Home
About Us
Issues
Authors
Reviewers
Users
Subscription
Our Other Journals
Site map
Aims and Scope
Salient Features
Editorial Board
Editorial Statements
Editorial-PeerReview Process
Publication Ethics & Malpractice
Ijars Performance
Journal Policy
Contact Us
Current Issue
Forthcoming
Article Archive
Access Statistics
Simple Search
Advanced Search
Submit an Article
Instructions
Assistance
Publication Fee
Paid Services
Apply As Reviewer
Acknowledgment
Register Here Edit Register
Register For Article Submission
Login Here Logout
Login For Article Submission
Annual
Buy One Issue
Payment Options
How to Order
JCDR
IJNMR
NJLM

 

Welcome : Guest

Users Online :

 

 

 

 

 

 

 

 

Original article / research

Year :2020 Month : March-April Volume : 9 Issue : 2 Page : AO01 - AO03

Posterior Screw Placement on Lateral Mass of Atlas: An Anatomical Perspective

Correspondence Address :
Anju Mary Albert,
Dr. Anju Mary Albert,
Assistant Professor, Department of Anatomy, Believers Church Medical College, Thiruvalla-689103, Kerala, India.
E-mail: dranjubalu@gmail.com
Introduction: Introduction: Fusion of the occipitocervical or atlantoaxial vertebra is an accepted treatment option in upper cervical spine instability caused by cervical trauma or various other disorders. The C1-C2 fusion techniques have limitations which may be overcome by the lateral mass screws. Posterior screw placement in the atlas lateral mass avoids the loss of occipitocervical motion and enables posterior C1-C2 fusion in patients. This is followed in patients who are not suitable for transarticular screw fixation.

Aim: To define ideal entry point, exit point, trajectory and dimensions of the lateral mass screw during the posterior screw fixation of atlas vertebra, to avoid damage to vertebral artery and contents of vertebral canal.

Material and Methods: For this study 50 intact dried human atlas vertebrae from the Indian population were measured using a digital Vernier calliper that provides accurate resolution up to 0.01 mm and a goniometer. The measurements were entered in an excel sheet. Mean and standard deviation were calculated.

Results: In the present study, the ideal entry point for the lateral mass screw to prevent damage to 1st part of vertebral artery was found to be the midpoint of pedicle analog of atlas. The ideal exit point for the screw to avoid injury vertebral canal contents and 2nd part of vertebral artery was on the anterior surface of lateral mass at a distance of 16.3 mm (SD=1.8) from the anterior tubercle. The horizontal angulation of screw trajectory was found to be 4 degrees medial and vertical angulation 5.4 degrees superior. The distance between entry point and ideal exit point was taken as the optimum length of screw (17.3 mm). The optimum width of screw was calculated by adding the distance of lateral mass inferior to pedicle analog and the thickness of vertebral artery groove (7.2 mm).

Conclusion: The above findings and landmarks will be of great help to spine surgeons while performing posterior screw fixation of lateral mass of atlas vertebra.
 
[ FULL TEXT ]   |   [ ]
 

Article Utilities

  • Readers Comments
  • Article in PDF
  • Citation Manager
  • Article Statistics
  • Link to PUBMED
  • Print this Article
  • Send to a Friend

Quick Links

REVIEWER
ACCESS STATISTICS
Home  |  About Us  |  Online First  |  Current Issue  |  Simple Search  |  Advance Search  |  Register  |  Login  |  Contact  |  Privacy Policy  |  Terms of Use
Author Support  |  Submit Manuscript  |  IJARS Pre-Publishing  |  Reviewer  |  Articles Archive  |  Access Statistics
©INTERNATIONAL JOURNAL OF ANATOMY RADIOLOGY & SURGERY (IJARS), ISSN : 2277-8543.
EDITORIAL OFFICE : 1/9, Roop Nagar, Delhi 11000. Phone : 01123848553

* This Journal is owned and run by medical professionals *