Flashcards in Sacro-Iliac Joint Deck (35)
What joint classifications are present at the sacro-iliac joint?
- synovial plane (diarthrosis arthrodia)
- fibrous (amphiarthrosis syndesmosis)
What is the name of the articular surface of the sacrum at the sacro-iliac joint?
the auricular surface of the sacrum
What is the name of the articular surface of the ilium at the sacro-iliac joint?
the auricular surface of the ilium
What is the auricular surface of sacrum composed of?
true articular cartilage, a modification of hyaline cartilage
What is the auricular surface of the ilium composed of?
articular cartilage, interspersed with fibrocartilage
What is the superficial appearance of the auricular surfaces of the sacro-iliac joint in infancy?
both the sacrum and ilium are smooth surfaced at the sacro-iliac joint
What is the superficial appearance of the auricular surfaces of the sacro-iliac joint by age 15?
the sacrum develops a sacral groove while the ilium develops an iliac ridge
Which gender is biased with greater unevenness of the auricular surface of the sacro-iliac joint?
What additional modifications of the auricular surfaces of the sacro-iliac joint may occur?
posterior to the sacral groove and iliac ridge, an iliac tuberosity and sacral fossa appear
What forms the accessory sacro-iliac joint?
the sacral tuberosity and the iliac sulcus
What pathological or age-related modifications of the sacro-iliac joint may occur?
degenerative arthrosis and ankylosis
What does degenerative arthrosis mean?
a condition of degeneration of the joint, sometimes referred to as degenerative joint disease (DJD)
What does ankylosis mean?
a condition of fibrous adhesion occurs within the joint
What is the age and surface bias associated with degenerative arthrosis of the sacro-iliac joint?
age 40, the iliac auricular surface
What is the age and gender bias associated with ankylosis of the sacro-iliac joint?
age 50 and male bias, particularly in African American males
What is the function of the sacro-iliac joint?
it transfers weight from the vertebral column onto the pelvic girdle and lower extremity
What movements at the sacro-iliac joint are described as forward nodding and backward nodding?
nutation and counternutation, respectively
Which part of the sacro-iliac joint is in motion during nutation and counternutation?
the ilium or pelvis in general
What are the attachment sites of the capsular lig of the sacro-iliac joint?
at the margins of the auricular surfaces of the sacrum and ilium
What is unusual about the capsular lig of the sacro-iliac joint?
it appears to be absent on the posterior margin of the sacro-iliac joint
What are the accessory ligs of the sacro-iliac joint?
- anterior sacro-iliac lig
- interosseous sacro-iliac lig
- posterior sacro-iliac lig
What joint classification is associated with the accessory ligs of the sacro-iliac joint?
fibrous (amphiarthrosis) syndesmosis
What is unusual about the anterior sacro-iliac lig?
it appears to be a condensation or thickening of the fibrous capsule of the sacro-iliac joint
What are the attachment sites of the anterior sacro-iliac joint?
at the anterior and inferior margins of the capsular lig
At what location is the anterior sacroiliac lig best developed?
along the arcuate line and posterior inferior iliac spine (PSIS) of the ilium
What is the age and gender bias associated with ossification of the anterior sacro-iliac lig?
age 40 and male bias
Which is the strongest of the sacro-iliac lig?
the interosseous sacro-iliac lig
What are the attachment sites of the interosseous sacroiliac lig?
at the sacral tuberosity and the iliac sulcus
What is the relationship between the capsular and interosseous sacroiliac lig?
the interosseous sacroiliac lig replaces the capsular lig posteriorly