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Figure 5

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Examples of recordings from the accelerometers. A: Recording showing a cavitation. B: The time scale of the cavitation is expanded to show when each accelerometer first recorded a vibration. This information was used in an algorithm with previously measured distances between the accelerometers to determine the location of the cavitation with respect to the 3 accelerometers. This distance information was then compared with distances between the SPs and Z joints measured from the MRI scans to determine the Z joint(s) that cavitated (cross reference with Table 3). This cavitation occurred at the L4/L5 vertebral level.