Best Practice Case Studies-Case 152 Asset 4 Peripheral Neuropathies of the Upper Extremity

Video Transcription

Video Summary

The lecture focused on peripheral nerve neuropathies of the upper extremity, with a strong emphasis on practical diagnosis, prognosis, and treatment. Dr. Cushman began by reviewing basic nerve injury types: neuropraxia (myelin injury with good recovery), axonotmesis (axonal injury with Wallerian degeneration and slow regrowth at about an inch per month), and neurotmesis (complete transection requiring urgent surgical repair). He explained how EMG and nerve conduction studies help distinguish demyelinating from axonal injury, but also stressed their limitations: a normal EMG does not rule out nerve irritation, and central disorders like MS will not be detected.<br /><br />He then reviewed common entrapment syndromes, including carpal tunnel syndrome, cubital tunnel syndrome, Guyon’s canal, pronator syndrome, radial tunnel syndrome, radial nerve palsy, neurogenic thoracic outlet syndrome, quadrilateral space syndrome, suprascapular neuropathy, and Parsonage-Turner syndrome. For each, he discussed typical symptoms, exam clues, and how ultrasound can identify nerve enlargement, subluxation, cysts, hematoma, tumors, or other compressive lesions. He highlighted that some conditions are often missed because they mimic musculoskeletal problems such as lateral epicondylitis or rotator cuff disease.<br /><br />A major theme was the value of ultrasound as a complement to EMG, especially for dynamic assessment and guiding diagnostic or therapeutic injections. He also noted that treatment is often conservative first—splinting, activity modification, physical therapy, and targeted injections—with surgery reserved for refractory or severe cases.

Meta Tag

Edition 4th Edition

Related Case 4th Edition, Case 152

Topic Shoulder

Keywords

4th Edition

4th Edition, Case 152

Shoulder

peripheral nerve neuropathies

upper extremity

nerve injury

EMG

nerve conduction studies

carpal tunnel syndrome

cubital tunnel syndrome

ultrasound diagnosis

entrapment syndromes

conservative treatment