Part 20: Pelvic Joints and Ligaments Flashcards
What are the joints of the pelvis?
Sacroiliac, Sacrococcygeal and pubic symphysis
What type of joint is sacroiliac, what is it supported by?
Synovial joint (atypical) with fibrocartilage and jagged edges which help prevent movement. Very strong posterior ligaments and weak anterior. Ventral SI ligament - flat band, joins bones above and below pelvic brim. Posterior consists of interosseous SI and dorsal SI ligaments. Stability of sacroiliac joint is achieved through ligaments alone.
What type of joint is sacrococcygeal? What are its ligaments?
Symphysis with fibrocartilage. Short ventral SC ligament units bones at front, 2 dorsal SC ligaments posterior (deep and superficial). lateral SC ligaments from transverse process of coccyx to sacrum (completes foramen for anterior rami 5th sacral nerve)
What type of joint is the pubic symphysis?
Secondary cartilaginous joint. Each pube is covered with hyaline cartilage joined by mass of transverse fibres. Reinforced by superior pubic ligament above and arcuate pubic ligament below
Where does the sacrotuberous ligament run?
From posterior ilium between PSIS and PIIS to transverse tubercles of sacrum and upper transverse tubercles of coccyx. Continuation from this wide area to medial surface of ischial tuberosity.
Where does the sacrospinous ligament run?
Broad base at lower part of sacrum/upper coccyx. Narrows as passes laterally to spine of ischium.
What ligaments enclose the lesser sciatic foramen?
Sacrotuberous and sacrospinous
Where does the iliolumbar ligament run?
Shaped like V lying sideways. Apex is attached to transverse process of L5. Upper band passes to iliac crest and lower band runs lateral to blend with SI ligament