Articular Area of Proximal Part of Ulna
Area articularis partis proximalis ulnae
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The articular area of proximal part of ulna is the concave, superior end of the bone. It includes both the trochlear and radial notches of the ulna.
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Ulna
A greenstick fracture is a complete fracture of the tension side of the cortex of the radius or ulna, and a plastic deformation (buckling) of the compression side of the same bone.