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Ulnar nerve entrapment at the wrist.

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    Ulnar nerve entrapment at the wrist, or Guyon canal syndrome, presents variably. Understanding anatomy and causes is key for diagnosing hand motor/sensory deficits and guiding treatment.

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    Area of Science:

    • Orthopedics
    • Neurology
    • Anatomy

    Background:

    • Ulnar nerve entrapment at the wrist, known as Guyon canal syndrome, has diverse clinical presentations.
    • Variability in presentation stems from differences in anatomy and compression site(s).

    Purpose of the Study:

    • To emphasize the importance of Guyon canal anatomy in diagnosing ulnar nerve compression.
    • To outline the various etiologies and diagnostic modalities for ulnar nerve lesions at the wrist.

    Main Methods:

    • Review of anatomical variations and common compression sites within the Guyon canal.
    • Correlation of clinical presentation with anatomical findings.
    • Discussion of diagnostic tools including history, physical examination (motor, sensory, vascular), imaging, and electrodiagnostics.

    Main Results:

    • Etiologies include soft-tissue tumors, trauma, anomalous muscles, fibrous bands, and various medical conditions.
    • Diagnosis relies on comprehensive clinical assessment and supportive studies.
    • Management strategies vary based on etiology and severity.

    Conclusions:

    • A strong understanding of Guyon canal anatomy is crucial for accurate diagnosis of ulnar nerve entrapment.
    • Nonsurgical treatment is suitable for mild, activity-related compression; persistent or worsening symptoms warrant surgical intervention.