The elbow joints allow only flexion and extension and are stable hinge joints that operate very smoothly.
Elbow Joints
The elbow joints allow only
flexion and extension and are stable hinge joints that operate very smoothly.
The radius and ulna bones both articulate inside each elbow joint with the
condyles of the humerus. The hinge of the elbow joint is formed by the tight
gripping of the troch-lea by the trochlear notch of the ulna. Joint
stabilization is provided by this structure. The articular capsule is
rel-atively loose. It extends inferiorly from the humerus to the radius and
ulna and to the annular
ligament that surrounds the head of the
radius. The humeroulnar joint is the largest and strongest articulation at the
elbow.
The articular capsule of the
elbow joint is thin both anteriorly and posteriorly. Two strong capsular
ligaments restrict horizontal movements: the medial ulnar
collateral ligament and the triangular radial collateral ligament on the lateral side. Several arm
muscle ligaments also cross the elbow
joint to make it more secure. These are the tendons of the biceps and tri-ceps.
The radius has less activity in movements of the elbow, but its head rotates
inside the annular ligament during both pronation and supination of the forearm.
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