The capitulum on the humeral condyle articulates with the head
of the radius to form a pivot joint.
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Capitulum articulates with the head of radius
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the distal end of the humerus has two smooth condyles. the
lateral one, called the CAPITULUM is shaped somewhat like a wide
tire and articulates with the radius. the medial one, called the
TROCHLEA is pulleylike and articulates with the ulna.
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They form the articular part of the lower end of the humerus
bone, both are covered by hyaline cartilage.
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The fulcrum in this case would be your elbow joints.
more specifically the trochlea and capitulum on the humerus
which articulate with the radius and ulna