Facet joints and intervertebral discs bear what percentage of shear and torsional load?

Facet joints and intervertebral discs play a crucial role in bearing the mechanical loads placed on the spine during various movements. Shear load refers to forces that cause one part of the spine to slide past another, while torsional load relates to twisting forces. Research indicates that these structures collectively handle approximately 80% of the shear and torsional loads during dynamic activities, contributing significantly to the overall stability and function of the spine.

This understanding is vital for physical therapy and rehabilitation contexts, as it highlights the importance of maintaining the health and integrity of the facet joints and intervertebral discs in preventing injuries and managing conditions like back pain. Recognizing this load distribution can also inform clinical decisions regarding exercise, posture, and interventions aimed at enhancing spinal health.