Which of the following joints is listed as an S-Joint?

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The S-Joint refers to the sacroiliac joint, the hinge-like connection between the sacrum and the ilium. It sits at the base of the spine and pelvis and is the main link that transfers load from the upper body down into the pelvis. Because it’s built to be very stable, it has limited motion and is held in place by a strong ligament system, including the interosseous, anterior and posterior sacroiliac ligaments, and the sacrotuberous and sacrospinous ligaments. This stability is crucial for bearing and transmitting weight during standing and walking, while still allowing tiny movements to absorb forces.

The other options aren’t S-Joints. The spine is a series of vertebral joints, not a single sacroiliac joint. The pubic symphysis is a cartilaginous joint between the pubic bones with fibrocartilage in between, allowing only slight movement. The acromioclavicular joint is the shoulder joint between the clavicle and the acromion, not part of the pelvis.