Means closure of a joint angle, or reduction of an angle between two bones Extension Mean straightening of a joint or an increase in the angle between two bones

When the knee flexes, the ankle moves closer to the buttock, and the angle between the femur and tibia gets smaller. Extension refers to a movement that increases the angle between two body parts. Extension at the elbow is increasing the angle between the ulna and the humerus.

In this class I explain what the opening angle and closing angle of a joint is.What closing angle joint pain is and how to work around it.

Closing angle joint pain (CAJP), is pain that is felt in a joint when the angle between two bones is decreasing or the bones are coming together. This is an indication that there is an underlying dysfunction in that joint.