Sacroiliac Joint Flashcards Preview

Orthopedic Diagnosis > Sacroiliac Joint > Flashcards

Flashcards in Sacroiliac Joint Deck (18):
1

the iliac joint surfaces are made up of:

fibrocartilage

2

the sacral joint surfaces are made up of:

hyaline cartilage
3-5x thicker than fibrocartilage

3

What type of joint is the SI joint

a synovial articulation or diarthrosis

4

Anterior sacral ligament

an anterior inferior thickening of the fibrous capsule
relatively weak compared to the rest of the SI ligaments
extends between the anterior inferior borders of the iliac auricular surface and anterior border of the sacral auricular surface

5

Interosseous Ligament

a short ligament located deep to the dorsal SI ligament
forms the major connection between the sacrum and the innominate

6

Dorsal SI ligament

tough strong ligament
connects PSIS with lateral crest at S3/S4
made slack with nutation and taught with counternutation

7

Sacrospinous Ligament

three large fibrous bands
stabilizes against nutation
counteracts against the dorsal and cranial migration of the sacral apex during weight bearing

8

Sacrotuberous Ligament

extends from the ischial tuberosity to the lateral margin of the ilium, sacrum, and coccyx
counteracts nutation of the sacrum

9

Pubic symphysis

no synovial tissue, contains a fibrocartilaginous disc
bone surfaces of this joint are covered with hyaline cartilage but kept apart by the disc

10

How many muscles attach to the sacrum and/or innominate?

35
primarily stabilize the SI joint rather than move it

11

Piriformis

primarily functions to produce external rotation and abduction of the femur
also thought to function as an internal rotator and abductor of the hip when flexed beyond 90 deg.

12

Pelvic Floor Muscles include:

Levator ani group:
pubococcygeus, puborectalis, and iliococcygeus
and the coccygeus muscle

13

Function of pelvic floor muscles

work in a coordinated manner to increase intra-abdominal pressure, provide rectal support, inhibit bladder activity, help support pelvic organs, and assist in lumbopelvic stability

14

Innervation of the anterior portion of the SI joint

posterior rami of L2-S2 roots
highly variable and may differ among individuals

15

Chiropractic Model of SI biomechanics

as one innominate flexes, the ipsilateral sacral base moves anterior and inferior and as the other innominate extends, the sacral base on that side moves posterior and superior

16

Osteopathic model of SI biomechanics

the sacrum rotates around two oblique axes
the innominates are capable of rotating anteriorly and posterior

17

SI joint Stress tests

Gaenslen's
Lewin Gaenslen's
Hibb
Fabere

18

SI joint stress tests are designed to:

assess the integrity of the joint and surrounding ligaments
believed to be sensitive for severe arthritis or ventral ligament tears