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Computed Tomography- and Radiography-Based Morphometric Analysis of the Lateral Mass of the Subaxial Cervical Spine
Nirmal D Patil1, Sudhir K Srivastava1, Sunil Bhosale1
1Department of Orthopaedics, King Edward Memorial Hospital, Seth Gordhandas Sunderdas Medical College, Parel, Mumbai, India.
Study Design:
This was a double-blinded cross-sectional study, which obtained no financial support for the research.
Purpose:
To obtain a detailed morphometry of the lateral mass of the subaxial cervical spine.
Overview Of Literature:
The literature offers little data on the dimensions of the lateral mass of the subaxial cervical spine.
Methods:
We assessed axial, sagittal, and coronal computed tomography (CT) cuts and anteroposterior and lateral X-rays of the lateral mass of the subaxial cervical spine of 104 patients (2,080 lateral masses) who presented to a tertiary care public hospital (King Edward Memorial Hospital, Mumbai) in a metropolitan city in India.
Results:
For a majority of the parameters, males and females significantly differed at all levels (p<0.05). Females consistently required higher (p<0.05) minimum lateral angulation and lateral angulation. While the minimum lateral angulation followed the order of C5
Conclusions:
Larger lateral angulation is required for Indian patients, especially females. The screw length can be effectively calculated by analyzing the lateral X-ray. A CT scan should be reserved for specific indications, and a caution must be exercised while inserting C7 lateral mass screws.
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