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At least 19 recordsLinked to original sources
PubMed1976

[Fractures of the dens of the 2d cervical vertebra and their treatment].

Fractures of the dens axis make 10-15 per cent to all injuries of the cervical portion of the vertebral column. The potential danger of these injuries and difficulties of their treatment are conditioned by anatomo-functional features of this portion of the spine. The mechanism of fractures of the dens axis is not clear yet. Clinical manifestations of dens axis fractures are determined by the character and extent of its desplacement. Its diagnosis is somewhat difficult sometimes. Conservative therapy is not always a success. The existing methods of surgical treatment of dens axis fractures make it possible to gain the cure nearly in all cases.

Axis, Cervical Vertebra↗
PubMed1986

The orientation of the cervical vertebral column in unrestrained awake animals. I. Resting position.

The orientation of the cervical vertebral column was studied by X-ray photography of the region containing the head and the neck in nine unrestrained species of vertebrates (man, monkey, cat, rabbit, guinea pig, rat, chicken, frog, lizard). In addition, the orientation of the horizontal semicircular canals was measured in four species using landmarks on the skull. In all vertebrates studied, with the exception of frog and lizard, the general orientation of the cervical vertebral column was vertical when animals were at rest, and not horizontal or oblique as suggested by the macroscopic appearance of the neck. The posture of the animal, whether lying, sitting or standing, had little effect on this general vertical orientation, although some variability was noticed depending on the species. This finding prompted the definition of a resting zone, where the cervical column can take any orientation within a narrow range around a mean position. The cervical vertebral column composes part of the S-shaped structure of the entire vertebral column, with one inflection around the cervico-thoracic (C7/Th1) junction. This feature is already noticable in the lizard. The vertical orientation of the cervical vertebral column is interpreted to provide a stable and energy saving balance of the head. Furthermore, when the head is lowered or raised, the atlanto-occipital and cervico-thoracic junctions are predominantly involved, while the entire cervical column largely preserves its intrinsic configuration. The curved configuration of the cervico-thoracic vertebral column embedded in long spring-like muscles is interpreted to function as a shock absorber. At rest, animals did not hold their heads with the horizontal canals oriented earth horizontally all the time, but often maintained them pitched up by ca. 5 deg, as has been reported for man. At other times, presumably when the vigilance level increased, the horizontal canals were brought into the earth horizontal plane. The vertical orientation of the cervical column results in a vertical positioning of the odontoid process of the axis (second cervical vertebra, C2), which thus provides the axis of rotation for yaw movements of the head. This axis corresponds to that of the horizontal semicircular canals. The vertical organization of the cervical vertebral column in birds and mammals, whether the animal is quadrupedal or bipedal, points to a common organizational principle for eye and head movement systems.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed1976

[Clinic of the upper cervical spine and review of the medical history of the regional osteology (author's transl)].

After a brief review of the systematic clinical work up of this region within our century, the medical history of the osteology of the occipito-cervical junction is given special attention. It is looked upon the illustrations of the first printed anatomical textbooks that are linked with such famous names as Berengario, Dryander, Estienne, Vesal and Eustachius. Leonardo da Vinci's concept of the first two vertebrae is also mentioned.

Anatomy↗
PubMedDate not supplied

Os odontoideum in children: neurological manifestations and surgical management.

The os odontoideum is a congenital anomaly of the 2nd cervical vertebra. It is an ossicle that is separated from the body of the axis by a variable transverse gap. This weakens atlantoaxial stability. When ligamentous support also fails, subluxation ensues. Compressive myelopathy and vertebral artery obliteration may occur. Eight cases, all in children, were studied prospectively. The neurological manifestations and surgical indications and treatment are discussed.

Adolescent↗
PubMed1978

Atlanto-axial arthrodesis by the wedge compression method.

Fifteen patients with atlanto-axial instability (secondary to os odontoideum in three, nonunion of an odontoid fracture in seven, acute odontoid fracture in three, and rheumatoid arthirtis in two) were treated by wedge compression arthrodesis of the atlanto-axial joint. One patient died at home eight weeks after fusion with the cause of death never established. Of the two patients with rheumatoid arthritis (ankylosing spondylitis), one had a non-union and in the other the posterior arch of the atlas fractured and the fusion had to be extended up to the occiput and down to the third cervical vertebra. The procedure is rarely indicated in patients with long-standing rheumatoid arthritis or severe osteopenia.

Adult↗
PubMed1988

Atlas fractures: treatment and long-term results.

Fractures of the first cervical vertebra (C1) represent approximately 7% of all acute cervical spine fractures. Frequently, the atlas will be fractured in combination with the axis (44% of cases). Treatment of isolated C1 fractures should be governed by the rules of Spence. The treatment of combination C1-C2 fractures is dictated by the type and severity of the C2 fracture. Experience with 57 cases of acute traumatic atlas fractures are reviewed. The long-term outcome from an atlas fracture is good (median follow-up, 40 months).

Adolescent↗
PubMed1979

The rotational component in the dynamics of the C2-3 spinal segment.

The technique of the PA axial projection of the arches of the upper cervical vertebrae into the occipital foramen and the normal findings, are described. The influence of maximum forced anteflexion at the craniocervical junction and rotation of the head on the relations of atlas and axis is demonstrated. It seems that in this position rotation at atlas-axis level is restricted and partly transmitted to the C2-3 segment. Thus, selective clinical examination of the rotational component of the dynamics at C2-3 can be achieved and the pathological restrictions of movement can be assessed.

Axis, Cervical Vertebra↗
PubMed1979

Management of chronic atlantoaxial dislocation.

Twenty-two patients with chronic atlantoaxial dislocation have been treated. Of 13 patients with a reducible dislocation by skeletal traction, 12 underwent successful posterior infusion of the first, second and third cervical vertebrae. Of nine patients with irreducible dislocation, eight underwent surgical reduction and fusion through the transoral approach. The reduction was successful in all eight, but fusion was accomplished in four.

Adolescent↗