Motion in the cervical spine: an experimental study on autopsy specimens

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Lysell, Erland¹

Motion in the cervical spine: an experimental study on autopsy specimens

Acta Orthop Scand. 1969;(suppl 123):1-61

Affiliations

¹From the Department of Orthopaedic Surgery, University of Göteborg, Sweden
Abstract

The primary intention was to demonstrate the intersegmental pattern of motion in the cervical spine and, therefore, an apparatus for threedimensional radiographic examination of autopsy specimens was designed.

The series consisted of 28 autopsy specimens, including C3-Th1, in the age groups 11-67 years. The specimens were indicated with steel balls and tested for the pattern of motion in the sagittal-, frontal- and horizontal planes. The motion in each plane was represented by a number of stepped movements.

After data processing including a number of geometrical transformations, motion diagrams were drawn. T

The motion in extension-flexion was parallel to the sagittal plane, and made its course around an axis in the subjacent vertebral body, perpendicular to this plane. The appearance of the course varied between the different interspaces. Increasing degenerative changes affected the pattern of motion in the sagittal plane so that the freedom of motion between the vertebrae was reduced.

The patterns of motion in latero-flexion and rotation were similar to each other. One movement is always combined with the other and there is only a difference in the proportion between latero-flexion and rotation when the specimen is latero-flexed or rotated. The centre of motion is a point situated in the anterior contour of the body of the moving vertebra and in the sagittal plane. The pattern of motion in the frontal and horizontal planes were not affected by degenerative changes.

The maximum ranges of motion in all planes were calculated, and the results lay within the limits earlier found on examinations of specimens except for the rotation which in this series was lower. Degenerative changes had no effect on the range of motion in any planes or in any interspaces.
Links

DOI: 10.3109/ort.1969.40.suppl-123.01

PubMed: 4907116

WoS: A1969D807100001

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