Definition
Jones fracture involves a fracture at the base of fifth
metatarsal at metaphyseal-diaphyseal junction, which typically
extends into the 4-5 intermetatarsal facet;
A Jones fracture is located within 1.5 cm distal to tuberosity of
5th metatarsal & should
not be confused w/ more common avulsion fracture of the 5th
metatarsal styloid process.
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Radiographic Appearance
In addition to fracture's location (which
distinguishes avulsion from Jones frx), it is important to note
characteristic features at the fracture site;
acute fractures should show sharp fracture margins and no
intramedullary sclerosis, delayed union will show persistent
fracture line in both cortices, periosteal callus and
intra-medullary sclerosis, a stress fracture is revealed by a
widened fracture line and varying degrees of meduallary sclerosis;
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Pathology
Fractures of the fifth metatarsal of the foot are surprisingly
controversial among radiologists, particularly concerning proximal
metatarsal fractures. Some term these fractures Jones fractures,
others dancers fractures, while others simply term them proximal
metatarsal fractures. According to Orthopedic Radiology (Adam
Greenspan, 3rd edition), a "true Jones" fracture occurs one inch
distal to the base of the fifth metatarsal. It is not due to
peroneus brevis tendon avulsion but rather a twisting inversion
injury to the foot. Greenspan states that more proximal injuries are
frequently misinterpreted as Jones fractures but really are avulsion
fractures by the peroneus brevis tendon. These latter fractures heal
quickly, while more distal fractures may undergo fibrous union only.
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Treatment:
Non-weight bearing in a short leg cast for 4 - 6 weeks
Surgical intervention is often required.
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Images
 
1 Jones Fracture
2 Avulsion fracture
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3 Fixed Jones fracture
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Useful Link
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