Burns & Trauma最新文献

{"title":"P-MSC-derived extracellular vesicles facilitate diabetic wound healing via miR-145-5p/ CDKN1A-mediated functional improvements of high glucose-induced senescent fibroblasts.","authors":"Jianlong Su,&nbsp;Qian Wei,&nbsp;Kui Ma,&nbsp;Yaxi Wang,&nbsp;Wenzhi Hu,&nbsp;Hao Meng,&nbsp;Qiankun Li,&nbsp;Yuehou Zhang,&nbsp;Wenhua Zhang,&nbsp;Haihong Li,&nbsp;Xiaobing Fu,&nbsp;Cuiping Zhang","doi":"10.1093/burnst/tkad010","DOIUrl":"https://doi.org/10.1093/burnst/tkad010","url":null,"abstract":"<p><strong>Background: </strong>Persistent hyperglycaemia in diabetes causes functional abnormalities of human dermal fibroblasts (HDFs), partially leading to delayed skin wound healing. Extracellular vesicles (EVs) containing multiple pro-healing microRNAs (miRNAs) have been shown to exert therapeutic effects on diabetic wound healing. The present study aimed to observe the effects of EVs derived from placental mesenchymal stem cells (P-MSC-EVs) on diabetic wound healing and high glucose (HG)-induced senescent fibroblasts and to explore the underlying mechanisms.</p><p><strong>Methods: </strong>P-MSC-EVs were isolated by differential ultracentrifugation and locally injected into the full-thickness skin wounds of diabetic mice, to observe the beneficial effects on wound healing <i>in vivo</i> by measuring wound closure rates and histological analysis. Next, a series of assays were conducted to evaluate the effects of low (2.28 x 10¹⁰ particles/ml) and high (4.56 x 10¹⁰ particles/ml) concentrations of P-MSC-EVs on the senescence, proliferation, migration, and apoptosis of HG-induced senescent HDFs <i>in vitro</i>. Then, miRNA microarrays and real-time quantitative PCR (RT-qPCR) were carried out to detect the differentially expressed miRNAs in HDFs after EVs treatment. Specific RNA inhibitors, miRNA mimics, and small interfering RNA (siRNA) were used to evaluate the role of a candidate miRNA and its target genes in P-MSC-EV-induced improvements in the function of HG-induced senescent HDFs.</p><p><strong>Results: </strong>Local injection of P-MSC-EVs into diabetic wounds accelerated wound closure and reduced scar widths, with better-organized collagen deposition and decreased p16INK4a expression. <i>In vitro</i>, P-MSC-EVs enhanced the antisenescence, proliferation, migration, and antiapoptotic abilities of HG-induced senescent fibroblasts in a dose-dependent manner. MiR-145-5p was found to be highly enriched in P-MSC-EVs. MiR-145-5p inhibitors effectively attenuated the P-MSC-EV-induced functional improvements of senescent fibroblasts. MiR-145-5p mimics simulated the effects of P-MSC-EVs on functional improvements of fibroblasts by suppressing the expression of cyclin-dependent kinase inhibitor 1A and activating the extracellular signal regulated kinase (Erk)/protein kinase B (Akt) signaling pathway. Furthermore, local application of miR-145-5p agomir mimicked the effects of P-MSC-EVs on wound healing.</p><p><strong>Conclusions: </strong>These results suggest that P-MSC-EVs accelerate diabetic wound healing by improving the function of senescent fibroblasts through the transfer of miR-145-5p, which targets cyclin-dependent kinase inhibitor 1A to activate the Erk/Akt signaling pathway. P-MSC-EVs are promising therapeutic candidates for diabetic wound treatment.</p>","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"11 ","pages":"tkad010"},"PeriodicalIF":5.3,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10583213/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49674555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Actin polymerization inhibition by targeting ARPC2 affects intestinal stem cell homeostasis.","authors":"Ruzhen Zhang,&nbsp;Sheng Chen,&nbsp;Zhifan Yang,&nbsp;Ning Zhang,&nbsp;Kenan Guo,&nbsp;Keyi Lv,&nbsp;Zimo Zhou,&nbsp;Meijiao Gao,&nbsp;Xiancheng Hu,&nbsp;Yongping Su,&nbsp;Jianming He,&nbsp;Fengchao Wang","doi":"10.1093/burnst/tkad038","DOIUrl":"10.1093/burnst/tkad038","url":null,"abstract":"<p><strong>Background: </strong>The rapid turnover of the intestinal epithelium is driven by the proliferation and differentiation of intestinal stem cells (ISCs). The dynamics of the F-actin cytoskeleton are critical for maintaining intercellular force and the signal transduction network. However, it remains unclear how direct interference with actin polymerization impacts ISC homeostasis. This study aims to reveal the regulatory effects of the F-actin cytoskeleton on the homeostasis of intestinal epithelium, as well as the potential risks of benproperine (BPP) as an anti-tumor drug.