Ulnar nerve - digital branches lesions
Causes
- Trauma
- Compression from instruments (eg “Flutist’s neuropathy”, “bowler’s thumb”)
- Nerve sheath tumors
- Tenosynovitis
- Tendon sheath cysts and tumors
- Nerve infarct (eg. vasculitis, diabetes)
- Chronic pressure
- Infections (leprosy)
- Rheumatoid disease
- Dysproteinemia
- Dupuytren’s contracture
Symptoms & signs
- Sensory deficit, pain, paresthesia in 5th and ulnar half of 4th finger.
- No motor symptoms or signs.