Definition
Block vertebrae, fused vertebrae which, in radiographs, give
the appearance of a more or less solid bony mass.
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Radiographic Appearance
Diagnostic findings, fused vertebrae which, in
radiographs, give the appearance of a more or less solid bony mass.
Rudimentary discal spacing (thin & flat) Patency of intervertebral
foramina
Intra-discal calcification Wasp waist deformity (segmental
hypoplasia)
Decreased lordotic angulation Flexion/extension views may
demonstrate a bentstick deformity (compensatory hypermobility)
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Pathology
Block vertebra (congenital synostosis)
Osseous fusion occurring between 2 vertebrae as a result of
congenital non-segmentation.
Classification
Complete: Fusion involving the anterior & posterior elements of at
least two segments.
Incomplete: Vertebral body fusion of two segments or more
Location in order of frequency
1) Cervical spine: C2-3, C5-6
2) Lumbar spine: L4-5
3) Thoracic spine: any section
Clinical findings
Most cases are asymptomatic
The radiographic findings are incidental to an unrelated clinical
condition
In cases where symptoms do arise, the clinical features will relate
to compensatory hypermobility with facet joint inflammation (facet
syndrome)
The loss of a functional unit increases mechanical demands on
adjacent segments (usually, the one above)
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Treatment:
Treatment is generally physiotherapy to relieve any symtoms, surgery
may be needed in special cases. |
Images
Single and Multiple block vertebra
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Useful Link http://web.idirect.com
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