Sacroiliac Joint Flashcards

What is the function of the sacroiliac joint?

What are the auricular surfaces of the sacroiliac joint?

What is the surface of the sacroiliac joint like in a child?

What changes occur to the surface of the sacroiliac joint as an adult?

What type of joint is the anterior sacroiliac joint?

What happens to the cartilage of the sacroiliac joint with age?

What type of joint is the posterior sacroiliac joint?

What is the primary motion of the sacroiliac joint?

What prevents motion in the sacroiliac joint?

What type of joint is referenced for the posterior sacroiliac joint (no definition provided)?

Sacroiliac Joint Overview

Sacroiliac joint (SI) functions as a connection between the axial and appendicular skeleton.
Positioned anteriorly and slightly inferior to the posterior superior iliac spine (PSIS).

Articular Surfaces

Comprised of auricular surfaces from both the sacrum and ilium.
The joint surfaces differ in texture and structure between childhood and adulthood.

Surface Characteristics

In childhood, surfaces remain smooth.
In adulthood, surfaces develop irregular elevations and depressions, creating a roughened appearance that facilitates interlocking and limits normal movement.

Joint Classification

Anteriorly, the sacroiliac joint is classified as a plane synovial joint.
- Features articular cartilage and a space between the two bones.
- Age-related wear of cartilage leads to an amphiarthrotic characteristic, with approximately 10% of adults experiencing fusion, which reduces motion between the sacrum and pelvis.
Posteriorly, classified as syndesmosis.
- Here, two bones are connected by fibrous tissue (ligaments).

Motion and Limitations

Primary movement at the sacroiliac joint is anterior/posterior (A/P) rotation.
Joint motion is restricted by interlocking surfaces and ligaments, which prevent excessive movement.

This quiz consists of flashcards focused on the sacroiliac joint and its related structures. Learn the definitions and characteristics of the joint, articular surfaces, and developmental changes from childhood to adulthood. A great study tool for anatomy enthusiasts and medical students!