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Ulnar Nerve Entrapment: Cubital Tunnel, Causes, Symptoms & Treatment

Tingling in the small (pinky) and ring fingers — especially with elbow flexion or nocturnal symptoms — suggests ulnar nerve compression, most commonly at the cubital tunnel (elbow).

Anatomy

Ulnar nerve (C8–T1) → medial cord → arm → posterior to medial epicondyle (cubital tunnel) → forearm (innervates FCU, FDP to D4/D5) → Guyon's canal (wrist) → hand (intrinsics, sensation to D4/D5 palmar/dorsal).

Common Compression Sites

  1. Cubital tunnel (elbow) — most common: Nerve stretches 5–8 mm with flexion; fascia thickens, subluxes, or compresses. Risk: leaning on elbows, prolonged flexion (sleep, phone), trauma, arthritis, ganglion cysts.
  2. Guyon's canal (wrist): Compression from ganglion, hook of hamate fracture, cyclist's palsy (ulnar tunnel syndrome). Spares dorsal ulnar cutaneous nerve (dorsum sensation intact).
  3. Cervical spine (C8–T1 radiculopathy): Herniated disc, foraminal stenosis. Usually bilateral or with neck/shoulder pain, reflex changes.
  4. Thoracic outlet syndrome: Lower trunk compression (scalenes, cervical rib).

Symptoms by Site

  • Cubital tunnel: Nocturnal paresthesias D4/D5; elbow pain; weakness (grip, pinch, finger abduction); Froment's sign (IP flexion of thumb on key pinch); Wartenberg's sign (abducted small finger); clawing (late).
  • Guyon's canal: Motor > sensory; thenar sparing; no dorsal sensory loss.
  • Cervical radiculopathy: Neck pain, scapular radiation, reflex changes, possible C7 (triceps, middle finger) overlap.

Diagnosis

  • Clinical: Tinel's at elbow, elbow flexion test, shoulder abduction test.
  • NCS/EMG: Localizes site, grades severity (mild/moderate/severe), rules out radiculopathy/polyneuropathy.
  • Ultrasound/MRI: Structural lesions (ganglion, mass, nerve enlargement).

Treatment

  • Conservative (mild/moderate): Night splinting (30–45° flexion), activity modification (avoid prolonged flexion/leaning), ergonomics, nerve glides, NSAIDs.
  • Surgical (moderate/severe, failed conservative >3–6 mo, motor loss):
    • In situ decompression (simple release)
    • Submuscular/subcutaneous transposition (anterior relocation)
    • Medial epicondylectomy
  • Guyon's canal: Decompression ± mass excision.

Prognosis

Early decompression → excellent sensory/motor recovery. Chronic severe compression → incomplete recovery (axonal loss). Post-op therapy optimizes outcomes.

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