http://www.podiatry-arena.com/podiatry-forum/showthread.php?t=23893 (muscle attachment)
Historically referred to as the astragalus
Located above calcaneus transmits body weight from the tibia to the calcaneus and navicular.
Consists of an irregular cuboidal body (corpus tali) with a forward and medially projecting head (caput tali) and neck (collum tali).
Trochlea surface for articulation with tibia is wider anteriorly has implications for stability of foot when dorsiflexed or plantarflexed. For foot to dorsiflex, the malleoli must separate to accommodate the wider anterior part of trochlea surface.
Posterolateral tubercle may be enlarged or be associated with accessory bone (os trigonum)
Large number of variations is seen in the talus.
Ossification: - from one centre (sometimes two that may still be present at birth)
- appears in 6th intrauterine month
- os trigonum may be secondary centre that does not fuse – in up to 10%
Talus has no muscular attachments.
• body is supplied by artery in sinus tarsi
• head and neck supplied by dorsalis pedis
• posterior tubercle is supplied from medial calcaneal artery