Table 4. Radial nerve injury presentations.

Location	Sensory deficits	Motor deficits	Etiology
Axilla	Structures below axilla	Structures below axilla & triceps paralysis if radial nerve is injured	Improper crutch use
Mid-arm (spiral groove)	Everything under & numbness, paresthesia, pain along lateral posterior arm†	Structures below axilla & wrist drop	Humeral fracture, Saturday night palsy, honeymoon palsy
Elbow (radial tunnel)	Pain with extension or repetitive pronation/supination	Occasional weakness of extension and supination, secondary to pain	Radial tunnel syndrome, compression within the tunnel
PIN	None	Paralysis of the finger extensors (not a true wrist drop)	Radial head fracture or chronic soft tissue compression
Superficial forearm and wrist	Radial side of the dorsum of the hand numbness (thumb, index finger, and the radial half of middle finger)	None	Cheiralgia paresthetica due tight wrist compression, repetitive supination and pronation

^†, does not occur in midshaft humerus fracture. PIN, posterior interosseous nerve.