Chalk stick fracture

Dr Craig Hacking et al.

Chalk stick or carrot stick fractures are fractures of a fused spine, classically seen in ankylosing spondylitis.

Some authors define the chalk stick fracture as a fracture through a Pagetoid long bone (see Paget disease).

They usually occur through the disco-vertebral junction in the lower cervical or upper thoracic spine.

When several contiguous segments of the spine are fused, the fused column acts as a lever arm. This places greater than normal stresses on the spine. These fractures often occur following minimal trauma due to the altered biomechanics of the spine.

Chalk stick fractures may also been seen in:

  • DISH
  • surgical spinal fusion

Not surprisingly, it is named because of the resemblance of the fracture to breaking a chalk stick or a carrot.

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Article information

rID: 41742
Section: Gamuts
Tag: refs
Synonyms or Alternate Spellings:
  • Chalk fracture
  • Carrot stick fracture

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Cases and figures

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    Figure 1: broken chalk stick
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    Case 1
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    6 weeks later

    Case 2
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    Initial CT

A min...
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    Case 4
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    sagittal MPR
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    Case 6
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    Chalk stick fract...
    Case 7
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