Altered condylar morphology associated with disc displacement in TMJ dysfunction: observations by MRI

Area of Science:

• Temporomandibular joint (TMJ) disorders
• Orthodontics
• Radiology

Background:

• Internal derangement of the temporomandibular joint (TMJ) is a common condition.
• Understanding the relationship between TMJ bony morphology and internal derangement is crucial for diagnosis and treatment.
• Previous studies have explored TMJ disc abnormalities and their association with condylar changes.

Purpose of the Study:

• To analyze condylar shape and size in symptomatic TMJ patients.
• To correlate TMJ internal derangement with specific bony changes observed on MRI.
• To investigate the prevalence of regressive versus proliferative bony changes in TMJ internal derangement.

Main Methods:

• Retrospective analysis of magnetic resonance images (MRIs) from 276 TM joints in 138 symptomatic patients.
• Assessment of condylar morphology (shape and size) and internal derangement using MRI.
• Categorization of bony changes into regressive and proliferative types.

Main Results:

• Internal derangement was detected in 66% of analyzed TM joints via MRI.
• Regressive condylar changes (61%) were more prevalent than proliferative bony changes (39%) in TMJs with internal derangement.
• TM joints exhibiting regressive condyles showed no normal discs; altered bony morphology correlated with internal derangement severity.

Conclusions:

• Regressive bony remodeling is frequently associated with internal derangement of the TMJ.
• A strong correlation exists between TMJ disc abnormalities and regressive condylar changes.
• Further research is needed to elucidate the cause-and-effect relationship between condylar remodeling and TMJ disc pathology.