Atlantoaxial lateral mass joint replacement prosthesis

Abstract

The invention discloses an atlantoaxial lateral mass joint replacement prosthesis. The prosthesis comprises an upper lateral mass joint body and a lower lateral mass joint body, the upper lateral mass joint body is provided with a first screw used for being fixed to a first cervical vertebra atlas bottom lateral mass, and the lower lateral mass joint body is provided with a second screw used for being fixed to a second cervical vertebra atlas top lateral mass. Main bodies of the upper lateral mass joint body and the lower lateral mass joint body are arranged between the first cervical vertebra atlas and the second cervical vertebra atlas, and the contact parts of the upper lateral mass joint body and the lower lateral mass joint body form spherical contact.

Description

technical field [0001] The invention relates to the technical field of orthopedic surgery, in particular to an atlantoaxial mass joint replacement prosthesis. Background technique [0002] The atlantoaxial joint is composed of the first cervical atlas and the second cervical axis, and consists of 3 independent joints, namely, 2 atlantoaxial lateral mass joints and 1 atlantoaxial median joint. The movement of the atlantoaxial joint is to rotate the odontoid process as the vertical axis, so that the head and the atlas can rotate around the odontoid process. Lateral mass fractures caused by trauma, especially the fracture and collapse of the articular surface of the axis, congenital dysplasia of bones and joints, and rheumatic and immune diseases seriously affect the stability and incorporation of the atlantoaxial joint. The mainstream within the range is to perform posterior fixation and fusion between the atlantoaxial joint or the pivot-occipital, so that the atlantoaxial ro...

AI Technical Summary

Problems solved by technology

Lateral mass fractures caused by trauma, especially the fracture and collapse of the articular surface of the axis, congenital dysplasia of bones and joints, and rheumatic and immune diseases seriously affect the stability and incorporation of the atlantoaxial joint. The mainstream within the range is to perform posterior fixation and fusion between the atlantoaxial joint or the pivot-occipital, which eventually loses the rotation of the atlantoaxial or even the flexion and extension of the atlas, which seriously affects the quality of life of the patient.

[0003] The current patent number is CN201410082867.6 bionic low-friction artificial atlantodental joint. This joint is designed to be placed from the oropharynx. Because the oropharynx is more colonized by bacteria, it is easy to cause postoperative infection and cause surgical failure. The patent number is CN201580018323.6. The artificial implant in the lateral joint of the atlantoaxial (C1-2) and its application method. Although the patent avoids the infection of the oropharyngeal approach, the prosthesis requires simultaneous replacement of both sides. General diseases or trauma The damage of the unilateral lateral joint is the main one, and the side of the original relatively intact articular surface is also artificially damaged by replacement at the same time, which increases the time of surgical insertion. Secondly, the inclination angle of the prosthetic articular surface is fixed, due to the variation of each human body. Larger, so the existing technology can not well restore the bionic anatomy and physiology of the atlantoaxial joint

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