Preparation method of artificial metatarsophalangeal joint prosthesis

Abstract

A preparation method of an artificial metatarsophalangeal joint prosthesis, comprises the following steps: performing a CT scan on foot of a patient, and importing the CT scan data into three-dimensional reconstruction software Mimics to obtain a first three-dimensional reconstruction model covering metatarsal bone and toe marrow cavities; performing Boolean subtraction operation on the first three-dimensional reconstruction model and a second three-dimensional reconstruction model to obtain a first model (metatarsal bone and toe marrow cavity morphological model); selecting a model separationfunction of three-dimensional reconstruction software Mimics to obtain a second model (metatarsal bone and toe marrow cavity morphological model); designing a head and a stem of the metatarsophalangeal joint prosthesis separately: performing personalized design of an intramedullary stem according to a shape of morphology of marrow cavity, and performing personalized design of a prosthesis head according to a head shape of the foot metatarsal and phalangeal joints; carrying out 3D printing on the designed intramedullary stem prosthesis and then scanning the intramedullary stem prosthesis; andprinting the designed personalized metatarsophalangeal joint prosthesis model. The metatarsophalangeal joint prosthesis prepared through the method has an advantage of personalized manufacturing, theintramedullary stem morphology is matched with the marrow cavity morphology, the joint prosthesis head is close to the normal joint morphology, requirements of patients can be met to the maximum degree, and prosthesis manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of artificial metatarsophalangeal joint prosthesis, in particular to a method for preparing an artificial metatarsophalangeal joint prosthesis. Background technique [0002] A variety of foot degeneration and trauma, including forefoot rheumatoid arthritis, can lead to severe pain, severe deformity or movement disorders of the metatarsophalangeal joints of the foot. With the occurrence and progression of such diseases, they will affect the Metatarsophalangeal joint movement will eventually lead to metatarsophalangeal joint dysfunction or even arthritis, joint dislocation, affecting normal life and work. The previous surgical treatment plan was the fusion of the first metatarsophalangeal joint and the formation of the 2-5 metatarsophalangeal joints. The unfavorable factors were the stiffness of the first metatarsophalangeal joint, which affected the gait and abnormal weight bearing on the forefoot. As the ul...

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Problems solved by technology

[0004] The present invention overcomes the shortcomings in the prior art and provides a method for preparing an artificial metatarsophalangeal joint prosthesis, aiming at the need for artificial metatarsophalangeal joint prosthesis replacement for patients with clinical metatarsophalangeal joint movement disorders, and realizing personalized artificial metatarsophalangeal joint prosthesis Toe joint prosthesis preparation, the intramedullary stem of the prosthesis is based on the personalized design of the metatarsal and toe bone medullary cavity, and the joint head is based on the anatomical shape of the metatarsophalangeal joint head, which is more in line with the anatomical prosthesis design and functional requirements

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