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Injury at Elbow complex - Coggle Diagram
Injury at Elbow complex
Compression injuries
Resistance to longitudinal compression forces at the elbow is
provided mainly by the contact on bony surfaces
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Example;
Falling on the hand when the elbow is in close- packed position will transmit the forces to the elbow via the forearm
if the elbow is in valgus stress,
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- tear of the central band of the interosseous mmebrane may be accompanied
If the forces are transmitted through the ulna,
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If the forces are not absorbed by the ulna or radius during the
fracturing supracondylar area of the humerus may also fracture
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Distraction injuries
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A tensile force of sufficient magnitude
exerted on a pronated and extended arm
may cause the radius to be pulled inferiorly
out of the annular ligament
- Dislocation of radial head
- Common in children younger than 5 years
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Varus/Valgus Injuries
Distraction and compression forces are
created if either one of the collateral
ligaments is overstretched or torn
If one side of the joint is subjected to
abnormal tensile stresses, the other side is
subjected to abnormal compressive forces
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Overuse injuries
Example:
Medial collateral ligament is subjected to tensile
stress when throwing a ball in “cock-up” phase
If the stress is repetitive, like in a baseball player
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The normal carrying angle will be increased and excessive compression will be applied on the lateral aspect of the joint
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If prolonged compressive forces are maintained on the capitulum, blood supply would be interfered leading to avascular necrosis of capitulum
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