Diagnosis and Management of Forearm Pain with Pronation/Supination

Primary Diagnosis and Clinical Features

The American Society of Anesthesiologists recommends considering ulnar neuropathy as the most likely diagnosis when patients experience forearm pain with pronation/supination due to steady positioning, particularly when the forearm is maintained in a pronated position, with symptoms such as pain along the medial forearm and elbow, paresthesias in the ring and small fingers, weakness of grip strength, and tenderness over the postcondylar groove 1, 2
Ulnar nerve entrapment at the elbow is most common when the forearm is pronated or when direct pressure is applied to the ulnar groove, with a high likelihood of symptoms being reproduced by elbow flexion beyond 90° 1, 3
Radial nerve compression occurs from prolonged pressure on the spiral groove of the humerus, resulting in weakness of wrist and finger extension and tenderness over the spiral groove 1, 4

Initial imaging should start with plain radiographs to exclude osseous abnormalities, fractures, or arthritis, according to the American College of Radiology 5
Confirmatory testing includes electrodiagnostic studies (nerve conduction studies and EMG) to confirm diagnosis, localize compression site, differentiate demyelinating from axonal injury, and establish baseline severity, as recommended by the American Association of Neuromuscular and Electrodiagnostic Medicine 3, 5
Conservative management includes positioning modifications such as maintaining neutral forearm position when arm is at side, using supinated or neutral forearm position when arm is abducted, and avoiding elbow flexion beyond 90°, as suggested by the American Academy of Physical Medicine and Rehabilitation 1, 3
Pain management options include paracetamol up to 4g daily as first-line oral analgesic, topical NSAIDs for localized pain, and oral NSAIDs at lowest effective dose for shortest duration only if paracetamol is inadequate, according to the American Pain Society 3, 5

Repeat electrodiagnostic studies if symptoms worsen to assess progression from demyelinating to axonal injury, as recommended by the American Association of Neuromuscular and Electrodiagnostic Medicine 5
Follow-up monitoring strategies should be determined by location and severity of the lesion, according to the American Academy of Physical Medicine and Rehabilitation 3

Do not overlook radial nerve compression, as prolonged pressure on the spiral groove can occur simultaneously with ulnar neuropathy, as warned by the American Society of Anesthesiologists 1, 4
Do not delay electrodiagnostic studies, as these differentiate between demyelinating and axonal injury, which affects prognosis and treatment planning, according to the American Association of Neuromuscular and Electrodiagnostic Medicine 3, 5