JOINTS OF THE FOOT 



429 



with the corresponding posterior facet on the dorsal surface 

 of the calcaneus. Its head, on the other hand, is received 

 into a large socket, which is formed for it by the susten- 

 taculum tali of the calcaneus, the navicular, and two 

 ligaments which pass between the calcaneus and the 

 navicular viz., one below, the plantar calcaneo-navicular, 

 and anoiher on the lateral side, the calcaneo-navicular part 

 of the bifurcate ligament. The two taloid articulations are 

 quite distinct. 



The ligaments which hold the talus in its place are five 

 in number. Four are attached to the calcaneus and one to 

 the navicular bone. They are : 



1. Lig. talo-calcaneum interosseum. 



2. Lig. talo-calcaneum laterale. 



3. Lig. talo-calcaneum mediale. 



4. Lig. talo-calcaneum posterius. 



5. Lig. talo-naviculare [dorsale]. 



The interosseous talo-calcanean ligament is by far the most 

 powerful. It occupies the tarsal canal, and consists of strong 

 fibres attached dis- 

 tally to the groove 

 between the articu- 

 lar facets on the 

 dorsal surface of 

 the calcaneus, and 

 proximally to 

 the corresponding 

 groove on the 

 plantar surface of 

 the talus. 



The lateral liga- 

 ment is a short band 

 of fibres which pro- 

 ceeds from the 

 lateral surface of 

 the talus to the 



lateral Surface of FIG. 198. Talus removed so as to show the 

 the calcaneus. It socket for its head. 



is parallel with the 



calcaneo-fibular ligament of the ankle joint, but it is placed 



on a deeper plane, and lies somewhat more anteriorly. 



The medial talo-calcanean ligament passes distally and 



- Posterior surface of navicular 

 Plantar calcaneo-navicular 

 ligament 



Calcaneo-navicular part 

 of bifurcate ligament 



Facet on calcaneus 

 for head of talus 



Interosseous talo- 

 calcanean ligament 

 (cut) 



Facet on calcaneus 

 for body of talus 



