Podcast
Questions and Answers
What is the function of the sacroiliac joint?
What is the function of the sacroiliac joint?
- Enables full mobility of pelvic bones
- Links axial and appendicular skeleton (correct)
- Acts as a shock absorber
- Supports the weight of the upper body
What are the auricular surfaces 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?
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?
What changes occur to the surface of the sacroiliac joint as an adult?
What type of joint is the anterior sacroiliac joint?
What type of joint is the anterior sacroiliac joint?
What happens to the cartilage of the sacroiliac joint with age?
What happens to the cartilage of the sacroiliac joint with age?
What type of joint is the posterior sacroiliac joint?
What type of joint is the posterior sacroiliac joint?
What is the primary motion of the sacroiliac joint?
What is the primary motion of the sacroiliac joint?
What prevents motion in the sacroiliac joint?
What prevents motion in the sacroiliac joint?
What type of joint is referenced for the posterior sacroiliac joint (no definition provided)?
What type of joint is referenced for the posterior sacroiliac joint (no definition provided)?
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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.
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