Exam 3: Pelvis and Hip Flashcards
3 pelvic joints
2 SI joints
Pubic symphysis
SI joints are _____ joints important to statics and dynamics of posture and gait
Mobile synovial
Pelvic joints functions
- Support for trunk
- Guide movement
- Absorb compressive forces
Interlocking elevations and depressions produces ____ of sacrum
Keystone effect
Keystone effect effectively distributes
Axial compressive forces
Forces from LE divide
Up toward spine
Ant to pubic symphysis
Downward forces of gravity on spine split to
Both sides
Sacrum is triangular and serves as a ____ in the arch btw 2 “columns” (LE)
Keystone
SI joints at birth
Undeveloped
Smooth
Flat
When do SI joints take on adult characteristics
After ambulation starts
SI joints in teen years begin to
Roughen
Develop grooves and ridges
In later years a high % of patients will have
Interarticular adhesions
Loss of motion
Ligamentous stability of the pelvis
Posterior SI ligs
Sacrotuberous lig
Anterior SI lig
Sacrospinous lig
Posterior SI ligaments connects the sacrum to the
Iliac tuberosity and posterosuperior iliac spine (PSIS)
Posterior SI ligs continue laterally w/ the ____ and medially w/ the ____
Sacrotuberous lig; thoracolumbar fascia
Sacrotuberous lig continues caudally w/ the
Tendon of long head of biceps femoris
SI joint most active during
Locomotion
As the left innominate moves posterior/inferior, the left sacral base moves ____
Anterior and inferior (nutation)
As the right innominate moves anterior/superior the sacral base moves
Posterior/superior (counternutation)
What muscles cross the Si joint
NONE
Muscles around the Si joint provide
Stability NOT mobility
Pelvis subluxations
AS or PI
In or Ex
Sacral subluxations
Apex L or R
Base Posterior (-thetaX)
Apex posterior (+thetaX)
L/R posteriority
Sacrum subluxation: left posterior
+thetaY
