnaris: a rare cause of distal ulnar nerve compression. J Hand Surg Eur. 2021, 46: 197–9

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