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SPONDYLOLISTHESIS (6 CLASSIFICATIONS (TYPE 3 DEGENERATIVE (long standing…
SPONDYLOLISTHESIS
6 CLASSIFICATIONS
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TYPE 3 DEGENERATIVE
- long standing elongation & remodeling of facet joints
- disc slip forward / back / lateral
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- L4, 10% - 15% slip
- anterior oblique view contralateral side in lumbar
- posterior oblique view ipsilateral side in lumbar
TYPE 4 TRAUMATIC fracture posterior arch, C2 Hangman’s fracture, pars ok
TYPE 5 PATHOLOGIC local bone dx (metastasis, Paget’s, osteopetrosis)
Type 6 IATROGENIC stress fracture above / below fusion, weakening due to removal in laminectomy
SpondilopTosis 100% displacement of VB in relation to segment below, Meyerding Gr 5
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SpondyloLysis
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- may not see pars, difficult to see L5
- “scotty dog” neck with collar
Imaging
sclerotic endplates,
notching of inf endplate of sup vertebrae
rounding of sup endplate of inf vertebrae
buttressing