Abstract
ObjectiveTo assess changes in the articular surfaces of the temporomandibular joint (TMJ) and in condylar translation, as detected by magnetic resonance imaging (MRI), determining whether such changes correlate with disc displacement.Materials and MethodsWe retrospectively analyzed the MRI scans of 2076 TMJs of 1038 patients with symptoms of temporomandibular disorder. We attempted to determine whether articular disc deformity and changes in condylar translation, as well as changes in the articular surfaces of the condyle, glenoid fossa, and articular eminence, correlated with disc displacement.ResultsDisc displacement with reduction was associated with changes in the shape of the articular eminence. Disc displacement without reduction was most strongly associated with disc deformity, condylar degeneration, glenoid fossa degeneration, and effusion. Neither decreases nor increases in condylar translation were associated with disc deformity, degenerative bone changes, or disc displacement.ConclusionChanges in the shape of the articular eminence seem to predispose to progression of internal derangement of the TMJ.
Highlights
Temporomandibular disorders (TMDs) are the leading cause of maxillofacial pain, involving changes in the masticatory muscles and internal derangement of the temporomandibular joint (TMJ)
The associations of disc displacement with reduction (DDWR), disc displacement without reduction (DDWoR), and posterior disc displacement with the variables disc deformity, bone changes, and effusion are presented in Tables 1, 2, and 3, respectively
magnetic resonance imaging (MRI) is the best method for diagnosing TMD; in addition to providing excellent routine static images, it has the ability to analyze disc position and condylar excursion throughout the dynamic process of mouth opening and closing by obtaining multiple static images in series[2,21]
Summary
Temporomandibular disorders (TMDs) are the leading cause of maxillofacial pain, involving changes in the masticatory muscles and internal derangement of the temporomandibular joint (TMJ). Internal derangement is an abnormal relationship between the articular disc, condyle, glenoid fossa, and articular eminence[1,2,3]. Anterior disc displacement is the most common disorder in patients with. Lateral disc displacement, and medial disc displacement have been described only rarely in the literature[1,4]. It has been suggested that progression of disc displacement leads to degenerative changes in the disc itself and in the articular surfaces[1,5,6,7], such changes presenting as radiological signs of osteoarthritis. Some authors have suggested that the anatomy of the eminence may predispose
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