Which facet of the calc is the most weight bearing? - Answer --posterior facet
2 MOI of Calc FX's:
1.
2. - Answer -1. axial load (talus acts as a wedge, drives through calc)
2. avulsion
-from achilles detachment
-sudden forceful ankle dorsiflexion
Most common type of Calc FX's: - Answer --Intra-articular fx's
Classification system used for Intra-articular calc fx: - Answer --Essex-Lopresti
Primary FX line of a calc fx begins obliquely through the ____________ facet forming 2
fragments. - Answer --posterior
Secondary FX line of a calc fx exits posteriorly in a ____________________ fx. -
Answer --tongue-type fx
Secondary FX line of a calc fx exits just behind the facet in a _______________ fx. -
Answer --joint-depression fx
Normal Boehlers angle of a Calc is: - Answer --25-40 degrees
Normal Gissane's angle of a Calc is: - Answer --120-140 degrees
The _________________ articulation is subjected more load per unit area than any
other joint in the body. - Answer --tibiotalar
The talus receives forces of ____-____x BW during normal ambulation. - Answer --5-
10x
Over ______% of the talar surface is covered by a 1-2mm thick hyaline cartilage w/
poor regenerative potential. - Answer --70%
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