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