A patient can extend his wrist6 but cannot extend Metacarpophalyngeal joint of hand after he has met with an accident. Sensations in the limb are normal. Level at WhiCh the affected nerve is injured
Normal sensation band normal wrist extension with inability to extend MCP joints suggest the diagnosis of PIN injury Most common of injury is around radial head and neck Refer Apleys 9th/e p 282
At coracobrachialis
Head of radius
Spiral groove
Surgical neck of humerus.
Peripheral nerve injuries