Universität zu Köln

Ott, N., Harland, A., Scaal, Martin, Koenig, J., Bredow, J., Eysel, P., Mueller, L. P. and Meyer, C. (2021). The role of the transversal ligament on the atlantoaxial complex-Bending forces at C1/2 flexion limits in the elderly. Clin. Biomech., 84. OXFORD: ELSEVIER SCI LTD. ISSN 1879-1271

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Abstract

Introduction: Biomechanical functionality as well as trauma mechanisms of the atlantoaxial complex are still an issue of controversy. The transverse atlantal ligament is the strongest stabilizator. The present study aimed to analyze the bending forces of the transverse atlantal ligament and of the base of the odontoid in elderly specimens. Methods: In this biomechanical study five cadaveric specimen with a mean age of 72 at death and bone mineral density measuring for 555.3 Hounsfield units on average were used. To analyze the strain of the transverse atlantal ligament and the dense base, strain gauges were used. A custom biomechanical setup was used to test each specimen at C1/2 flexion and the strain of the transverse atlantal ligament and the dens base (mu m/m) were measured. Findings: In four out of five, a rupture of the transverse atlantal ligament was observed, the mean force required for the ligament to fall was 175 N (min. 99.8 N; 249.2 N; SD 64.7) by a mean strain of 2102.9 mu m/m (min. 1953.5 mu m/m; max. 2272.3 mu m/m; SD 189.7). In one specimen with the lowest Hounsfield units (155), the dens base fractured before the transverse atlantal ligament ruptured and no strain could be measured at the transversal ligament during movement afterwards. Interpretation: The transverse atlantal ligament fails at an average of 175 N in the elderly, which is less than the value reported previously. In osteoporotic specimen the generated force to rupture the transverse atlantal ligament can fracture the dens itself.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ott, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harland, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scaal, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Koenig, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bredow, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eysel, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, L. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meyer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-573032
DOI:	10.1016/j.clinbiomech.2021.105329
Journal or Publication Title:	Clin. Biomech.
Volume:	84
Date:	2021
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1879-1271
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language UPPER CERVICAL-SPINE; CT-FUNCTIONAL DIAGNOSTICS; ODONTOID FRACTURES; LONGITUDINAL LIGAMENT; ROTATORY INSTABILITY; ATLANTAL LIGAMENT; BIOMECHANICS; OSSIFICATION; MANAGEMENT; INJURIES Multiple languages Engineering, Biomedical; Orthopedics; Sport Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57303