Anatomical Basis of Wrist Drop
Introduction to Wrist Drop: Definition and Clinical Significance
Wrist drop is a clinical condition resulting from radial nerve injury, leading to an inability to extend the wrist and fingers. Understanding the anatomical basis helps in effective diagnosis and treatment.
Anatomical Basis of Wrist Drop
Introduction to Wrist Drop
Wrist drop, also known as radial nerve palsy, is a clinical condition characterized by the inability to extend the wrist and fingers at the metacarpophalangeal joints.
Anatomical Overview
The radial nerve originates from the brachial plexus (C5-T1) and provides motor innervation to the extensor muscles of the forearm. Injury to this nerve at various anatomical locations can result in wrist drop.
Causes of Radial Nerve Injury
- Midshaft humeral fractures leading to nerve compression
- Prolonged external pressure on the radial nerve (e.g., crutch palsy)
- Saturday night palsy due to excessive arm compression
Clinical Presentation
Patients with wrist drop exhibit weakness in wrist and finger extension, along with sensory deficits in the dorsal aspect of the hand.
Diagnostic Approaches
Electromyography (EMG) and nerve conduction studies help assess the severity and location of radial nerve injury.
Treatment Strategies
Management depends on the underlying cause and may include physical therapy, splinting, or surgical intervention.
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