Anatomical relations associated to the presence of the ulnar nerve paradox.

Introduction: The ulnar nerve injury is the second most common neuropathy of the upper limb. It generates sequelae such as palmar atrophy, finger deformity and characteristic clinical signs like clawed hands. However, the motor deficits do not always correspond to the patient’s clinical condition an...

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Fecha de publicación:: 2022

Institución:: Pontificia Universidad Javeriana Cali

Repositorio:: Vitela

Idioma:: spa

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Summary:	Introduction: The ulnar nerve injury is the second most common neuropathy of the upper limb. It generates sequelae such as palmar atrophy, finger deformity and characteristic clinical signs like clawed hands. However, the motor deficits do not always correspond to the patient’s clinical condition and presentations may vary, like the “ulnar nerve paradox”, which hinders understanding and identifying the injury in clinical practice by modifying the common clinical knowledge of nerve injuries. Objective: To understand the anatomical relations that could be associated with the presence of the “ulnar paradox” in ulnar nerve injuries. Materials and methods: A literature review was conducted in Scopus and Medline using controlled terminology and advanced search equations, managing to retrieve 24 articles about the ulnar nerve anatomy, anatomic variations and motor behavior of the injured hand. Results: The anatomical path of the ulnar nerve is intercepted by multiple structures that can alter its integrity and favor inflammatory states, in addition to being exposed to muscular and nervous anatomical variations such as the “Martin-Gruber anastomosis”; all these are factors that could explain the variety of presentations in hand deformities after injury of the ulnar nerve. Conclusion: The ulnar nerve paradox is a variable, multifactorial and poorly known clinical entity that requires detailed knowledge of the ulnar nerve and the predisposing anatomical factors for its identification and understanding.

Anatomical relations associated to the presence of the ulnar nerve paradox.

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