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Figure 7

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Gapping Differences of SMT (up-side) vs. non-SMT (down-side) Z joints. The Gapping Difference for each Z joint was calculated as: (A-P measurement from 2nd MRI) – (A-P measurement from 1st MRI). A positive value indicated an increase in gapping following SMT. The SMT (up-side) joints showed more gapping than the non-SMT (down-side) joints. Notice the scale on the Y-axis includes negative values to accommodate the negative gapping difference of the down-side joints.