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The normal posterior atlantoaxial relationship.

J E Lovelock¹, J A Schuster

¹Rochester General Hospital, NY 14621.

Skeletal Radiology

|January 1, 1991

Summary

A new ratio of the atlantal spinolaminar line to the atlantoaxial interspinous distance was identified in 100 adults. This constant ratio, less than 2.0, aids in detecting hyperflexion injuries of the atlas and axis.

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Area of Science:

Orthopedics
Radiology
Anatomy

Background:

The upper cervical spine, comprising the atlas (C1) and axis (C2), is susceptible to injury.
Assessing atlantoaxial instability is crucial for diagnosing and managing spinal trauma.

Purpose of the Study:

To investigate the relationship between posterior elements of the atlas and axis in healthy adults.
To establish a quantitative measurement for identifying potential atlantoaxial hyperflexion injuries.

Main Methods:

A study was conducted on 100 normal adult volunteers.
Measurements of the atlantal spinolaminar line height and atlantoaxial interspinous distance were performed.

Main Results:

A consistent ratio between the atlantal spinolaminar line height and atlantoaxial interspinous distance was observed.
This ratio was consistently less than 2.0 in all participants, regardless of sex.

Conclusions:

The identified ratio is a reliable indicator of normal atlantoaxial alignment.
This measurement can be a valuable tool for detecting isolated hyperflexion injuries at the atlantoaxial level.

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