S44.2

Clinical Causes: Trauma from fractures or dislocations of the humerus (upper arm bone) Direct blows or impacts to the upper arm during accidents or falls Surgical injuries during procedures involving the humerus or surrounding tissues Heavy lifting or repetitive arm movements causing nerve compression Penetrating injuries from weapons or sharp objects Swelling or hematoma formation compressing the nerve after injury Prolonged pressure or constrictive bandages around the upper arm

Key Symptoms: Weakness or paralysis of wrist and finger extension Difficulty in wrist drop—an inability to extend the wrist and fingers Impaired sensation on the back of the hand and the back of the arm Pain or tenderness along the upper arm Reduced grip strength Potential numbness or tingling sensations in affected areas Muscle wasting in severe or prolonged cases

Diagnosis Path: The diagnosis of an injury to the radial nerve involves a combination of clinical evaluation and diagnostic tests. Healthcare providers typically perform a detailed physical assessment to identify motor and sensory deficits. Electromyography (EMG) and nerve conduction studies are often utilized to evaluate nerve function and pinpoint the injury location. Imaging studies, such as X-rays or MRI, may be ordered to assess for fractures or soft tissue damage that could be affecting the nerve.

Treatment Protocols: Treatment options for radial nerve injury depend on the severity and underlying cause. Non-surgical approaches include rest, immobilization, physical therapy, and pain management. In cases where nerve compression or entrapment is suspected, addressing the underlying cause may alleviate symptoms. Surgical intervention might be necessary for nerve repair or decompression in severe injuries, such as nerve transection or compression by a fracture or scar tissue. Recovery often involves a multidisciplinary approach focusing on nerve regeneration, muscle strength restoration, and functional rehabilitation. Patience is essential, as nerve healing can be gradual, sometimes taking several months.