Arthrokinematics of the Pelvis
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Questions and Answers

What type of tilt occurs when the acetabulum moves on the femur with hip flexion?

  • Retroversion
  • Lateral tilt
  • Anterior tilt (correct)
  • Posterior tilt

Which movement occurs when the pelvis rotates around the anterior-posterior axis?

  • Anterior-posterior tilt (correct)
  • External-internal rotations
  • Abduction-adduction
  • Lateral tilts

What occurs in the sacrum during anteversion of the pelvis?

  • Rotation
  • Lateral tilt
  • Nutation
  • Counternutation (correct)

What type of movement occurs in the transverse plane during rotational movement of the pelvis?

<p>Rotation (C)</p> Signup and view all the answers

Which axis is associated with lateral tilt of the pelvis?

<p>Lateral axis (A)</p> Signup and view all the answers

What occurs in the lumbar spine during rotational movement of the pelvis?

<p>Rotation in the opposite sense (D)</p> Signup and view all the answers

What is associated with descending ASIS and ascending PSIS?

<p>Retroversion (C)</p> Signup and view all the answers

During gait, what occurs in the pelvis?

<p>Rotation to the opposite side of the stepping leg (D)</p> Signup and view all the answers

What is the primary purpose of the lumber multifidi muscle during load changes?

<p>To stabilize the SIJ (C)</p> Signup and view all the answers

During a closed kinetic chain, what is the primary movement of the femur in the hip joint?

<p>Flexion (D)</p> Signup and view all the answers

Which of the following muscles does NOT help to stabilize the SIJ?

<p>Psoas major (B)</p> Signup and view all the answers

What is the term for the combined movements of the hip, pelvis, and lumbar spine to increase overall motion?

<p>Lumbopelvic rhythm (B)</p> Signup and view all the answers

In which position is the SIJ in its close-packed position?

<p>Retroversion (A)</p> Signup and view all the answers

What is the term for the movements of the pelvis?

<p>Arthrokinematics of the pelvis (B)</p> Signup and view all the answers

Which of the following is NOT a primary movement of the pelvis?

<p>Elevation (D)</p> Signup and view all the answers

What is the term for the study of the movement of bones?

<p>Ostheokinematics (D)</p> Signup and view all the answers

What is the primary function of the anterior sacroiliac ligament?

<p>To stabilize the SI joint during load changes (C)</p> Signup and view all the answers

What is the main kinematic movement of the SI joint?

<p>Small rotational and translational movements (C)</p> Signup and view all the answers

What is the definition of nutation?

<p>Anterior tilt of the base of the sacrum (D)</p> Signup and view all the answers

Which of the following ligaments is considered a secondary stabilizer of the SI joint?

<p>Sacrotuberous ligament (C)</p> Signup and view all the answers

What is the main functional consideration of nutation and counternutation?

<p>To relieve joint stress (A)</p> Signup and view all the answers

What is the opposite movement of nutation?

<p>Counternutation (D)</p> Signup and view all the answers

What is the plane of movement for nutation and counternutation?

<p>Sagittal plane (B)</p> Signup and view all the answers

What is the approximate degree of rotation in the SI joint?

<p>1-4 degrees (C)</p> Signup and view all the answers

What type of joint is the sacrococcygeal joint?

<p>Symphysis (D)</p> Signup and view all the answers

What is the primary function of the pelvis in terms of weight transmission?

<p>To transmit the weight of the upper body and trunk to the ischial tuberosities or lower extremities (D)</p> Signup and view all the answers

What is the term for the union of the ilium, pubis, and ischium bones?

<p>Innominate (B)</p> Signup and view all the answers

What is the name of the joint that connects the right and left innominates anteriorly?

<p>Pubic symphysis (A)</p> Signup and view all the answers

What is the degree of freedom of the sacrococcygeal joint?

<p>One degree of freedom, flexion-extension (A)</p> Signup and view all the answers

What is the function of the pelvis in terms of supporting organs?

<p>To support the organs involved with bowel, bladder, and reproductive functions (D)</p> Signup and view all the answers

What is the name of the joint that connects the sacrum and the coccyx?

