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(a) Lateral radiographic of a healthy spine, indicating a healthy C5-C6 facet joint. A tip-mounted transducer has been inserted in the superior articular facet to measure the contact pressure developed in the facet joint during experimental studies inducing spinal bending. (b) A photograph of the facet surface of an exposed C5 facet from a 65 year old male donor demonstrating hallmarks of a degenerated articular surface: fissure (single arrow) and eroded cartilage area (double arrow).
