7.3 Pelvic & hip joints Flashcards
What are the joints of the pelvis?
- Lumbosacral joint
- secondary cartilaginous IV joint
- synovial zagopophyseal joints
- Sacroiliac
- synovial joint
- b/w auricular surface of sacrum and ilium
- strong weight bearing joint
- Pubic symphyseal
- secondary cartilaginous between pubic bones (lined by hyaline cartilage, has fibrocartilaginous disc in b/w)
- Sacrococcygeal
- b/w sacrum and coccygeal
What are the ligaments of the lumbosacral joints?
- anterior longitudinal ligament
- lumbosacral ligament
- iliolumbar ligament
What happens with the curvature and dissipation of weight at the lumbosacral joint?
Lumbar lordosis turns into sacral kyphosis.
weight down the spine is anterior to spine, therefore there are anterior sheer forces acting at this joint
inferior articular facets (anterolateral) and S1 facets stop anterior displacement
S-shape of spine helps dissipate weight
Sacroiliac joint
between auricular surface of sacrum and ilium
early in life, hyaline cartilage lines this joint, but as you grow up, tuberosities form from this and come together to help lock joint
body’s weight as it comes down is transferred laterally to the head of the femur on each side
What are the ligaments of the sacroiliac joint?
- Interosseous ligament = within joint
- anterior/posterior ligament = hold joint together
Accessory ligaments
=**keep joint in place when weight is transferred upwards (ie. carrying heavy weight, jumping, sitting)
- iliolumbar ligament
- sacrospinous**
- sacrum → ischial spine
- converts lesser sciatic notch into lesser sciatic foramen (along with sacrotuberous)
- sacrotuberous**
- anterior-lateral sacrum → ischial tuberosity
- converts greater sciatic notch into greater sciatic foramen
What contributes to our locomotion pattern being efficient? (Ligaments are…)
non fatiguable structures!!