Questions and Answers
What is the function of the sacroiliac joint?
What are the auricular surfaces of the sacroiliac joint?
Sacrum and ilium
What is the surface of the sacroiliac joint like in a child?
Smooth
What changes occur to the surface of the sacroiliac joint as an adult?
Signup and view all the answers
What type of joint is the anterior sacroiliac joint?
Signup and view all the answers
What happens to the cartilage of the sacroiliac joint with age?
Signup and view all the answers
What type of joint is the posterior sacroiliac joint?
Signup and view all the answers
What is the primary motion of the sacroiliac joint?
Signup and view all the answers
What prevents motion in the sacroiliac joint?
Signup and view all the answers
What type of joint is referenced for the posterior sacroiliac joint (no definition provided)?
Signup and view all the answers
Study Notes
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
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!
