Even though both radioulnar joints are freely moveable diarthrodial joints, the joint between the shafts of the two bones is referred to as being syndesmosis.

Question

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The joint between the shafts of the radius and ulna is a syndesmosis, which is a type of fibrous joint characterized by a ligamentous connection, allowing for limited movement, unlike the freely movable diarthrodial (synovial) joints found at either end of these bones.

Even Though Both Radioulnar Joints Are Freely Moveable Diarthrodial Joints