Lateral x-rays of intraarticular fracture usually show
- If entire facet is separated from the sustentaculum & depressed
- Decrease (loss) in height of posterior facet
- Decrease in angle of Bohler
- Increase in angle of Gissane
- Only lateral half of posterior facet is fractured & displaced
- Normal Bohler & Gissane angle
- Split is seen as double density
- Radiological Feature of Fracture Calcaneum (on lateral view)
- Tuber angle of Bohler (Tuber-joint angle)
- It is formed between -A line drawn from highest points of anterior process & highest point of posterior facet and a line drawn tangentially to the superior edge of the tuberosity.
- It is normal between 20 - 40 degrees.
Flattening /Reduction/Reversal of this angle indicates
i. Weight bearing posterior facet has collapsed (intraarticular fracture) or
ii. Degree of proximal displacement of the tuberosity (intraarticular & extra articular fracture both).
- Crucial angle of Gissane
- Formed by two cortical struts extending laterally, one along the lateral margin of posterior facet & other extending to the beak of the calcaneus Normally it is an obtuse angle of 95 - 105 degree.
- It increase in intra articular fracture Neutral triangle is the area between trabeculae of Calcaneum.
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