Background Knowledge of normal appearances of the temporomandibular joint (TMJ) is paramount when assessing the joint for disease in juvenile idiopathic arthritis. Reliable features defining normal TMJs in children are limited. Objective To establish reliable normal standards for the TMJ at magnetic resonance imaging (MRI). Materials and methods We included children and young adults aged 2–18 years undergoing a head MRI for reasons not believed to affect the TMJs. We assessed TMJ anatomy and contrast enhancement using a high-resolution 3-D T1-weighted sequence. We noted joint fluid and bone marrow oedema based on a T2-weighted sequence. Three experienced radiologists read all examina- tions twice in consensus and defined intraobserver consensus agreement. Results We evaluated the TMJs in 101 children and young adults (45 female), mean age 10.7 years (range 2–18 years). The intraobserver consensus agreement for the assessment of anterior condylar inclination in the sagittal/oblique plane was moderate to good (Cohen κ=0.7 for the right side). Cohen κ for intraobserver consensus agreement for condylar shape in the coronal plane on a 0–2 scale was 0.4 for the right and 0.6 for the left. Intraobserver agreement for measurement of joint space height and assessment of bone marrow oedema was poor. There
Pediatric Radiology – Springer Journals
Published: Dec 12, 2017
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