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T1 intralaminar screws: an anatomic, morphologic study.

John Weaver¹, Shane Seipel, Jason Eubanks

¹Case Western Reserve School of Medicine, Cleveland, OH 44106, USA.

|April 18, 2013

Summary

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Intralaminar screws in the upper thoracic spine offer a safe alternative to pedicle screws. Anatomical study of T1 vertebrae confirms feasibility for common screw sizes, aiding complex spinal surgeries.

Area of Science:

Orthopedic Surgery
Spinal Anatomy
Neurosurgery

Background:

Intralaminar screw placement is a potential alternative to pedicle screws in the upper thoracic spine for complex cases.
No detailed anatomical study has assessed the T1 lamina's suitability for screw fixation.

Purpose of the Study:

To evaluate the anatomical feasibility of intralaminar screw placement in the T1 lamina.
To determine the morphometric parameters of the T1 lamina relevant to screw fixation.

Main Methods:

Analysis of anatomical data from 112 T1 vertebrae.
Measurement of T1 lamina height, width (segmented), and length.
Assessment of screw placement feasibility for common diameters (3.5-4 mm) and lengths (24-26 mm).

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Main Results:

T1 lamina morphology supports the placement of standard intralaminar screws in most cases.
Screw placement was feasible in all but 2 of 112 analyzed T1 vertebrae.
Significant correlations were found between T1 lamina size and patient height and sex.

Conclusions:

The T1 lamina is anatomically suitable for safe and simple intralaminar screw placement.
This technique serves as a viable alternative or salvage option to pedicle screw fixation in the upper thoracic spine.