</p><p><strong>Methods: </strong>Phalloidin fluorescence staining was utilized to test F-actin polymerization. Flow cytometry and IHC staining were employed to discriminate different types of intestinal epithelial cells. Cell proliferation was assessed through bromo-deoxyuridine (BrdU) and 5-ethynyl-2'-deoxyuridine (EdU) incorporation assays. The proliferation and differentiation of intestinal stem cells were replicated <i>in vitro</i> through organoid culture. Epithelial migration was evaluated through BrdU pulse labeling and chasing in mice.</p><p><strong>Results: </strong>The F-actin content was observed to significantly increase as crypt cells migrated into the villus region. Additionally, actin polymerization in secretory cells, especially in Paneth cells (PCs), was much higher than that in neighboring ISCs. Treatment with the newly identified actin-related protein 2/3 complex subunit 2 (ARPC2) inhibitor BPP led to a dose-dependent increase or inhibition of intestinal organoid growth <i>in vitro</i> and crypt cell proliferation <i>in vivo</i>. Compared with the vehicle group, BPP treatment decreased the expression of Lgr5 ISC feature genes <i>in vivo</i> and in organoid culture. Meanwhile, PC differentiation derived from ISCs and progenitors was decreased by inhibition of F-actin polymerization. Mechanistically, BPP-induced actin polymerization inhibition may activate the Yes1-associated transcriptional regulator pathway, which affects ISC proliferation and differentiation. Accordingly, BPP treatment affected intestinal epithelial cell migration in a dose-dependent manner.</p><p><strong>Conclusion: </strong>Our findings indicate that the regulation of cytoskeleton reorganization can affect ISC homeostasis. In addition, inhibiting ARPC2 with the Food and Drug Administration-approved drug BPP represents a novel approach to influencing the turnover of intestinal epithelial cells.</p>","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"11 ","pages":"tkad038"},"PeriodicalIF":5.3,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10578047/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41232571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A photoactivatable and phenylboronic acid-functionalized nanoassembly for combating multidrug-resistant gram-negative bacteria and their biofilms.","authors":"Xiaoqing Zhou,&nbsp;Lanlan Dong,&nbsp;Baohua Zhao,&nbsp;Guangyun Hu,&nbsp;Can Huang,&nbsp;Tengfei Liu,&nbsp;Yifei Lu,&nbsp;Mengxue Zheng,&nbsp;Yanlan Yu,&nbsp;Zengjun Yang,&nbsp;Shaowen Cheng,&nbsp;Yan Xiong,&nbsp;Gaoxing Luo,&nbsp;Wei Qian,&nbsp;Rui Yin","doi":"10.1093/burnst/tkad041","DOIUrl":"10.1093/burnst/tkad041","url":null,"abstract":"<p><strong>Background: </strong>Multidrug-resistant (MDR) gram-negative bacteria-related infectious diseases have caused an increase in the public health burden and mortality. Moreover, the formation of biofilms makes these bacteria difficult to control. Therefore, developing novel interventions to combat MDR gram-negative bacteria and their biofilms-related infections are urgently needed. The purpose of this study was to develop a multifunctional nanoassembly (IRNB) based on IR-780 and N, N'-di-sec-butyl-N, N'- dinitroso-1,4-phenylenediamine (BNN6) for synergistic effect on the infected wounds and subcutaneous abscesses caused by gram-negative bacteria.</p><p><strong>Methods: </strong>The characterization and bacteria-targeting ability of IRNB were investigated. The bactericidal efficacy of IRNB against gram-negative bacteria and their biofilms was demonstrated by crystal violet staining assay, plate counting method and live/dead staining <i>in vitro</i>. The antibacterial efficiency of IRNB was examined on a subcutaneous abscess and cutaneous infected wound model <i>in vivo</i>. A cell counting kit-8 assay, Calcein/PI cytotoxicity assay, hemolysis assay and intravenous injection assay were performed to detect the biocompatibility of IRNB <i>in vitro</i> and <i>in vivo</i>.