Abstract
Purpose
To assess pattern of articular disc displacement in patients with internal derangement (ID) of temporomandibular joint (TMJ) with ultrasound.
Materials and methods
Prospective study was conducted upon 40 TMJ of 20 patients (3 male, 17 female with mean age of 26.1 years) with ID of TMJ. They underwent high-resolution ultrasound and MR imaging of TMJ. The MR images were used as the gold standard for calculating sensitivity, specificity, accuracy, positive predictive value (PPV), negative predictive value (NPV), positive likelihood ratio (PLR), and negative likelihood ratio (NLR) of ultrasound for diagnosis of anterior or sideway displacement of the disc.
Results
The anterior displaced disc was seen in 26 joints at MR and 22 joints at ultrasound. The diagnostic efficacy of ultrasound for anterior displacement has sensitivity of 79.3 %, specificity of 72.7 %, accuracy of 77.5 %, PPV of 88.5 %, NPV of 57.1 %, PLR of 2.9 and NLR of 0.34. The sideway displacement of disc was seen in four joints at MR and three joints at ultrasound. The diagnostic efficacy of ultrasound for sideway displacement has a sensitivity of 75 %, specificity of 63.6 %, accuracy of 66.7 %, PPV of 42.8, NPV of 87.5 %, PLR of 2.06, and NLR of 0.39.
Conclusion
We concluded that ultrasound is a non-invasive imaging modality used for assessment of anterior and sideway displacement of the articular disc in patients with ID of TMJ.
Riassunto
Scopo
Valutare i pattern della dislocazione del disco articolare nei pazienti con squilibrio interno (ID) dell’articolazione temporo-mandibolare (ATM) con l’ecografia.
Materiale e metodi
E’ stato condotto uno studio prospettico su 40 ATM di 20 pazienti (3 maschi, 17 femmine, con età media di 26,1 anni) con ID della TMJ. Tutti sono stati sottoposti ad ecografia ad alta risoluzione e RM della TMJ. La RM è stati utilizzata come il gold standard per il calcolo di sensibilità, specificità, accuratezza, valore predittivo positivo (PPV), valore predittivo negativo (NPV), rapporto di probabilità positivo (PLR) e rapporto di probabilità negativo (NLR) dell’ecografia nella la diagnosi di dislocazione anteriore o lateralmente del disco.
Risultati
Il disco appariva dislocato anteriormente in 26 ATM con la MR e in 22 con l’ecografia. L’efficacia diagnostica dell’ecografia nella diagnosi di dislocazione anteriore aveva sensibilità del 79,3 %, specificità del 72,7 %, accuratezza del 77,5 %, valore predittivo positivo del 88,5 %, NPV di 57,1 %, PLR di 2,9 e NLR di 0,34. Il dislocamento laterale del disco è stata osservato in 4 casi con MR e 3 con ecografia. L’efficacia diagnostica dell’ecografia per lo spostamento laterale aveva sensibilità del 75 %, specificità del 63,6 %, accuratezza del 66,7 %, PPV di 42,8, NPV di 87,5 %, PLR di 2.06 e NLR di 0,39.
Conclusioni
Abbiamo concluso che l’ecografia è una metodica di imaging non invasiva che può essere utilizzata per la valutazione delle dislocazioni anteriori e laterali del disco articolare nei pazienti con ID di TMJ.
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Conflict of interest
The authors (Abdel Razek A, Al Belasy F, Ahmed W, Haggag M) have no conflict of interest.
Informed consent
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000 (5). All patients provided written informed consent to enrolment in the study and to the inclusion in this article of information that could potentially lead to their identification.
Human and animal studies
The study conducted in accordance with all institutional and national guidelines for the care and use of laboratory animals.
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Razek, A.A.K.A., Al Mahdy Al Belasy, F., Ahmed, W.M.S. et al. Assessment of articular disc displacement of temporomandibular joint with ultrasound. J Ultrasound 18, 159–163 (2015). https://doi.org/10.1007/s40477-014-0133-2
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DOI: https://doi.org/10.1007/s40477-014-0133-2