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Figure 2

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Theoretical mechanism of cavitation (joint sound) production. A = Posterior view of zygapophysial (Z) joints (right Z joint in box). B = Parasagittal section of Z joint showing Z joint synovial folds. C = Z joint adhesions developing in hypomobile joint. D = Therapeutic gapping (separation) of Z joint articulating facets breaking up adhesions while a cavitation (pop) is created.