lec 7 joints & ligaments of pelvis Flashcards
lumbosacral junction is what type of joint
secondary cartilaginous
where is lumbosacral junction
b/t L5 and base of sacrum
hyperlordosis
increase in sacral inclination and decrease in lumbosacral angle
more exaggerated lumbar curve
movement at sagittal plane of lumbosacral joint
flexion and extension
movement at coronal plane of lumbosacral joint
some side bending
movement at horizontal plane of lumbosacral joint
some rotation
what is sacroiliac joint
articulation b/t axial and appendicular skeleton
classification of sacroiliac joitn
Plane synovial joint (between auricular surfaces of sacrum and ilium) syndesmosis (between sacral and iliac tuberosities)
What are the adaptations of the sacroiliac joint that limit movement, but facilitate weight transfer?
rough interlocking articular surfaces
interosseous ligaments
accessory ligaments
what are movements of sacroiliac joint
1-8 degrees
ankylosis
fusion
What is the function of the ridges and furrows on the auricular surfaces?
They contribute to the stability and strength of the joint
They can be used to determine age
what ligament is found at tuberosities of sacrum and ilium
interosseous ligament
anteriorly what is sacroiliac fibrous joint comprised of
bands of capsular ligaments (thickenings of fibrous capsule)
What is the medial attachment of the ventral sacroiliac ligament?
Base and pelvic surface of sacral segments S1-S3
What is the lateral attachment of the ventral sacroiliac ligament?
Medial edge of the iliac fossa (thick @ arcuate line and preauricular sulcus)
What is the strongest link between the ilium and sacrum?
The interosseous sacroiliac ligament (syndesmosis/fibrous joint)
What is the medial attachment of the sacroiliac ligament?
sacral tuberosity
What is the lateral attachment of the sacroiliac ligament?
iliac tuberosity
where are extrascapular ligaments
posteriorly
Which sacroiliac ligaments are extracapsular?
dorsal sacroiliac ligaments
Where does the short dorsal sacroiliac ligament run?
From sacral base to proximal 1/2 of intermediate sacral crest
To the iliac tuberosity
where does the long dorsal sacroiliac ligament run
from lateral sacral crest (S3/4) to PSIS
what is the iliolumbar ligament
A series of bands from L5 body to t.p. To iliac crest, iliac tuberosity, upper surface of sacral ala & ventral sacroiliac ligament
function of iliolumbar ligament
To resist flexion, extension, rotation, and side bending (to stabilize)
What are the accessory ligaments of the pelvic region?
Iliolumbar ligament
Sacrotuberous ligament
Sacrospinous ligament
Where does the sacrotuberous ligament run?
From - medial edge of ischial tuberosity
To - PSIS & PIIS, lateral sacral crest, and coccyx
What does the sacrospinous ligament run?
From - ischial spine
To - lateral edge of S4 & S5 and coccyx
The sacrotuberous ligament is next to what tendon of the lower extremity?
The tendon of the long head of biceps Femoris and semitendinosus
What is the function of the sacrotuberous and sacrospinous ligaments?
Resist (limit) upward movement of sacral apex
What type of joint is the pubic symphysis?
Secondary cartilaginous type joint
Fibrocartilaginous interpubic disc
Thin hyaline cartilage on symphyseal surfaces
What are the ligaments that attach to the pubic symphysis?
Superior pubic
Arcuate pubic
And anterior & posterior pubic