</p><p><strong>Results: </strong>Herein, we successfully developed a multifunctional nanoassembly IRNB based on IR-780 and BNN6 for synergistic photothermal therapy (PTT), photodynamic therapy (PDT) and nitric oxide (NO) effect triggered by an 808 nm laser. This nanoassembly could accumulate specifically at the infected sites of MDR gram-negative bacteria and their biofilms via the covalent coupling effect. Upon irradiation with an 808 nm laser, IRNB was activated and produced both reactive oxygen species (ROS) and hyperthermia. The local hyperthermia could induce NO generation, which further reacted with ROS to generate ONOO^-, leading to the enhancement of bactericidal efficacy. Furthermore, NO and ONOO^- could disrupt the cell membrane, which converts bacteria to an extremely susceptible state and further enhances the photothermal effect. In this study, IRNB showed a superior photothermal-photodynamic-chemo (NO) synergistic therapeutic effect on the infected wounds and subcutaneous abscesses caused by gram-negative bacteria. This resulted in effective control of associated infections, relief of inflammation, promotion of re-epithelization and collagen deposition, and regulation of angiogenesis during wound healing. Moreover, IRNB exhibited excellent biocompatibility, both <i>in vitro</i> and <i>in vivo</i>.</p><p><strong>Conclusions: </strong>The present research suggests that IRNB can be considered a promising alternative for treating infections caused by MDR gram-negative bacteria and their biofilms.</p>","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"11 ","pages":"tkad041"},"PeriodicalIF":5.3,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/7e/7f/tkad041.PMC10578387.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41232570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical modeling of variants of thoracolumbar junction transpedicular fixation after resection of Th12 vertebra under compressive load","authors":"O. Nekhlopochyn, V. Verbov, I. Cheshuk, M. Karpinsky, O. Yaresko","doi":"10.22141/1608-1706.2.24.2023.940","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.940","url":null,"abstract":"Background. The area of the thoracolumbar junction is characterized by a significant load that dictates increased requirements to stabilization, which should not only provide a reliable and rigid fixation, but also ensure the maximum uniform distribution of the load on all elements of both the metal structure and the bone tissue to exclude the failure of fixation in the long run. Purpose of the study is to investigate the influence of the transpedicular screw length and the presence of crosslinks on the load distribution during surgical resection of one vertebra from the thoracolumbar junction under the influence of axial compressive load. Materials and methods. We analyzed mathematical finite-element model of the part of thoracolumbar spine (Th9-L5), where the Th12 vertebra was removed and replaced by an interbody implant with additional fixation by a transpedicular system. Four variants of transpedicular fixation were modeled using short and long screws, as well as with and without two crosslinks. The stress-strain state of the models was studied under the influence of a vertical compressive distributed load of 350 N. Results. When using short screws and in the absence of crosslinks, the maximum stresses in the Th10, Th11, L1, and L2 vertebrae are 7.2, 5.3, 4.2, and 14.3 MPa, respectively, when using long screws without crosslinks — 6.5, 4.6, 3.8 and 13.5 MPa. The model with short screws and crosslinks shows 7.1, 4.4, 3.9 and 14.0 MPa, while the application of long screws with crosslinks is 6.3, 4.5, 3.5 and 13.2 MPa, respectively. Conclusions. With a compressive load, the use of long screws allows to reduce the level of stress in the bone elements of the models, the use of crosslinks provides greater rigidity to the posterior support of the transpedicular structure, which leads to an increase in stress on the fixing screws but allows to reduce the level of stress in the bone tissue.","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"49 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73433131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnosis, treatment