478 



THE INFERIOR EXTREMITY 



lies a quarter of an inch distal and three-quarters of an inch 

 posterior to the tip of the medial malleolus. The trochlear 

 process (peroneal tubercle) of the calcaneus can usually be felt 

 one finger's breadth below the lateral malleolus, but it is some- 

 times too small to be identified. When the foot is actively 

 everted the tendons of the peroncei, longus and brevis, can be 

 made out as they pass respectively above and below the 

 trochlear Drocess. 



Calcaneus 

 Trochlear proce 



Tuberosity of fifth metatarsal 

 Cuboid 



FIG. 140. The Bony Landmarks on the Lateral Aspect of the Ankle 

 and Foot. 



In active flexion of the ankle the extensor digitorum brevis 

 produces an elevation on the lateral part of the dorsal aspect of 

 the foot, and, when the muscle is relaxed, pseudo-fluctuation 

 can be obtained by palpating it transversely. The posterior 

 part of the muscle overlies the calcaneo- cuboid joint (p. 484), 

 and behind the joint the anterior part of the upper surface of 

 the calcaneus can readily be distinguished. 



The tuberosity on the base of the fifth metatarsal, which lies 

 three fingers' breadths in front of the lateral malleolus, forms 

 a prominent landmark on the lateral border of the foot. It 



