Nerve Entrapment
Nerve Entrapment
Many nerve entrapments can occur to due compression from a nearby anatomic structure or fibrotic scar tissue formed by trauma or repetitive injury.
Symptoms may include pain, numbness, tingling, or weakness.
EMG/nerve conduction studies are helpful in establishing a diagnosis and localizing the site of injury. Further imaging with diagnostic ultrasound can demonstrate signs of compression and swelling of the nerve.
Nerve Hydrodissection
Ultrasound-guided hydrodissection (also known as perineural injection) is a technique of injecting a volume of fluid (local anesthetic, sterile saline, +/- corticosteroid) into scars or fascia to release the entrapped nerve. Real-time imaging with ultrasound is a necessity to identify the nerve and avoid direct injury.
Reference:
Trescot A, Brown M. Peripheral nerve entrapment, hydrodissection, and neural regenerative strategies. Techniques in Regional Anesthesia and Pain Management. 2015.