Components Of Endoprosthesis Research Articles

Study of neuromuscular activity in preparation for revision knee arthroplasty

The results of an electromyographic study of 13 patients, aged 50–87 years, with aseptic instability of the components of a knee joint endoprosthesis at the stage of preparation for revision arthroplasty, who were treated at the Republican Scientific and Practical Center of Trauma tology and Orthopedics in the period from 2013 to 2020, were analyzed. To assess the orthopedic status, we used: clinical examination, radiography of the knee joint in 2 standard and axial projections, topogram and CT scan. lectrophysiological studies provide important information for elucidating the etiopathogenesis of knee joint endoprosthesis instability. One of the causes of instability may be an imbalance in the activity of the flexor and extensor muscles that develops during walking, subsequently leading to periprosthetic osteolysis, which occurs as a response to the formation of wear and tear products of the components of the endoprosthesis.

The role of radiation diagnostic methods in pathological changes of the hip joint before and after endoprosthetics

Endoprosthesis replacement-operational treatment of diseases and damages of hip joint. The problem of prevention of complications and their negative effects is extremely actual today. However the role of different beam techniques in identification of adverse effects and complications of endoprosthesis replacement of joints is studied insufficiently. Results of clinic and diagnostic and beam researches of 40 patients with pathology of hip joint are analyzed. The used beam methods of research - roentgenography, multispiral computed tomography. At presurgical stage the main objec­tive was detection of pathology of joint, definition of indications and planning of operative measure. Situation and relationship of components of endoprosthesis, condition of bone tissue, and also bone cement round cup and leg of prosthesis were key parameters of radiological assessment of outcomes of endoprosthesis replacement. Complex use of radiological techniques (roentgenography and spiral computed tomography) allows to specify and add semiotics of changes of bone tissue at the level of acetabular hollow and proximal department of femur after endoprosthesis re­placement.

The Evaluation of Early Results after Total Hip Replacement in Dysplastic Hip Patients

The Evaluation of Early Results after Total Hip Replacement in Dysplastic Hip Patients Introduction. Dysplasia of hip joint leads to osteoarthritis. Suffer relatively young population in ages between 20 and 40. Due to severe changes of anatomy total hip replacement (THR) in dysplastic hip patients is a challenge for orthopaedic surgeons. Radical anatomical and biomechanical reconstruction may lead to high complication rate. The planning of the rotation center of hip joint is a key of success in the treatment of dysplastic osteoarthritis patients. Aim of the Study. The aim of the study was to evaluate the early results for dysplastic osteoarthritis patients (DOA), who underwent THR in Riga State Hospital of Traumatology and Orthopaedics in 2008-2009. Materials and methods. 63 THR were performed in 59 patients (50 women, 9 men). In all cases cementless acetabular components of endoprosthesis were used. Functional evaluation was made due to method of grading functional value of hip - Merle d'Aubigne and Postel. Hip dysplasia was divided in 4 groups due to classification after Crowe. Special digital orthopaedic programmes (AGFA, IMPAX) were used for preoperative planning and radiographic postoperative analysis. Results. Regarding to method of grading functional value of hip - Merle d'Aubigne and Postel we found out a significant improvement in range of movements, mobility and pain relief. Due to Crowe classification there were 19 patients with Crowe type I dysplasia, 29 with Crowe type II and 15 with Crowe type III. 43 acetabular cups were placed in the primary socket and 20 in the secondary socket. Radiographic analysis showed significant changes in location of rotation center of hip and offset after THR in dysplastic hip patients. Conclusions. Significant functional improvement was achieved after THR in DOA patients and the radiographic analysis showed significant decrease of horizontal location of RC and increase of offset after THR in DOA patients.