Sacroiliac Joint

(nutation/counternutation) occurs with trunk extension or hip flexion

counternutation

____, sometimes called sacral extension, refers to when the base of the sacrum moves posteriorly and superiorly, causing the tip of the coccyx to move anteriorly

counternutation

when the baby moves through the pelvic inlet during early stages of labor, the anterior-posterior diameter needs to be larger. therefore, the SI joints are in (nutation/counternutation)

counternutation

the SI joint has a(n) ___ reinforced by ligaments

fibrous capsule

the articular surface of the SI joint is lined with ____

hyaline cartilage

what helps to lock the 2 surfaces of the SI joint together

its irregular articular surfaces

the amount of motion that occurs in nutation and counternutation is ____, and can only occur in conjunction with other joint motions

minimal

the SI joint has very little ____

mobility

the SI joint is described as what kind of joint based on its number of axes (nonaxial/uniaxial/ biaxial/ triaxial)

nonaxial

(nutation/counternutation) occurs with trunk flexion or hip extension

nutation

______, sometimes referred to as sacral flexion, occurs when the base of the sacrum (on the superior end) moves anteriorly and inferiorly

nutation

in the later stages of labor, when the baby passes through the pelvic outlet, it is important that this anterior-posterior diameter has increased. putting the SI joints in (nutation/counternutation) increases the A-P diameter

nutation

the motions that occur at the SI joint are ___ and ___

nutation counternutation

during counternutation, the ____ becomes larger and can be visualized by drawing a line from the base of the sacrum across to the top of the symphysis pubis

pelvic inlet

during nutation, the ____ becomes larger and can be visualized by drawing a line from the tip of the coccyx to the bottom surface of the pubic symphysis

pelvic outlet

the shape of the SI jont is described as (hinge/pivot/plane/condyloid/saddle/ball and socket)

plane

during nutation, when the base of the sacrum (on the superior end) moves anteriorly and inferiorly, the inferior portion of the sacrum and coccyx move _____

posteriorly

the ___ joint is between the sacrum and the ilium

sacroiliac joint (SI Joint)

the SI joint is designed for great ____

stability

the SI joint is structure is described as (fibrous/cartilaginous/ synovial)

synovial

describe the SI joint structure

synovial nonaxial plane

____ lines the nonarticular portions of the SI joint

synovial membrane

what is the function of the SI joint

transmit weight from the upper body through the vertebral column to to the innominate bones