Study of the Accuracy of High-Resolution Ultrasound in the Diagnosis of TMJ Disc Displacement in Comparison With MRI

Abstract

The temporomandibular joint disorders (TMD) have been a major source of pathology. Being only second to chronic low back pain as a cause of pain and disability. MRI is currently considered the gold standard method for imaging of the TMJ. USG is a non-invasive, inexpensive procedure. And can provide a potential sensitive tool for diagnosis of anterior disc displacement. Aim of the work: The aim of this study is to compare between the accuracy of ultrasound and MRI in diagnosis of TMJ disc displacement. Patients and Methods: This study was carried out at the Radiology Department, Ain Shams University Hospitals. Twenty one patients with clinically suspected TMJ disc displacement underwent ultrasound (US) and MRI examination. Results: The overall sensitivity of the US to diagnose disc displacement compared to MRI reached (94.7%), specificity (91.3%), Positive Predictive value (90.0%), Negative Predictive Value (95%) and accuracy (92.9%). The results indicated 1.8 mm was the most accurate cut-off distance between the articular capsule and the anterior surface of the mandibular condyle for diagnosis of MR positive disc displacement.