AFAA Personal Trainer Certification Practice Exam

In terms of range of motion, which characteristic does the glenohumeral joint possess?

1. Uniaxial

2. Multiaxial

3. Non-axial

4. Triaxial

The correct answer is: Multiaxial

The glenohumeral joint, commonly known as the shoulder joint, is classified as a multiaxial joint due to its capacity to move in multiple directions across multiple axes. This design allows for a wide range of motion, enabling movements such as flexion, extension, abduction, adduction, and rotation. The structure of the joint facilitates various movements, making it one of the most versatile and mobile joints in the human body. While other classifications such as uniaxial or triaxial describe joints that operate in fewer axes or with limited movement, the designation as a multiaxial joint is fitting because of the shoulder's ability to achieve a full circular movement and to move through a three-dimensional space. This unique characteristic is essential for many everyday activities and athletic motions, providing the shoulder with the flexibility required for comprehensive functional movement.