Favorable short-term results of arthroplasty are observed in 80–90% of cases, however, over the longer follow up period the percentage of positive outcomes is gradually reduced. Need for revision of the prosthesis or it’s components increases in proportion to time elapsed from the surgery. In addition, such revision is accompanied with a need to substitute the bone defect of the acetabulum. As a solution the authors propose to replace pelvic defects in two stages. During the first stage the defect was filled with bone allograft with platelet-rich fibrin (allografting with the use of PRF technology). After the allograft remodeling during the second stage the revision surgery is performed by implanting standard prostheses. The authors present a clinical case of a female patient with aseptic loosening of acetabular component of prosthesis in the right hip joint, with failed hip function of stage 2, right limb shortening of 2 cm. Treatment results confirm the efficiency and rationality of the proposed bone grafting option. The authors conclude bone allograft in combination with the PRF technology proves to be an alternative to the implantation of massive metal implants in the acetabulum while it reduces the risk of implant-associated infection, of metallosis in surrounding tissues and expands further revision options.
Objective. To analyze the features of the sagittal spino-pelvic balance formation in patients with congenital hip dislocation and its changes after total hip replacement with restoration of the rotation center. Material and Methods. A retrospective analysis of medical documentation of 47 patients with congenital hip dislocation was performed, a total of 62 total hip replacements were performed. Patients were divided into two groups: Group I with unilateral congenital hip dislocation (n = 26) and Group II – with bilateral hip dislocation (n = 21). The processing and study of statistical correlation were carried out using the Spearman method at p ≤ 0.05. Results. Patients with congenital hip dislocation had average preoperative value of the global lumbar lordosis of 64.1°, and the excess value of the sacral slope angle of 46.4°, which led to hyperlordosis. After surgery, the average value of the global lumbar lordosis was 57.2°, the sacral slope – 41.5°. There was a close relationship between these parameters (r = 0.787). Conclusions. Restoration of the hip rotation center in patients with congenital hip dislocation contributes to a decrease in the sacrum incidence, pelvic anteversion, and lordosis.
A variant of preoperative planning for revision interventions on a hip joint named “Method of layer by layer 3D visualization of the defect zone” is suggested. The method is realized via three consecutive steps with the ultimate aim to obtain data on the real acetabular defect geometry and bone tissue density. Using that method 9 patients (mean age 60±2 years) with pelvic bones defects were examined preoperatively. Based on the evaluation results of bone tissue condition in the defect zone the model and size of individual augment within the limits of weight bearing bone were corrected, the points of augment and acetabular component fixation were determined.
Backround. Total hip replacement in cases of traumatic changes of the acetabulum refers to cases of difficult primary arthroplasty and requires detailed preoperative planning and accurate restoration of anatomical relationships in the operated joint.
The aim of the study was to evaluate the structure of pathological changes in the acetabulum in patients with posttraumatic hip arthrosis, to develop a method for their detailed description and to determine the tactics of choosing the type of acetabulum implant.
Methods. The results of treatment of 194 patients with the consequences of acetabulum fractures who underwent total hip arthroplasty in the period from 2014 to 2022 were analyzed. The study was conducted in two stages, at the first stage, the structure of pathological changes, such as defect, deformation, changes in the center of rotation and offset (relatively healthy contralateral joint), was analyzed. A method was developed for choosing the tactics of implantation of the acetabulum component, based on a detailed description of the defect and deformation of the acetabulum. The second stage analyzed the results of treatment of patients for whom planning and surgical treatment was carried out in the period from 2020 to 2022 using the proposed method.
Results. During the first stage of the study, it was revealed that the magnitude of the change in the indicators of the displacement of the rotation center and offset changes by more than 8 mm. statistically significantly increases the likelihood of complications by 17.9%. The restoration of the rotation and offset center reduces the number of complications by 22.3%. The proposed method makes it possible to statistically reliably restore anatomical relationships in the operated hip joint and reduce the number of complications by 10%.
Conclusion. The proposed method allows us to qualitatively and quantitatively describe pathological changes in the bone tissue of the acetabulum. Depending on the degree of displacement of the center of rotation, the walls of the acetabulum and the nature of the defect of the supporting bone tissue, the surgeon can determine the tactics of surgical treatment.
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