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Role of tectorial membrane in the stability of the upper cervical spine
T Oda1, M M Panjabi, J J Crisco
1Department of Orthopaedic Surgery, Osaka University Medical School, Osaka, Japan.
Abstract:
The purpose of this in vitro experimental study was to determine the role of the tectorial membrane in providing stability to the upper cervical spine. Five fresh human cadaveric specimens from the occiput to C3 were studied with a flexibility protocol: we applied the physiological moments of flexion, extension, right/left axial torques, and right/left lateral bendings (up to 1.5 N m), and recorded the ensuing three-dimensional intervertebral motions. Tests were performed in the intact state and then after transection of the tectorial membrane. This injury resulted in significant increases in flexion (6.7°, 28.4%) and axial rotation (5.9°, 7.8%) of C0C1C2 complex. Flexion increased at both C0C1 and C0C2 joints, while axial rotation increased mainly at C0C1 joint. There were minimal changes in lateral bending (2.3°, 8.0%) and no changes in extension (0.7°, 3.5%).
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