II. Causes

  1. Trapezius Trauma
  2. Shoulder Dislocation
  3. Nerve injury during surgical procedures
    1. Radical neck dissection
    2. Cervical node biopsy
    3. Carotid endarterectomy

III. Symptoms

  1. Generalized Shoulder Pain
  2. Shoulder weakness

IV. Signs

  1. Shoulder sags on affected side
  2. Shoulder weak on shrugging
  3. Forward flexion at Shoulder weak overhead
  4. Trapezius atrophy (with longstanding injury)

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