Pelvic and SI Dysfunction Flashcards
3 Functions of the SI joint
- Transfer load from trunk to legs
- Absorb LE motion/forces
- Dissipate force before it reaches the L-spine
3 Parts of the Osseous ring
- Ilium
- Sacrum
- Pubis
Term: Inter-related movement between the lumbar and pelvic joints
Lumbopelvic rhythm
Term: L4-S1
Lumbosacral Junction
Facets L5-S1
- Orientation
- Function
- Coupling
- Frontal/Caudal (the rest of the L-spine in sagittal plane)
- WB (on base of sacrum)
- SAME direction
Structure: Attached from L4/L5 TP to iliac crest and restricts lumbopelvic motion
Iliolumbar ligament
Portion of Iliolumbar Ligament: Tight with flexion
Posterior
Portion of Iliolumbar Ligament: Tight with extension
Anterior
Portion of Iliolumbar Ligament: Tight with rotation and SB
Superior
Structure: Blends into quadratus lumborum
Iliolumbar ligament
2 Features that add stability to the sacrum
- Triangle shape
- Ridges and depressions
Joint Type: Anterior SI joint
Diarthrodial (synovial)
Joint type: Posterior SI Joint
Syndesmosis
2 Types of articulating surfaces in the SI joint
- Sacral surface covered in hyaline cartilage
- Iliac surface covered in fibrocartilage
4 Characteristics providing stabilty to the SI Joint
- 2 joint types in one capsule
- 2 types of cartilage prevent gliding
- Irregular joint surfaces add friction
- Extensive ligaments surrounding joint
Structure: Sacral surface/vertical plane level with S1
Short Arm of the Sacrum
Structure: sacral surface/AP plane level with S2 to S4
Long Arm of the Sacrum
Term: Sacrum moving on ilium
Sacroiliac motion
Term: Innominate moving on the sacrum
Iliosacral motion
Term: Innominate
Ilium
Term: Lumbar motion
Sacroiliac motion
Term: Flexion of the sacrum
Nutation
Term: Sacrum moving anterior and inferior
Nutation
Term: Extension of the sacrum
Counternutation
Term: Sacrum moving superior and posterior
Counternutation