[1] : The Collaborative International Dictionary of English v.0.48

talus \ta"lus\, n.; pl. tali. l., the ankle, the ankle bone.
   1. anat. the astragalus.
      1913 webster

   2. surg. a variety of clubfoot talipes calcaneus. see
      the note under talipes.
      1913 webster
see also:
tali talipes calcaneus talipes 

[2] : WordNet (r) 2.0

talipes calcaneus
     n : talipes in which the toes are pointed upward and the person
         walks on the heel of the foot

Talipes >> T Words
Talipes, definition of term: Talipes
talipes_pag1.html

Calcaneus >> C Words
Calcaneus, definition of term: Calcaneus
calcaneus_pag1.html