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Does manual mobilization influence motion coupling patterns in the atlanto-axial joint?
E Cattrysse1, J P Baeyens, P Kool
1Vrije Universiteit Brussel, Department of Experimental Anatomy (EXAN), Laarbeeklaan 103, B1090 Brussels, Belgium. ecattrys@vub.ac.be
Summary
Manual mobilization of the cervical spine reveals consistent contralateral coupling patterns between axial rotation and lateral bending at C1-C2. Individual anatomical variations influence these motion coupling patterns.
Area of Science:
- Biomechanics of the cervical spine
- Spinal kinematics
- Manual therapy research
Background:
- Limited in vitro studies exist on atlanto-axial joint coupling patterns under pure moments.
- Previous research has not extensively analyzed segmental motion coupling during cervical manual mobilization.
Purpose of the Study:
- To analyze segmental motion coupling patterns in the atlanto-axial joint during cervical manual mobilization.
- To investigate the relationship between manual mobilization techniques and resulting spinal motion.
Main Methods:
- Utilized an electromagnetic tracking system to record sensor positions on the atlas (C1) and axis (C2) in ten human spinal specimens.
- Employed a 3D-digitizing stylus to define bone-embedded coordinate systems.
- Recorded segmental motion coupling during manual mobilization across the full range of axial rotation and lateral bending.
Main Results:
- Confirmed a contralateral coupling pattern of axial rotation with lateral bending at the C1-C2 joint, consistent with prior research.
- Cross-correlation analysis provided a more objective method for interpreting coupling patterns, especially during lateral bending.
- Observed significant inter-individual variability in motion coupling patterns.
Conclusions:
- The developed method enables the study of coupled motion during manual diagnostic and therapeutic interventions.
- Clinicians should recognize the three-dimensional nature of manual mobilizations and their impact on motion coupling.
- Observed motion coupling patterns may be influenced by individual specimen anatomy.
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