If someone is turning a doorknob counter clockwise using their right hand, what arthrokinematic direction is the Radius moving?
Understand the Problem
The question describes a scenario involving turning a doorknob counter-clockwise with the right hand and asks about the arthrokinematic movement of the radius bone. Arthrokinematics refers to the movement between joint surfaces, so the question is asking us to consider how the radius bone moves (anteriorly, posteriorly, medially, or laterally) in relation to the other bones in the forearm during this action.
Answer
The radius bone is rotating outward, which is called supination.
When turning a doorknob counter-clockwise with the right hand, the radius bone is rotating outward, which is called supination. During supination, the radius rolls and slides in the same direction.
Answer for screen readers
When turning a doorknob counter-clockwise with the right hand, the radius bone is rotating outward, which is called supination. During supination, the radius rolls and slides in the same direction.
More Information
Arthrokinematics refers to the movement between joint surfaces. The movement of the radius during turning a doorknob involves both rolling and sliding relative to the ulna at the radioulnar joint.
Tips
A common mistake is confusing the terms supination and pronation. Supination involves turning the palm upward or outward, while pronation involves turning the palm downward or inward.
Sources
- The Elbow And Forearm In Movement - 3D Muscle Lab - 3dmusclelab.com
- Arthrokinematics - Physiopedia - physio-pedia.com
- Describe the rotational movements performed when turning a ... - homework.study.com
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