Podcast
Questions and Answers
What occurs to the pelvic inlet when nutation occurs?
What occurs to the pelvic inlet when nutation occurs?
- It becomes irregular in shape
- It becomes larger (correct)
- It remains the same
- It becomes smaller
What type of tilt occurs with trunk extension?
What type of tilt occurs with trunk extension?
- Posterior tilt (correct)
- Nutation
- Anterior tilt
- Lateral tilt
Which muscle groups act as force couples to tilt the pelvis?
Which muscle groups act as force couples to tilt the pelvis?
- Spinal extensors and hip flexors
- Lumbar trunk extensors and hip abductors
- Abdominals and gluteus maximus
- Spinal flexors and hip extensors (correct)
What occurs to the pelvis during hip flexion in an open kinematic chain?
What occurs to the pelvis during hip flexion in an open kinematic chain?
What is the result of anterior pelvic tilt in a closed kinematic chain?
What is the result of anterior pelvic tilt in a closed kinematic chain?
Which of the following muscles pulls up anteriorly to tilt the pelvis posteriorly?
Which of the following muscles pulls up anteriorly to tilt the pelvis posteriorly?
What happens to the lumbar region of the vertebral column when a person with a hip flexion contracture stands in the upright position?
What happens to the lumbar region of the vertebral column when a person with a hip flexion contracture stands in the upright position?
What is the characteristic of a person with tight hamstrings when standing?
What is the characteristic of a person with tight hamstrings when standing?
What is the axis of rotation for lateral pelvic tilt?
What is the axis of rotation for lateral pelvic tilt?
What is the definition of left pelvic tilt?
What is the definition of left pelvic tilt?
What is the characteristic of pelvic shift?
What is the characteristic of pelvic shift?
What is the definition of forward rotation of the pelvis?
What is the definition of forward rotation of the pelvis?
What happens to the hip joint when the pelvis tilts anteriorly?
What happens to the hip joint when the pelvis tilts anteriorly?
What is the relationship between the two weight-bearing feet and the pelvis during pelvic shift?
What is the relationship between the two weight-bearing feet and the pelvis during pelvic shift?
During right forward rotation of the pelvis, what occurs at the left hip?
During right forward rotation of the pelvis, what occurs at the left hip?
What is the result of nutation on the pelvic outlet?
What is the result of nutation on the pelvic outlet?
Which muscle is involved in hip hiking?
Which muscle is involved in hip hiking?
During left backward rotation of the pelvis, what happens to the left ASIS?
During left backward rotation of the pelvis, what happens to the left ASIS?
What is the term for the movement of the pelvis on the weight-bearing hip joint?
What is the term for the movement of the pelvis on the weight-bearing hip joint?
What occurs during counternutation?
What occurs during counternutation?
What is the purpose of hip hiking during walking with a long leg cast or brace?
What is the purpose of hip hiking during walking with a long leg cast or brace?
Which of the following is a result of right backward rotation of the pelvis?
Which of the following is a result of right backward rotation of the pelvis?
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Study Notes
Pelvic Tilt
- Anterior pelvic tilt: lumbar portion of the vertebral column goes into hyperextension, while the hip joints flex.
- Posterior pelvic tilt: lumbar region becomes flattened, and hip joints extend.
Lateral Pelvic Tilt
- Lateral pelvic tilt is a frontal plane motion of the entire pelvis around an anteroposterior axis.
- In a normally aligned pelvis, a line through the anterior superior iliac spines is horizontal.
- In lateral tilt, one hip joint is the pivot point or axis for motion of the opposite side of the pelvis.
- Left pelvic tilt: right side of the pelvis is elevated higher than the left side.
- Right pelvic tilt: left side of the pelvis is elevated higher than the right side.
Lateral Shift of the Pelvis
- With pelvic shift, the pelvis cannot hike; it can only drop.
- Both hip joints will move in the frontal plane in a predictable way as the pelvic tilt (or pelvic shift) occurs.
Forward and Backward Rotation of the Pelvis
- Forward rotation of the pelvis: the non-weight bearing side is swinging forward, moving the ASIS of the non-weight bearing side forward.
- Backward rotation of the pelvis: the non-weight bearing side is swinging backward, moving the ASIS of the non-weight bearing side backward.
Nutation and Counternutation
- Nutation: occurs with trunk flexion, and the pelvic inlet becomes smaller.
- Counternutation: occurs with trunk extension, and the pelvic inlet becomes larger.
Muscle Control
- The pelvis is moved and controlled by groups of muscles acting as force couples.
- 4 primary muscle groups influencing pelvis position: spinal extensors, spinal flexors, hip extensors, and hip flexors.
Anterior and Posterior Tilt
- To tilt the pelvis anteriorly, the lumbar trunk extensors and hip flexors work together.
- To tilt the pelvis posteriorly, the abdominals and gluteus maximus and hamstrings work together.
Open and Closed Kinematic Chain
- Open chain: convex femur moves on concave acetabulum.
- Closed chain: concave acetabular surface moves on convex femur.
Hip Hiking
- Hip hiking: raising the pelvis on the unsupported side, assisted by the quadratus lumborum muscle.
- Useful in allowing some pressure relief during sitting and in walking with a long leg cast or brace.
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