Hand Examination in Neurology: Recognizing Localizing Clinical Signs

Résumé

Background: The hands provide a unique window into neurological disease, often revealing subtle signs that facilitate syndromic, topographical, and etiological diagnosis. Despite their clinical importance, neurological findings detectable on hand examination are seldom reviewed in a comprehensive and anatomically organized manner.

Methods: We conducted a narrative literature review using PubMed, the Cochrane Library, and Google Scholar, complemented by classic semiology textbooks and landmark review articles. Clinical signs were selected according to their diagnostic relevance and, when available, supporting evidence regarding diagnostic accuracy. Findings were organized according to the topographic localization of the underlying lesion.

Results: The review summarizes characteristic hand findings associated with lesions involving the cerebral cortex, basal ganglia, thalamus, corticospinal tract, spinal cord, brachial plexus, peripheral nerves, and lower motor neurons, as well as selected neuromuscular and systemic disorders with characteristic hand manifestations. For each sign, we discuss its clinical presentation, neuroanatomical basis, diagnostic value, and principal differential diagnoses. Representative illustrations are included to facilitate bedside recognition of key hand postures and deformities.

Conclusions: Careful inspection and examination of the hands provide valuable diagnostic information that extends far beyond the assessment of strength and sensation. When interpreted within the context of the complete neurological examination, characteristic hand signs can improve lesion localization, narrow the differential diagnosis, and support early recognition of neurological and selected systemic disorders. This review provides a practical, anatomically based reference for clinicians performing bedside neurological assessment.