<p>Sacrococcygeal joint (D)</p> Signup and view all the answers

What is the term for the osteoligamentous ring formed by the connections of the right and left innominates?

<p>Pelvis (D)</p> Signup and view all the answers

Which muscles are responsible for anteversion of the pelvis?

<p>Iliopsoas, Rectus Femoris, Sartorius (C)</p> Signup and view all the answers

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?

<p>The pelvis is in a retroverted position, reducing the diameter of the pelvic outlet. (B)</p> Signup and view all the answers

Which muscles are responsible for lumbar extension and lumbar posterior chain?

<p>Erector Espinae, Trunk Extensors, Lumbar Extensors (A)</p> Signup and view all the answers

What type of interactions are responsible for movements in the 3 planes of the pelvis?

<p>Craniocaudal interactions (D)</p> Signup and view all the answers

Which muscles are responsible for retroversion of the pelvis?

<p>Gluteus Maximus, Hamstrings, Piriformis (A)</p> Signup and view all the answers

What is the term for the movement of the pelvis during the gait cycle?

<p>Combined lumbopelvic movements (C)</p> Signup and view all the answers

What is the main function of the muscles that stabilize the SI joint?

<p>To stabilize the pelvis during load changes (A)</p> Signup and view all the answers

Which of the following muscles are not responsible for stabilizing the SI joint?

<p>Biceps Brachii (C)</p> Signup and view all the answers

Flashcards

Anterior-posterior pelvic tilt (APT)

Hip flexion; posterior pelvic tilt (PPT): hip extension

Pelvic Abduction-Adduction

"Hip hike"

Pelvic External-Internal Rotation

Right pelvic rotation (Right leg internal rotation, Left leg external rotation)

Pelvic Anteversion

Anterior tilt, lateral axis (lumbosacral and coxal-femur), ASIS descent, PSIS ascent, sacrum counternutation.

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Pelvic Retroversion

Posterior tilt, lateral axis (lumbosacral and coxal-femur), ASIS ascent, PSIS descent, sacrum nutation.

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Lateral Pelvic Tilt

Lateral movement, frontal plane, AP axis, ASIS descent on one side, contralateral ASIS ascent.

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Pelvic Rotation

Rotational movement, transverse plane, superior-inferior axis, ASIS movement on one side, contralateral ASIS posterior movement.

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Pelvic Stability under Load

Pelvic movements release joint stress during activities like walking, running, or childbirth.

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Pelvic Retroversion and Stability

More congruence, sacrum in nutation, stability during load changes.

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SIJ Stabilizing Muscles

Erector spinae, lumbar multifidi, abdominal muscles, hip extensors, latissimus dorsi, iliacus, piriformis.

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Lumbopelvic Rhythm

Combined hip, pelvis, and lumbar spine movements for increased motion.

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Hip osteokinematics (WB)

Closed kinetic chain, during weight bearing.

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Innominate Bones

Ilium, pubis, and ischium; combined to form each side of the pelvis.

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Pelvic Functions

Attachment point for muscles, weight transfer, support for organs (bowels, bladder, reproductive).

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Sacrococcygeal Joint

Intrinsic Pelvic Joint, between sacrum and coccyx.

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Pubic Symphysis

Intrinsic Pelvic Joint, between pubic bones.

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Sacroiliac Joint (SIJ)

Intrinsic Pelvic Joint, between sacrum and ilium.

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Lumbosacral Joint

Extrinsic Pelvic Joint, between lumbar spine and sacrum.

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Acetabulofemoral Joint

Extrinsic Pelvic Joint, hip joint.

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Pelvic Stabilizing Muscles

Ilioposas, rectus femoris, sartorius, erector spinae, trunk extensors, gluteus maximus, hamstrings, piriformis, rectus abdominis, external oblique.

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Pelvic Stabilizers

Ligaments, muscles, and connective tissues.

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Pelvic Osteology

Complete osteoligamentous ring formed by the connections of the right and left innominates (ilium, pubis, and ischium).

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Pelvis Functional Anatomy

Intrinsic and extrinsic pelvic joints working together

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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

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Related Documents

Pelvic Biomechanics PDF

Description

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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