A patient falls while skiing and sustains a supracondylar fracture. the nurse knows that Volkmann's ischemic contracture is the most serious complication of a supracondylar fracture of the Humerus
Humerus
It is a single long bone.
proximally a head with a bicipital groove is present.
Head is without a cartilaginous cap.
On the either side of the head, greater and lesser tuberosities are present.
Deltoid ridge is not prominent.
Distally a pully-like trochlea is present.
Above the trochlea, an Olecranon fossa is present in the center of which a supra-trochelar foramen is present.
Proximally the head fits into glenoid cavity of pectoral girdle and distally trochlea fits with sigmoid notch of radius ulna.
It is the bone of upper arm.
Bone:
It forms the major part of the vertebrate endoskeleton.
it is hard, highly calcified, rigid connective tissue. the matrix is dense and hard .
About 70% of dry weight of it is formed of inorganic salts ( mainly calcium phosphate and calcium carbonate and traces of calcium fluoride and magnesium fluoride) .
30% of it is formed of protein called Ossein.
The bone cells are called osteo-cytes.
They are spider shaped and having a number of protoplasmic processes called canaliculi.
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