Notice the bi-concave shape of the disc, and it consistently stays between the condylar head and the articular eminence. When the mandible is closed, note that the joint is more down and forward as opposed to up and back, leaving room for the blood vessels and nerves posteriorly.
Anterior Disc Displacement With Reduction
In this case, you can see that the ligaments are more stretched out, leaving the disc anteriorly displaced on the condyle, so that when the jaw opens, it 'clicks' or 'pops' back in place, and the reciprocal 'click' occurs during closing.
Medially Displaced Disc
In this example, the disc displaces and reduces medio-laterally.
Degenerative Joint Disease with Perforation
This shows when the disc is perforated and thus positioned completely in front of the condyle. There is no longer that bi-concave shape, and you can notice the flattening of the condyle due to the continuous bony tissue contact with the eminence. Note also how the shape of the fossa has changed.
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For more information and to show how the Joint Vibration Analysis can detect these stages of internal derangement, Contact Nathan at 414-202-5430 or nathanr@bioresearchinc.com
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