Neutral zone of a spinal segment depicted as a bowl, with the sides of the bowl representing the osteoligamentous tissues and the moving ball
representing the segmental mobility. (A) In a deep bowl, when perturbations disturb the ball, there is little motion as the ball rolls back and forth and settles
in the center of the bowl—representing stability. (B) In a shallow bowl, there is greater motion—representing greater segmental mobility or instability. (C)
Viewing the bowl from above, bungee cords attached to the ball and the sides of the bowl represent the dynamic function of segmental muscles.
Appropriately graded tension in the bungee cords stabilizes the ball when perturbations disturb the unit.
Source: The Spine: Management Guidelines, Therapeutic Exercise: Foundations and Techniques, 6e
Citation: Kisner C, Colby L. Therapeutic Exercise: Foundations and Techniques, 6e; 2012 Available at: http://mhmedical.com/ Accessed: July
12, 2017
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