Updated: 10/5/2016

King Classification of AIS

Topic
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Type I


 

DESCRIPTION
• S shaped or double curve in which both the thoracic and lumbar curve cross the midline
Lumbar curve larger and stiffer than the thoracic curve

TREATMENT
• this type of curve is usually fuse down to L4 (via a posterior approach) or down to L3 (anterior approach)

Type II

DESCRIPTION
• S shaped or double curve in which both the thoracic and lumbar curve cross the midline
Thoracic curve larger and stiffer than the lumbar curves.

TREATMENT
• often a thoracic fusion will suffice for these patients (or down to L1)

 

Type III

DESCRIPTION
• Thoracic curve crosses midline and lumbar curve does not cross midline

TREATMENT
• thoracic fusion

Type IV

DESCRIPTION
• Long thoracic curve in which L5 is centered over sacrum but L4 tilts into long thoracic curve

TREATMENT
• fuse thru L4

Type V

DESCRIPTION
Thoracic curve and T1 tilts to upper curve


TREATMENT
Use thru T2; do not assume that the upper (left) thoracic curve is non-structural without proof, and if there is any question, fuse the upper thoracic spine as well as the lower thoracic spine;


 

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