Anterior approach to the Cervical Spine

Position

  • Place appropriately prepared patient supine on operating table with a Mayfield headrest
  • Administer IV antibiotics
  • Turn head away from side of approach, usually towards right
  • Elevate table 30°
    • decreases venous bleeding
  • Prepare skin & drape patient, exposing neck from jaw to jugular notch

Landmarks

  • Hard palate – arch of atlas
  • C2-3 – lower border of mandible
  • C3 – hyoid
  • C4-5 – thyroid cartilage
  • C6 – cricoid cartilage & carotid tubercle
  • sternocleidomastoid

Incision

  • Transverse incision at level of fusion
  • From posteriorly border of SCM to midline
    • It is possible to access up three levels via one transverse incision, but if wider access is required, less cosmetically pleasing incision can be made along anterior border of sterncleidomastoid

Internervous Plane

  • Platsyma split
    • Facial nerve proximally
  • SCM
    • Accessory spinal nerve
  • Strap muscles
    • Segmental innervation C1-3

Superficial Dissection

  • Divide fascia over platysma in line with skin incision
  • Split fibres of platysma in their line using blunt dissection
  • Locate SCM (spinal accessory nerve)
    • & divide fascia along its anterior border, retract SCM laterally
  • Retract strap muscles medially (segmental innervation)
    • Sternohyoid
    • Sternothyroid
  • Locate carotid sheath, & divide pretracheal fascia along medial aspect of sheath
    • Common carotid artery
    • Vein
    • Vagus nerve
  • Retract carotid laterally
  • Retract midline structures medially
    • trachea & oesophagus & thyroid gland
  • Dangers
    • superior & inferior thyroid arteries
      • connect the carotid sheath to midline structures
    • middle thyroid vein
    • These may be divided if required

Deep Dissection

  • Cervical vertebrae are visible covered by
    • Anterior longitudinal ligament
    • Longus colli muscle
    • sympathetic chain
    • Prevertebral fascia
  • Divide prevertebral fascia vertically, in midline down to bone
  • Reflect subperiosteally
    • prevertebral muscles & sympathetic chain & ALL
    • to expose to anterior vertebral body

Dangers

  • Nerves
    • Recurrent laryngeal nerve
      • Right
        • may cross transversely
      • Left
        • Nerve is more constant in its course
      • May be damages during deepest layer of approach
    • Sympathetic nerves & stellate ganglion
      • Horner’s syndrome
  • Vessels
    • Carotid sheath & contents
    • Vertebral artery
    • Superior & inferior thyroid arteries