Diagnostic accuracy on fat-saturatedT₂weighted MRI for diagnosis of intra-articular adhesions of the temporomandibular joint

Abstract

Objective: The purpose of this study is to compare intra-articular adhesions of the temporomandibular joint (TMJ) between fat-saturated T 2 weighted MR images and arthroscopic findings. Methods: 50 patients (50 joints) with closed locking of the TMJ who were examined with MRI and then underwent arthroscopic surgery participated in this study. The concordance rate of intra-articular adhesions between fat-saturated T 2 weighted MR images and arthroscopic findings was studied using the kappa coefficient. Results: Intra-articular adhesions were seen on MRI in 21 joints (42%) and in arthroscopic findings in 26 joints (52%). Thus, five joints had false-negative results and mild adhesions were arthroscopically observed in these five joints. There was significant concordance between these two findings (p , 0.001). The kappa coefficient was 0.801, which was considered to be complete concordance. Conclusions: On fat-saturated MRI, a low signal intensity area and narrowing image in the joint space of the TMJ may indicate the presence of intra-articular adhesions or fibrosis.

MRI of Temporomandibular Joint Disorders: Recent Advances and Future Directions

“…Additionally, intra-articular adhesions or fibrosis can be detected as a low signal intensity area and narrowing image in the joint space on fat-saturated T 2 WI. 29 Apart from static imaging, the conventional MRI protocol of TMD may contain pseudo-dynamic MRI at some institutions, which is composed of serial static images from stepwise mouth opening by using adjuvant devices to better visualize the consecutive disc and mandibular condyle movement of the TMJ and help in the diagnosis of TMJ abnormalities. [30][31][32] Recent MRI Advances A summary of recent advanced MRI techniques in TMD is shown in Table 1.…”

“…3). Additionally, intra‐articular adhesions or fibrosis can be detected as a low signal intensity area and narrowing image in the joint space on fat‐saturated T 2 WI 29 …”