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Accuracy and reliability for estimating jaw functional range of motion
Evelina Nilsson1, Helena Grip2, Catharina Österlund1
1Department of Odontology, Clinical Oral Physiology, Umeå University, Umeå 901 87, Sweden.
Gait & Posture
|July 6, 2024
Summary
Three dimensional kinematic analysis accurately measures jaw range of motion (ROM) using movement area and volume. This method offers a reliable tool for assessing jaw function in clinical settings.
Area of Science:
- Biomechanics
- Kinesiology
- Medical Technology
Background:
- Three-dimensional (3D) kinematic analysis captures synchronized jaw and neck motor system data.
- Traditional jaw function assessment relies on linear motion range, limiting comprehensive analysis.
- Integrating jaw movements across three planes allows for detailed description via movement area and volume.
Purpose of the Study:
- To validate the accuracy, test-retest reliability, and intra-individual variability of 3D kinematic analysis for jaw functional range of motion (ROM).
- To assess the precision of 3D kinematic analysis in quantifying jaw movement area and volume.
- To evaluate the reliability of linear jaw and head movement measures using 3D kinematics.
Main Methods:
- Accuracy was determined by measuring known volumes, assessing percentage deviation and correlation.
- Test-retest reliability was evaluated in 17 pain-free participants performing standardized jaw movements.
- Intraclass correlation coefficients (ICC) and Bland-Altman plots assessed reliability; Coefficient of Variation (CV) measured within-session repeatability.
Main Results:
- High accuracy was achieved for volume (0.03±0.59 deviation) and area (1.2±0.45 deviation) measurements, with strong linear correlation (R²=0.99).
- Test-retest reliability ranged from moderate to excellent, with good agreement shown in Bland-Altman plots.
- High repeatability was observed (CVs), though horizontal jaw movements exhibited lower reliability and higher variability.
Conclusions:
- 3D kinematic analysis provides a validated methodological foundation for accurate and reliable jaw functional ROM measurements.
- This approach offers novel measures for evaluating jaw ROM, beneficial for clinical interventions in pain and dysfunction.
- The method highlights natural biological movement variability and the complex jaw-head interplay.
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