Spine Biomechanics and Spinal Orthotics Quiz

Study Notes

Spinal Orthotics

Spinal orthotics transfer load from the head and trunk to the pelvis, providing protection to the spinal cord.
The spine permits motion in three planes, allowing for flexibility and movement.

Spine Biomechanics

Vertebral bodies progressively increase in size from top to bottom, enabling them to sustain increasing superimposed weight.
The spine has three flexible curves, which contribute to its stability and flexibility.
Axial compression resistance of the spine is equal to the square of the number of curvature plus one, making it 10 times stronger than a straight column.

Stability of the Spine

Stability of the spine depends on the magnitude and direction of the load.
Intrinsic stability of the spine is provided by the intervertebral disc and surrounding ligaments.
Extrinsic stability is provided by the muscles, which work together to support the spine.

Function of Intervertbral Discs

Intervertbral discs bear and distribute loads, restraining excessive motion and providing stability to the spine.
Intradiscal pressure is 1.5 times the external load in compression, demonstrating the significant force that the discs can withstand.

Regional Movement and Stress

The interlocking nature of the spine restricts certain types of regional movement.
The lumbar disc is subject to stress, particularly when in a supported reclining position.

Description

Test your knowledge on how spinal orthotics transfer load from head & trunk to pelvis, protect the spinal cord, and permit motion in three planes. Learn about the progressive increase in size of vertebral bodies caudally to support higher weight, the importance of flexible curves, and how stability depends on loading magnitude and direction.