X-ray-film-based method for locating coordinates of pedicle screws

Abstract

The invention relate to an X-ray-film-based method for locating coordinates of pedicle screws, comprising the following steps: measuring transverse diameter, longitudinal diameter and angle of a vertebral pedicle of a centrum on an X-ray plane film; producing a longitudinal extended line A passing the out edge of an vertebral plate by taking thoracic vertebra12-lumbar vertebra 5 as coordinate points; producing a transverse extended line B by midpoints of spinous process midpoint connection lines adjacent to the thoracic vertebra12-lumbar vertebra 5; taking line midpoints of thoracic vertebra zygapophyseal joints as a longitudinal extended line C; taking the line midpoints passing chest 10 spinous process inferior boarder as an extended line D; transferring the intersection point of the extended line A and the extended line B outwards by 4-6mm to reach the locating points of thoracic vertebra12-lumbar vertebra 5; and taking the intersection point of the extended line C and the extendedline D as the locating point of the thoracic vertebra 11. The method of the invention is easy to understand and convenient to operate. As the method is completely performed on the X-ray plane film, radioactive injury directly exerted on human body by the traditional location method is overcome. In addition, influence of spinal column regression and variation in anatomy resulting from the traditional method for locating the pedicle screws is reduced and the method features accurate location, high security and high controllability.

Description

technical field [0001] The invention relates to a positioning method, in particular to a coordinate positioning method of a pedicle screw based on an X-ray film. Background technique [0002] For some patients with spinal degeneration and spinal trauma fractures, it is generally necessary to perform posterior pedicle screw internal fixation. In the past, the following methods were mostly used for traditional positioning: For the lumbar spine: 1. Mager (1986) advocated along the outer facet process of the vertebral body The nail is positioned at the intersection of the marginal vertical line and the transverse process bisector, parallel to the end plate of the vertebral body and at an angle of 15° to the sagittal plane, and goes medially through the pedicle to the subcortex of the anterior vertebral body. 2. Roy-Camille (1986) suggested that the nail should be inserted at the intersection of the extension line of the vertical line of the articular process and the bisector of ...

AI Technical Summary

Problems solved by technology

[0004] For the above traditional methods, when clinicians, especially young doctors, deal with patients with obvious spinal hyperplasia and degeneration, there will be a lot of deviation when positioning the nail. Inwardly or outwardly; Some transverse processes are not very regular, and it is easy to be positioned upward or downward when probing the upper and lower edges of the transverse process

In addition, when probing the upper and lower borders of the transverse process, it is necessary to peel off the exposed transverse process and easily damage the arteriole network around the transverse process, which will inevitably increase the amount of blood loss during the operation

Transverse process fractures occur in some vertebral bodies in some traumatic spinal injuries, which also increases the difficulty of pedicle positioning

Especially those clinicians who are not rich in experience, and there are differences between individuals, they are prone to positioning deviations when faced with the above situations. It can be seen that there are many disadvantages in using the lumbar spine for traditional pedicle positioning marks

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