24/06/2025
📌 Common Movement Strategy Anterior and Posterior pelvic tilt
The movement strategy, e.g., coupled lumbar flexion and anterior pelvic rotation, illustrates the most commonly used strategy for bending, lifting, and reaching activities.
The strategy of combining movements of the spine and pelvis appears to maximize the range of motion.
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🔄 Alternative Strategy
It is possible to implement a different strategy that utilizes primarily pelvic control, i.e., anterior or posterior tilt.
This creates apparent paradoxical lumbar movements compared to the movement pattern just described above.
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📉 Less Common but Illustrative
The sequence of movements described are not typically observed in normal daily activities.
They are presented as an example of an alternative illustration of the coupling dynamics of the hip joint, pelvis, and lumbar spine.
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🦴 Anterior Pelvic Rotation Mechanism
Activation of the erector spinae and hip flexors (primarily iliopsoas) creates a force couple.
This anteriorly rotates the pelvis and accentuates lumbar lordosis (i.e., increases lumbar extension).
The approximate axis of rotation is through both hip joints.
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⚠️ Consequences of Increased Lordosis
Accentuation of lumbar lordosis:
Decreases the diameter of the intervertebral foramen.
Places lumbar segments in a more extreme extension position.
Increases the closed-packed position of the facet joints.
Elevates joint surface compression loads.
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📚 Disc and Annulus Effects
Increased compression of the posterior IVD causes the posterior annulus to buckle.
This forces the nucleus pulposus anteriorly, inducing annular bulging.
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🔁 Posterior Pelvic Tilt Mechanism
Posterior tilting of the pelvis is induced by:
Coupling of the abdominal muscles (primarily re**us abdominis and external obliques).
Hip extensors (gluteus maximus and hamstrings).
This reverses the effect on the lumbar spinal segments.
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