An example of a multiaxial joint is
Question 9 options:
the pubic symphysis.
the proximal radioulnar joint.
the hip.
an intervertebral joint, between the articular processes.
The Correct Answer and Explanation is:
Correct Answer: The hip.
Explanation:
A multiaxial joint (also called a triaxial joint) is a type of synovial joint that allows movement along three axes: forward and backward (flexion and extension), side to side (abduction and adduction), and rotationally (medial and lateral rotation). These joints offer the widest range of motion of any joint type in the human body.
The hip joint is a classic example of a multiaxial joint. It is a ball-and-socket joint formed where the head of the femur fits into the acetabulum of the pelvis. Because of its structure, the hip joint allows movements in multiple planes:
- Sagittal plane: flexion and extension
- Frontal plane: abduction and adduction
- Transverse plane: internal (medial) and external (lateral) rotation
In addition, the hip allows circumduction, which is a combination of all these movements in a circular motion. This versatility makes the hip essential for walking, running, sitting, standing, and numerous other daily activities.
Let’s contrast this with the other options:
- The pubic symphysis is a cartilaginous joint (specifically, a symphysis), allowing only very limited movement. It is not a synovial joint and certainly not multiaxial.
- The proximal radioulnar joint is a pivot joint, which allows rotation around a single axis (uniaxial), such as turning the palm up or down (pronation and supination of the forearm).
- Intervertebral joints between articular processes are plane joints, which primarily allow small gliding movements—again, not multiaxial.
Therefore, only the hip joint qualifies as a multiaxial joint due to its ball-and-socket structure and its ability to move in all three anatomical planes. The shoulder is another example of a multiaxial joint, but among the listed options, the hip is the correct and only suitable choice
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