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Measurement of occipitocervical angle
Naoki Shoda1, Katsushi Takeshita, Atsushi Seichi
1Departments of Orthopaedic Surgery, The University of Tokyo, Tokyo, Japan. tkyort-office@umin.ac.jp
Spine
|May 8, 2004
Summary
The McGregor line offers the most reliable method for measuring the occipitocervical angle, showing superior reproducibility in this comparative study of radiographic techniques.
Area of Science:
- Radiographic measurement techniques
- Cervical spine alignment
- Occipitocervical angle assessment
Background:
- No prior studies have compared different methods for measuring the occipitocervical angle.
- Accurate measurement of occipitocervical alignment is crucial in diagnosing spinal conditions.
Purpose of the Study:
- To compare the reliability of three techniques (Chamberlain, McRae, and McGregor lines) for measuring the occipitocervical angle.
- To determine the most reproducible method for assessing occipitocervical alignment using lateral cervical radiographs.
Main Methods:
- Lateral cervical radiographs of 30 healthy volunteers were analyzed.
- Measurements of the occipitocervical angle were taken using the Chamberlain, McRae, and McGregor lines.
- Five spine surgeons independently performed measurements to assess intraobserver and interobserver reliability.
Main Results:
- The McGregor line demonstrated the highest intraobserver (ICC: 0.975) and interobserver (ICC: 0.972) reliability.
- The Chamberlain line showed good reliability (intraobserver ICC: 0.956, interobserver ICC: 0.939).
- The McRae line exhibited the lowest reliability for both intraobserver (ICC: 0.835) and interobserver (ICC: 0.802) measurements.
Conclusions:
- The McGregor line is the most reliable and reproducible method for measuring the occipitocervical angle.
- This finding provides valuable guidance for clinicians and researchers utilizing radiographic assessment of cervical spine alignment.