What it is
Peripheral nerve decompression releases a nerve from the anatomical structure compressing it — a ligament, a tight fibrous band, a muscle, or adjacent tissue. The specific procedure depends on which nerve is involved and where it is compressed:
- Carpal tunnel release — divides the transverse carpal ligament at the wrist to decompress the median nerve. One of the most common surgical procedures performed, with high success rates and low complication risk. Can be done open (small incision at the wrist crease) or endoscopically.
- Cubital tunnel decompression or transposition — releases or repositions the ulnar nerve at the medial elbow. Options include simple in-situ decompression, medial epicondylectomy, or anterior transposition, depending on the anatomy and severity.
- Peroneal nerve decompression — releases the common peroneal nerve at the fibular head for patients with foot drop or lateral leg numbness from entrapment at that site.
- Other entrapments — meralgia paresthetica (lateral femoral cutaneous nerve), tarsal tunnel (tibial nerve), radial tunnel, and others can be approached surgically when conservative care has failed.
Confirming the diagnosis first
Electrodiagnostic studies (nerve conduction studies and EMG) are an important part of the preoperative evaluation. They localize the problem, quantify severity, and help distinguish peripheral entrapment from cervical or lumbar radiculopathy — which can look similar clinically. Operating on the wrong site is an avoidable outcome.
What to expect
Most peripheral nerve decompressions are outpatient procedures done under local or regional anesthesia with sedation. Recovery depends on the nerve and the severity of pre-existing damage — numbness and weakness from long-standing compression may recover slowly over months, and complete recovery is not guaranteed in advanced cases. Results are better when the nerve is decompressed before significant axonal loss has occurred.