Diverse parameters have been developed to quantify spinal stability or system robustness. Kinematic variability (KV) has commonly been used based on the assumption that more robust systems will be able to more effectively reduce system variability. Some of these KV parameters include displacement, standard deviation, RMS area and path velocity of the center of mass (COM) or center of pressure (COP). In addition, stability diffusion analysis and Lyapunov exponents have been used to quantify stability, where lower diffusion or divergence rates indicate a more stable system.

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