Ankylosing spondylitis and chalk stick fracture

Case contributed by Dr Mersad Mehrnahad


Known case of ankylosing spondylitis with history of falling. Attends the emergency department.

Patient Data

Age: 67yr
Gender: Male

In lumbar and pelvic frontal views, ankylosis of bilateral Si joints is seen.

Interspinous ligament calcification seen as 'dagger' spine associated with 'bamboo spine' is depicted.

All findings are secondary to ankylosing spondylitis.

Syndesmophytes, ankylosis of bilateral costovertebral and post facet joints associated with fracture line (arrow) with extension from anterior vertebral body to posterior part of vertebral body characteristic of chalk stick fracture is depicted.

Beside typical findings of ankylosing spondylitis e.g. calcification of interspinouse ligaments,shiny corner sign , syndesmophytic ankylosis  and anderson lesion,patient suffer from chalk stick fracture(arrow) after falling, a type of fracture that occurs in fused spine.

Case Discussion

Chalk stick fracture of fused spine seen in patient with history of ankylosing spondylitis.

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Case information

rID: 52572
Published: 16th Apr 2017
Last edited: 14th Aug 2019
Inclusion in quiz mode: Excluded

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