Radial Nerve Palsy Diagnosis and Management

Clinical Presentation and Diagnosis

The American College of Neurosurgery recommends that isolated weakness of wrist extension with preserved finger movements and no sensory loss is diagnostic of radial nerve palsy, and the primary treatment is immediate initiation of dynamic splinting combined with structured occupational therapy focused on functional task training 1
Weak wrist extension with preserved palmar flexion indicates isolated radial nerve dysfunction, as the radial nerve innervates wrist extensors while the median and ulnar nerves control wrist flexion 1
Intact finger movements rules out more proximal cervical cord pathology or combined nerve injuries 2
80% loss of wrist mobility in the extension plane confirms severe motor impairment specific to radial nerve-innervated muscles 1

The American Academy of Physical Medicine and Rehabilitation recommends providing dynamic splinting that supports wrist and finger extension through a tenodesis mechanism while avoiding static immobilization 1
Static casting or prolonged immobilization worsens symptoms, causes muscle deconditioning, promotes learned non-use, and can trigger complex regional pain syndrome 1
Functional task training with normal movement patterns as the primary therapy modality is recommended, including functional tasks promoting normal movement, progressive activity grading, and active range of motion exercises 1
A directed home exercise program is prescribed as the primary therapy modality, as evidence shows home programs are equivalent to supervised therapy for uncomplicated radial nerve palsy cases 1
Functional Electrical Stimulation (FES) should be considered for patients with demonstrated impaired muscle contraction, specifically for wrist motor impairment, as it provides short-term increases in motor strength and motor control 1

Reassess function every 2-3 weeks to evaluate splint effectiveness, adjust therapy progression, and monitor for any adverse effects from splinting 1
Use video recording interventions to demonstrate changeability in symptoms, highlight successes, and serve as reference points for replicating successful strategies 1

Never use serial casting or prolonged static immobilization as this demonstrably worsens outcomes 1
Avoid compensatory movement patterns during therapy, as these reinforce abnormal motor control and delay recovery 1
Do not delay splinting while awaiting electrodiagnostic studies, as early functional support is critical 1