The specific structural combination at the elbow joint that prevents it from hyperextension is olecranon process and olecranon fossa on humerus.
Olecranon process of the ulna forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended.
The olecranon fossa is a deep triangular depression on the posterior side of the humerus, superior to the trochlea.
It provides space for the olecranon of the ulna during extension of the forearm.
Thus, the specific structural combination at the elbow joint that prevents it from hyperextension is olecranon process and olecranon fossa on humerus.
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