Upon examination of your patient's temporomandibular joint (TMJs), you observe the following amount of active range of motion (AROM): opening 55 mm; (L) lateral deviation 8 mm; (R) lateral deviation 8 mm; and protrusion 12 mm
Based on your knowledge of normal values of AROM of the TMJ, you would conclude that there is:
a. Less than expected opening and protrusion
b. Less than expected lateral deviation bilaterally
c. Greater than expected opening and protrusion
d. Excessive motion in all directions
ANS: C
Normal mouth opening is 40 to 50 mm; lateral deviation is 8 mm; protrusion is 6 to 9 mm. In the
case above, this would mean that the patient is demonstrating greater than normal opening and
protrusion.
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