Nerve Damage Practice

at the forearm & hand

Loss of thumb opposition and thenar wasting

Median nerve (recurrent branch) 

“OK-sign” weakness (thumb & index DIP can’t flex)

Anterior Interosseous Nerve

Wrist flexion intact but hand deviates radially

Ulnar nerve

“ claw hand” digits 4-5

distal ulnar nerve lesion

“Hand of benediction” when making a fist 

proximal medial nerve lesion

loss of elbow extension

radial nerve

Finger extension weakness only, no sensory loss

posterior interosseous nerve

Numbness in digits 1–3, burning in palm 

median nerve

funny bone tingling

ulnar nerve

Forearm supination lost except when elbow flexed

deep branch of radial nerve

Valgus instability at elbow in a pitcher

UCL 

Weak pronation and wrist flexion 

median nerve

Wrist drop after crutch use 

radial nerve (axilla)

Loss of adduction of wrist

ulnar nerve

injury to guyon’s canal

ulnar nerve

“Saturday night palsy” after sleeping with arm over chair

radial nerve

Weak supination and loss of extension at MCP joints

posterior interosseous nerve

Midshaft humeral fracture injures

radial nerve → wrist drop