490 



THE INFERIOR EXTREMITY 



after falling from a height, lands upon his feet. They commonly 

 involve either the talus or the calcaneus. 



The neck of the talus may be fractured transversely, or the 

 body of the bone may be crushed between the calcaneus and 





FIG. 146. Avulsion Fracture of the Calcaneus. The fragment has been 

 fixed in position with a screw. Note the increased density of the shadow 

 caused by the superimposed lateral malleolus. It partially obscures the 

 os trigonum tarsi, which is present in this case. 



the' tibia. The condition is always accompanied by considerable 

 limitation of movement at the ankle-joint. 



Fracture of -the calcaneus, which is the commonest fracture 

 of the tarsus, is usually comminuted and is often bilateral. If 

 there is little comminution, the fracture may be overlooked, 

 unless X-rays are employed, as the collateral ligaments of the 

 ankle and the tendons in relation to the calcaneus retain the 



