Calcanéum
The calcanéum is bulkiest of the bones of the tarsus. The Tendon calcanéen fits into the level of its posterior face, which forms the posterior projection of the foot, or heel.
According to the pr. G.Menegaux:
Le calcanéum is made of spongy fabrics, surrounded on all its faces by a hull compacts (or Corticale) this one, relatively thin everywhere else, is on the contrary very thick on the level of the Thalamus ( note: postéro-external articular facet for the Slope ), thus is formed a resistant part which can be inserted in block in spongy fabric (see Angle of Böher).
A cut of the calcanéum, practiced in a sagittal plan, shows that the thalamus is supported by a fiber system obliquely directed in bottom and behind. ( note: they are the channels of Havers of the calcanéum )
Another part, from less important force, goes from thalamus towards the large one and small the Apophyse of the calcanéum.
Between these various fibers of reinforcement thus exists a weak point which one clearly distinguishes on a radiography in the form from a clear spot where a thalamus fractured ( note can easily penetrate: this weak point is just in lower part and posterior sine of the tarsus )
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