40 Questions
What type of tilt occurs when the acetabulum moves on the femur with hip flexion?
Anterior tilt
Which movement occurs when the pelvis rotates around the anterior-posterior axis?
Anterior-posterior tilt
What occurs in the sacrum during anteversion of the pelvis?
Counternutation
What type of movement occurs in the transverse plane during rotational movement of the pelvis?
Rotation
Which axis is associated with lateral tilt of the pelvis?
Lateral axis
What occurs in the lumbar spine during rotational movement of the pelvis?
Rotation in the opposite sense
What is associated with descending ASIS and ascending PSIS?
Retroversion
During gait, what occurs in the pelvis?
Rotation to the opposite side of the stepping leg
What is the primary purpose of the lumber multifidi muscle during load changes?
To stabilize the SIJ
During a closed kinetic chain, what is the primary movement of the femur in the hip joint?
Flexion
Which of the following muscles does NOT help to stabilize the SIJ?
Psoas major
What is the term for the combined movements of the hip, pelvis, and lumbar spine to increase overall motion?
Lumbopelvic rhythm
In which position is the SIJ in its close-packed position?
Retroversion
What is the term for the movements of the pelvis?
Arthrokinematics of the pelvis
Which of the following is NOT a primary movement of the pelvis?
Elevation
What is the term for the study of the movement of bones?
Ostheokinematics
What is the primary function of the anterior sacroiliac ligament?
To stabilize the SI joint during load changes
What is the main kinematic movement of the SI joint?
Small rotational and translational movements
What is the definition of nutation?
Anterior tilt of the base of the sacrum
Which of the following ligaments is considered a secondary stabilizer of the SI joint?
Sacrotuberous ligament
What is the main functional consideration of nutation and counternutation?
To relieve joint stress
What is the opposite movement of nutation?
Counternutation
What is the plane of movement for nutation and counternutation?
Sagittal plane
What is the approximate degree of rotation in the SI joint?
1-4 degrees
What type of joint is the sacrococcygeal joint?
Symphysis
What is the primary function of the pelvis in terms of weight transmission?
To transmit the weight of the upper body and trunk to the ischial tuberosities or lower extremities
What is the term for the union of the ilium, pubis, and ischium bones?
Innominate
What is the name of the joint that connects the right and left innominates anteriorly?
Pubic symphysis
What is the degree of freedom of the sacrococcygeal joint?
One degree of freedom, flexion-extension
What is the function of the pelvis in terms of supporting organs?
To support the organs involved with bowel, bladder, and reproductive functions
What is the name of the joint that connects the sacrum and the coccyx?
Sacrococcygeal joint
What is the term for the osteoligamentous ring formed by the connections of the right and left innominates?
Pelvis
Which muscles are responsible for anteversion of the pelvis?
Iliopsoas, Rectus Femoris, Sartorius
What is the main reason why lying supine is potentially the most difficult position for the baby to go through the pelvic outlet during childbirth?
The pelvis is in a retroverted position, reducing the diameter of the pelvic outlet.
Which muscles are responsible for lumbar extension and lumbar posterior chain?
Erector Espinae, Trunk Extensors, Lumbar Extensors
What type of interactions are responsible for movements in the 3 planes of the pelvis?
Craniocaudal interactions
Which muscles are responsible for retroversion of the pelvis?
Gluteus Maximus, Hamstrings, Piriformis
What is the term for the movement of the pelvis during the gait cycle?
Combined lumbopelvic movements
What is the main function of the muscles that stabilize the SI joint?
To stabilize the pelvis during load changes
Which of the following muscles are not responsible for stabilizing the SI joint?
Biceps Brachii
Study Notes
Pelvic Movements
- Anterior-posterior pelvic tilt (APT): hip flexion; posterior pelvic tilt (PPT): hip extension
- Abduction-adduction: "hip hike"
- External-internal rotations: right pelvic rotation (R leg IR, L leg ER)
Arthrokinematics of the Pelvis
- Anteversion: anterior tilt, lateral axis (lumbosacral and coxal-femur), descent of ASIS, ascent of PSIS, sacrum counternutation, associated with lumbar hypelordosis and lumbar extension movement
- Retroversion: posterior tilt, lateral axis (lumbosacral and coxal-femur), ascent of ASIS, descent of PSIS, sacrum nutation, associated with lumbar kyphosis and lumbar flexion movement
Osteokinematics of the Pelvis
- Lateral tilt: lateral movement, frontal plane, AP axis (between lumbosacral and coxal-femoral), descent of ASIS from one side, ascent of contralateral ASIS, associated with movements of abduction and adduction
- Rotation: rotational movement, transverse plane, superior-inferior axis, anterior movement of ASIS of one side, posterior movement of contralateral ASIS, associated with movements during gait
Stability during Load Changes
- When we walk, run, or give birth, there is high mechanical stress on the pelvis, and the pelvis generates movements to release joint stress
- Pelvis in retroversion: more congruence, sacrum in nutation, stability during load changes
- Muscles that reinforce and stabilize the SIJ: erector spinae, lumbar multifidi, abdominal muscles, hip extensor muscles, latissimus dorsi, iliacus, and piriformis
Lumbopelvic Rhythm
- Combined and coordinated movements of hip, pelvis, and lumbar spine to increase overall motion
- Osteokinematics of the hip: closed kinetic chain (WB), pelvic biomechanics
Osteology of the Pelvis
- Each innominate is the union of three bones: ilium, pubis, and ischium
- The pelvis is a complete osteoligamentous ring, formed by the connections of the right and left innominates
- Functions of the pelvis: attachment point for muscles, transmits weight of the upper body, and supports organs involved in bowel, bladder, and reproductive functions
Functional Anatomy of the Pelvis
- Intrinsic joints of the pelvis: sacrococcygeal joint, pubic symphysis, and sacroiliac joint
- Extrinsic joints of the pelvis: lumbosacral joint and acetabulofemoral joint
Kinetics and Stabilizers
- Muscles that act in pelvic movements: ilopsoas, rectus femoris, sartorius, erector spinae, trunk extensors, gluteus maximus, hamstrings, piriformis, rectus abdominis, and external oblique
- Stabilizers of the pelvis: ligaments, muscles, and connective tissues
This quiz covers the movements of the pelvis, including anterior-posterior pelvic tilt, abduction-adduction, and external-internal rotations. It also touches on anteversion and associated movements of the lumbar spine.
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