Estimation of efficiency of hip joint capsule cut fixation with polypropylene mesh
DOI:
https://doi.org/10.32347/2410-2547.2019.103.177-188Keywords:
capsule, hip joint, endoprosthesis, stress-strain state, model, finite element methodAbstract
Relevance. Dislocation of the femoral component of the endoprosthesis is one of the most frequent complications in the total hip joint endoprosthesis (THJE). There are many factors for the development of dislocations. The best option to «treatment» a dislocation in THJE is to prevent the development of primary instability. Of particular relevance to the restoration of the capsule-ligament apparatus is for people with obesity. Careful restoration of soft tissue structures or the preservation of these structures using modified accesses significantly reduces the incidence of dislocations. Currently developed many ways to strengthen and restore the posterior structures of the hip joint capsule. In this paper, we study a method for restoring and strengthening the posterior structures of the hip joint capsule using polypropylene-based mesh implants. Purpose: to evaluate the effectiveness of using a polypropylene mesh to close a defect in the hip joint capsule. Materials and methods. The study was carried out in a software package based on the finite element method. For the rational use of computer resources, a computational model was built, which consisted only of the capsule model and the endoprosthesis head model. The dimensions of the elements of the computational model corresponded to the actual dimensions of these objects. In this paper, two ways of capsule suturing were investigated: interrupted sutures and polypropylene mesh. Also, an additional control model of the same dimensions was constructed, but in which the incision was not sutured. Results and its discussion. As a result of the calculations, pictures of the distribution of the stress-strain state in the «head-capsule» system were obtained. To assess the effectiveness of the method of closing the capsule, as the main characteristics, the values of the opening of the incision, as well as the stresses arising in the joint capsule, were chosen. An additional characteristic is selected stresses in the head. Conclusions. The obtained calculation results indicate that with the considered options for fixing the cut, both in terms of rigidity and strength, the model of fixing the defect with a mesh is more effective.
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