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Temporomandibular Joint Disk Displacement: Comparison in Asymptomatic Volunteers and Patients1

Tore A. Larheim, DDS, PhD, Per-Lennart Westesson, MD, PhD, DDS and Tsukasa Sano, DDS, PhD

1 From the Eastman Dental Center, Rochester, NY, and the Department of Maxillofacial Radiology, Faculty of Dentistry, University of Oslo, PO Box 1109, Blindern, 0317 Oslo, Norway (T.A.L.); the Department of Radiology, Division of Neuroradiology, University of Rochester School of Medicine and Dentistry, NY (P.L.W.); and the Department of Oral Radiology, Showa University School of Dentistry, Tokyo, Japan (T.S.). Received January 18, 2000; revision requested March 15; revision received June 22; accepted July 14. T.A.L. supported by the Research Council of Norway. P.L.W. supported by National Institutes of Health grant number 8053. Address correspondence to T.A.L. (e-mail: larheim@odont.uio.no).



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  		Figure 1. Oblique sagittal MR images (2,000/20) of the TMJ of a patient show complete anterior displacement of the disk with the mouth closed in A and B and open in C and D. The disk is anteriorly displaced in all portions of the joint: A and C, lateral; B, central; and D, medial. Arrow indicates the posterior band of the disk.

 


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  		Figure 2. Oblique sagittal MR images (2,000/20) of the TMJ of a volunteer show partial anterior displacement of the disk with the mouth closed in A and B and show the normal position of the disk with the mouth open in C. A, The disk is anteriorly displaced in the lateral portion of the joint. B, The disk is in the normal position in the medial portion of the joint. With mouth opening, the disk position normalizes, which indicate disk displacement with reduction. Arrow indicates the posterior band of the disk.

 


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  		Figure 3. Oblique sagittal MR images (2,000/20) of the TMJ in a volunteer show the normal superior position of the disk with a closed mouth in all portions of the joint: A, lateral and B, centromedial. Arrow indicates the posterior band of the disk.

 




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