Joints Of Lower Extremity

Question 1

Sacroiliac joint

Answer 1

Synovial joint
Articulation between a sacrum in the illium
sacrum is lined with hyaline cartilage
Illium is lined with fibrocartilage

Both services contain irregular shapes that help the bone interlock
Strong joint capsule and the strongest ligaments in the body support it

Question 2

Interosseous sacroiliac ligaments

Answer 2

Massive, strong ligaments that unite the sacra and iliac tuberosities

Question 3

Posterior sacroiliac ligaments

Answer 3

Composed of short and long fibers that connect the sacrum and ilium posteriorly

It blends with a sacrotuberous ligament

Question 4

Anterior sacroiliac ligaments

Answer 4

Transverse fibers that support the anterior and inferior portion of the sacroiliac joint

Question 5

Iliolumbar ligament

Answer 5

Accessory ligament of the sacroiliac joint

Supports the L5 - S1 joint

Question 6

Sacrotuberous ligament

Answer 6

Help support the sacroiliac joint by preventing upward movement (nutation) of the sacrum

Question 7

Sacrospinous ligament

Answer 7

Help support the sacroiliac joint by preventing upward movement of the sacrum

Question 8

SI dysfunction

Answer 8

Result of impaired load transfer through the SI joints

Question 9

Nutation of sacrum

Answer 9

Nutation of the sacrum is restrained by the Sacrotuberous ligament (anterior motion relative to the iliac)

Further enhance by action of biceps femoris attachment to ischial tuberosity

Question 10

Counternutation of the sacrum

Answer 10

Is restrained by the long dorsal sacroiliac ligament

And further enhance by action of latissimus dorsi through with attachment via thoracolumbar fascia

Question 11

Load transfer through pelvic girdle

Answer 11

Load transferred through the pelvic girdle is more effective when the sacrum is nutated or tilted forward at its superior aspect

Question 12

How is amplitude of sacral nutation controlled

Answer 12

It is controlled by co activation of pelvic floor muscles and sacral Multifidis