[Magnetic resonance arthrography for the diagnosis of intraarticular adhesions of TMJ adhesions].
OBJECTIVE
To evaluate the value of magnetic resonance arthrography (MRAr) on the diagnosis of intraarticular adhesions of the temporomandibular joint(TMJ).


METHODS
30 consecutive patients (31 TMJs) diagnosed as internal derangement of TMJ were examined by MRAr and arthroscopy. The findings of interpreting MRAr were recorded as positive, suspicious and negative according to the MRAr radiographic criteria. After comparing the findings of MRAr with those of arthroscopy, the numbers of true positive, true negative,false positive and false negative were obtained. Through SPSS11.0, receiver operator characteristic curve(ROC curve) was made, and the area under the ROC curve was calculated. According to the area, the diagnostic accuracy of MRAr was evaluated.


RESULTS
Surgery results confirmed that 22 TMJs in 31 TMJs had adhesions. According to the above criteria, we found 20 TMJs were positive, 3 TMJs were suspicious, and 8 TMJs were negative. After comparing the findings of MRI with those of arthroscopy, true positive in 19 TMJs and false positive in 1 TMJs were detected among 20 positive TMJs, adhesion in 2 TMJs and no adhesion in 1 TMJs were detected among 3 suspicious TMJs, and true negative in 7 TMJs and false negative in 1 TMJs were detected among 8 negative TMJs. The area under ROC curve was 0.91(0.86,0.95), P<0.05.


CONCLUSIONS
It is concluded that: (1)The diagnostic accuracy of MRAr is excellent, much better than that of PFA and MRI. (2) MRAr is an ideal method to diagnose intraarticular adhesions of TMJ.
Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, Shanghai Second Medical University, Shanghai 200011, China.
Shan-Yong
SY
Zhang
Chi
C
Yang
Xu-Dong
XD
Wang
Xin-Dong
XD
Fan
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000473:pathology; D000267:Tissue Adhesions / Q000175:diagnosis