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Condylar movements in clicking joints before and after arthrography
F A Rohrer1, S Palla, W Engelke
1Disorders and Complete Dentures, University of Zürich, Switzerland.
Journal of Oral Rehabilitation
|March 1, 1991
Summary
Arthrography slightly shifts temporomandibular joint (TMJ) biomechanics, delaying opening clicks. However, these changes do not invalidate TMJ arthrographic diagnoses for anterior disc displacement with reduction.
Area of Science:
- Temporomandibular Joint (TMJ) Disorders
- Biomechanics
- Diagnostic Imaging
Background:
- Anterior disc displacement with reduction is a common TMJ disorder.
- Arthrography is a diagnostic tool used to assess TMJ internal derangements.
- The influence of anesthesia and contrast medium on TMJ biomechanics during arthrography is not fully understood.
Purpose of the Study:
- To investigate the effects of anesthesia and contrast medium injection on TMJ biomechanics.
- To determine if these alterations influence arthrographic diagnosis in patients with anterior disc displacement with reduction.
Main Methods:
- Opto-electronic motion recording (Jaws 3D) was used to track condylar point trajectories during opening and closing movements.
- Measurements were taken before anesthesia, after anesthesia, and after arthrography in nine patients.
- Analysis focused on click position, condylar translation, and trajectory changes.
Main Results:
- Arthrography significantly affected the position of opening clicks, occurring later on average.
- These interventions did not significantly alter other examined biomechanical parameters.
- Sagittal condylar movement patterns were influenced in a subset of patients.
Conclusions:
- Arthrography induces minor alterations in TMJ biomechanics.
- These biomechanical changes are not substantial enough to compromise the validity of arthrographic diagnoses for anterior disc displacement with reduction.