Ulnar nerve entrapment

Ulnar nerve entrapment is a condition where the ulnar nerve becomes trapped or pinched due to some physiological abnormalities.
Ulnar nerve entrapment is classified by location of entrapment. The ulnar nerve passes through several small tunnels and outlets through the medial upper extremity, and at these points the nerve is vulnerable to compression or entrapment a so called "pinched nerve". The nerve is particularly vulnerable to injury when there has been a disruption in the normal anatomy. The most common site of ulnar nerve entrapment is at the elbow, followed by the wrist.

Ulnar entrapment can also be classified by specific local causes

  • Problems originating at the neck: thoracic outlet syndrome, cervical spine pathology, tight anterior scalene muscles
  • Problems originating in the chest: tight pectoralis minor muscles
  • Brachial plexus abnormalities
  • Elbow pathology: fractures, growth plate injuries, cubital tunnel syndrome, flexorpronator aponeurosis, arcade of Struthers
  • Forearm pathology: tight flexor carpi ulnaris muscles
  • Wrist pathology: fractures, ulnar tunnel syndrome, hypothenar hammer syndrome
  • Artery aneurysms or thrombosis
  • Other: Infections, tumors, diabetes, hypothyroidism, rheumatism, and alcoholism

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