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As a complex hinge joint, the knee joint is one of the main load-bearing joints of the human body, supporting different movements in daily activities.

Some joints — like hinge joints — help us move in different ways.

In humans, "when we flex our elbows, both forearm bones follow the hinge joint to fold in toward the upper arm," the researchers said.

Corrosion on the farm’s metal walkway grating and substructures was accelerating, and some metal hinge joints showed signs of excess wear.

INCIDENTS: One report of the stroller hinge joint separating.