Assertion: elbow's joint | /r/CapableOf | allow flexion
Facets:
Source sentences:
text: Hinge joints allow flexion and extension only.
text: The orientation of the bones forming the elbow joint produces a hinge type synovial joint, which allows for extension and flexion of the forearm:
text: Going back to the terminology from last week, the hinge joint allows flexion and extension.