Diagnostic Approach and Management of Ulnar Nerve Issues

Clinical Assessment

The American Society of Anesthesiologists recommends that focused preoperative physical assessment can identify patients with increased risk for perioperative peripheral neuropathies 1

Electrodiagnostic studies are helpful in supporting the diagnosis, particularly in patients with atypical presentation, according to the American Academy of Neurology 2
MRI with T2-weighted neurography is the reference standard for imaging, showing high signal intensity and nerve enlargement, as stated by the American College of Radiology 3
Ultrasound is an effective alternative with high accuracy (sensitivity 77-79%, specificity 94-98%) for assessing cross-sectional area and nerve thickness, as reported by the American Institute of Ultrasound in Medicine 3
Shear-wave elastography has shown 100% specificity and sensitivity for diagnosing ulnar neuropathy at the elbow, according to the National Institute of Neurological Disorders and Stroke 3
The classic "sural sparing pattern" in electrodiagnostic studies can help differentiate ulnar neuropathy from other conditions, as noted by the American Academy of Neurology 2

The American Academy of Orthopaedic Surgeons recommends maintaining neutral forearm position when arm is tucked at side 3
The American Academy of Orthopaedic Surgeons suggests using supinated or neutral forearm position when arm is abducted on an armboard 3
The American Academy of Orthopaedic Surgeons advises limiting arm abduction to 90° in supine position to prevent ulnar nerve entrapment 3
The American Academy of Orthopaedic Surgeons recommends avoiding prolonged pressure on the postcondylar groove of the humerus (ulnar groove) 3
Paracetamol (up to 4g/day) is recommended as first-line oral analgesic for pain management by the American Pain Society 3
Topical NSAIDs are recommended for localized pain with fewer systemic side effects by the American College of Rheumatology 3
Range of motion and strengthening exercises are recommended to maintain function by the American Physical Therapy Association 3

The American Society of Anesthesiologists recommends periodic assessment of upper extremity position during procedures to prevent complications 4
The American Academy of Orthopaedic Surgeons advises avoiding excessive elbow flexion beyond 90° as this increases risk of ulnar neuropathy 5

Regular follow-up is recommended to monitor for progression or improvement of symptoms by the American Academy of Neurology 6

The American Society of Anesthesiologists guidelines recommend applying specific padding (foam or gel pads) at the elbow to prevent further compression of the ulnar nerve, as 68% of consultants and 78% of members agree that this decreases ulnar neuropathy risk 7, 8, 9
The American Society of Anesthesiologists guidelines also note that inappropriate padding (too tight) can paradoxically increase risk, emphasizing the importance of proper application 7, 8

The American Society of Anesthesiologists guidelines warn against using padding that is too tight, which can create a tourniquet effect 7, 8