1740 Correlation of the coronal form of condyle and disc on MR imaging
M.Q. WANG, T. SHIBATA, and Y. ZHANG, Stomatological College, Fourth MIlitary Medical University, Xi'an, China

TMJ condyle has a vast variety in form. How about disc? The present study was conducted to invest the relationship of the form of condyle and disc. Materials and Methods: Bilateral TMJ of 78 TMD patients were examined with MRI (TR 2000, TE 16, THK 3.0) and the coronal MR imagines were studied focused on coronal form of condyles and discs following double blinding principle. Results: 1. The condyle form could be divided into four types. Type A, the condyle showed as a shuttle, both of the lateral and medial poles projected significantly. Type B, irregular round, one or both of the poles disappeared and the lateral-medial dimension was short to be as the condyle height. Type C, the medi-form of Type A and Type B. Type D, the condyle run upward obliquely from lateral to medial, with medial pole seated upmost. The discs could be divided into four types too. Type I, a very thin line between the cartilage images of condyle and fossa. Type II, no disc image could be found. Type III, disc imagined thick totally or locally. Type IV, dollop form of disc at or below the lateral or medial pole of condyle. Type IV disk is a kind of disc that used to be diagnosed as disc side displacement. The forms of condyle and disc had a close relationship with each other (x2=48.84, p<0.01). Type A (shuttle) condyle was more frequently found with Type I (26/78) or Type III (36/78) disc while the irregular condyle (Type C) with more dollop disc Type IV (16/21). Conclusion: The disc form had a close relationship with that of condyle. It may have influence on TMJ diagnosis. Supported by Foundation for University Key Teacher by the Ministry of Education of China.

Seq #166 - TMJ - Structure and Function I
9:00 AM-11:00 AM, Friday, 8 March 2002 San Diego Convention Center Room 16A (Mezzanine Level)

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