In Fryette's third law, what happens to motion in one plane when motion is initiated in another plane?

Fryette's third law states that when motion is initiated in one plane, it restricts motion in other planes. This concept highlights the interdependence of spinal motion, particularly in the context of vertebral mechanics. When a segment of the spine is moved in one plane (for example, flexion or extension), it limits the ability of that segment to move in the other two planes (rotation and side bending).

The rationale behind this law is rooted in the biomechanical properties of the spine. The vertebrae are interconnected, and any movement affects the overall alignment and stability of the spinal column. By initiating motion in one direction, the surrounding structures, including muscles and ligaments, are also engaged, which can lead to restrictions in other available movements due to the constraints of the system.

Understanding this principle is essential for clinicians when assessing and treating spinal dysfunctions, as it informs their approach to manual therapy and rehabilitation strategies. This law emphasizes the importance of addressing multiple planes of motion during evaluation and treatment to ensure comprehensive care for the patient.