Investigation of cervical movements in neck pain patients with the finite helical axis approach

Cescon, Corrado and Ernst, Markus and Schelldorfer, Sarah and Cattrysse, Erik and Clijsen, Ron and Barbero, Marco (2014) Investigation of cervical movements in neck pain patients with the finite helical axis approach. In: Proceedings of the XX Congress of the International Society of Electrophysiology and Kinesiology, 14-18 July 2014, Rome, Italy.

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AIM: The aim of the present study was the analysis of cervical kinematics of neck pain patients using finite helical axis. METHODS: 47 female subjects were enrolled in the study, 17 with neck pain and 30 healthy controls. The subjects were asked to perform voluntary cervical movements in all three cardinal planes at a natural speed. Position and orientation of the head was registered with the VRRS Cervix, a non-invasive 3D-electromagnetic device. The Minimum Convex Hull method and the angle between IHA (Instantaneous Helical Axis) and FHA were calculated as a measure of dispersion (see figure). The FHA dispersion can be represented by the minimum convex hull and the distribution of angles of the IHA relative to the FHA. RESULTS: Healthy subjects had significantly larger range of movement (RoM) compared to the neck pain patients (152±16.5° and 137±18.8° respectively). The CH area was also significantly larger in healthy subjects (9.11±2.86cm2 and 7.35±4.72cm2 respectively). The mean angle was slightly higher in healthy subjects (4.52±1.12° and 3.95±1.0° respectively) but not significantly different. CONCLUSION: Neck pain patients exhibited a reduced RoM and CH compare to healthy subjects while no difference has been detected in the distribution of angles of the IHA. ACKNOWLEDGEMENT: The study was supported by Thim van der Laan Foundation

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