Analysis of magnetic resonance imaging of 171 patients with synovial chondromatosis in the temporomandibular joint

doi:10.19438/j.cjoms.2017.01.004

Abstract

Abstract: PURPOSE: To evaluate the classification and potential aggressive behavior of temporomandibular joint (TMJ) synovial chondromatosis(SC) on magnetic resonance imaging by analyzing its MRI characteristics. METHODS: MRI data of 171 patients who suffered from synovial chondromatosis of TMJ treated in our hospital during April 2004 to December 2015 were collected. On the basis of MRI findings, there were three categories: type of loose body, type of homogeneous mass and type of mixture of both loose body and homogeneous mass. The MRI findings of bony erosion included 4 stages: without erosion, chondral destruction, bony absorption and bony perforation. The relationship between categories and bony erosion and the differences between bony erosion on MRI and surgical findings were analyzed. Chi-square test or Fisher's exact test was performed using SAS 16.2 software package. RESULTS: Type of loose body include 55 cases (32.16%), type of homogeneous mass include 84 cases (49.12%) and type of mixture include 32 cases (18.71%). According to surgical findings, 70 cases (40.94%) had bony erosion; however, MRI could not distinguish the stage of chondral destruction. Among 14 cases with bony perforation, 11 (78.57%) belonged to the type of homogeneous mass, 3 (21.43%) belonged to the type of mixture; compared to the stage without erosion, there was significant difference (P=0.009). Among all patients, 2 had recurrence. CONCLUSIONS: Synovial chondromatosis with the type of homogeneous mass and type of mixture on MRI were more aggressive. Patients with these types needs synovium removal, even partial osteotomy.

Key words: Synovial chondromatosis, Temporomandibular joint, MRI, Classification, Bony erosion

CLC Number:

R782.6

HAN Zi-xiang, CHEN Min-jie, YANG Chi, WEI Wen-bin, SHI Hui-min. Analysis of magnetic resonance imaging of 171 patients with synovial chondromatosis in the temporomandibular joint[J]. China Journal of Oral and Maxillofacial Surgery, 2017, 15(1): 16-19.

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