What is the expected movement in the lumbar spine for neutral posture during sidebending?

In neutral posture during sidebending of the lumbar spine, free movement without resistance is the expected outcome. This is because the lumbar spine is designed to allow for lateral flexion while maintaining an overall neutral alignment. In this position, the spinal structures, including facets and intervertebral discs, provide a biomechanical environment that permits smooth and unrestricted movement.

When the lumbar spine is neutral, the ligaments and muscular attachments aren’t under tension in a way that would restrict motion, allowing the vertebrae to glide past one another freely. This is essential for maintaining flexibility and mobility in the lumbar region, which is crucial for daily activities and functional movements.

Other options suggest varying degrees of resistance that do not align with the principles of osteopathic biomechanics. Movement limitations or significant resistance are not characteristics of optimal sidebending at neutral, as the spine is physiologically capable of accommodating this motion without undue strain or restriction. Thus, the notion of free movement accurately reflects normal lumbar function during sidebending in a neutral position.