and monitoring of patients with primary malignant tumors of the bones of the pelvis and lower extremities: promising technologies","authors":"O. Drobotun","doi":"10.22141/1608-1706.2.24.2023.945","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.945","url":null,"abstract":"Background. Diagnosis and treatment of patients with malignant bone tumors requires continuous improvement of existing methods of diagnosis and treatment. Purpose: to improve the treatment results in patients with tumors of the femur and pelvis through the application of medical imaging technologies, 3D modeling and 3D printing of personalized models of bones and tumors, arthroplasty and bioactive ceramics. Materials and methods. Examination, treatment and monitoring of 28 patients with malignant tumors of the bones of the pelvis, lower extremities and examination of 16 apparently healthy people were performed. Computed tomography (CT) and magnetic resonance imaging (MRI), 3D modeling, biochemical markers of bone metabolism, arthroplasty, biomine were applied. Results. The technology of creating a 3D model of bones affected by malignant tumors has been developed based on the results of MRI, CT and 3D printing. Preoperative planning and training on 3D models reliably reduced intraoperative blood loss, duration of surgery, time of complete recovery of the extremity function, the risk of postoperative complications and, accordingly, increased the duration of the first recurrence-free period. The use of bone resorption and osteosynthesis markers allows to control the osseointegration of endoprosthesis and biomine, to diagnose recurrence/metastasis timely. Conclusions. The application of CT + MRI + 3D modeling + training on 3D models + tumor removal + arthroplasty + biomine algorithm provided functional results after 12 months: excellent — in 57.35 %, good — in 29.41 % of cases. Postoperative complications were observed only in 12.2 % of patients, local recurrences — in 7.3 %.","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"41 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81826839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of load in the sacroiliac joint during dynamic simulation of movements in the lumbar spine on skeletal muscle models after posterior bisegmental fusion","authors":"O. Barkov, R.V. Malyk, O. Karpinska","doi":"10.22141/1608-1706.2.24.2023.944","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.944","url":null,"abstract":"Background. Complications are the main concern of patients and surgeons when considering spine surgery. One of the risk factors for complications in the thoracic and lumbar spinal segments, as well as segments adjacent to those with fusion, is changes in sagittal spinal-pelvic balance. Objective: to determine the effect of muscle changes that occur during surgical access for posterior bisegmental LIV-SI fusion on the load of the iliac crest surface in the sacroiliac joint. Materials and methods. Dynamic motion simulation modeling was performed using OpenSim software with the use of additional programs to calculate loading forces. The complete model of the human musculoskeletal system was taken as a basis. To compare the load force, four models were created: 1 — basic, all spinal motion segments are fully functional, 2 — fixation without changing the anatomical curves of the spine, 3 — fixation in the position of hyperlordosis; 4 — fixation with reproduction of hyperlordosis. For models 2–4, changes in the muscles were made that correspond to the effects of surgical posterior access to the lumbar spine for posterior instrumented fusion LIV-SI. The load on the area of interest was measured as the value of the projection of the force vector depending on the angle of torso inclination as a percentage of body weight. Results. Muscle strength and function were the same for all types of instrumental spinal fusion, and trauma during access was not taken into account. In model 1 (normal) with the upright position, the projection of the load force falls on the center of gravity of the vertebra. When tilted, the load force in the sagittal direction acts exclusively on the anterior ilium with a slight shift of 10 % forward. In normosthenic and hyperlordotic fixation, there is a shift in the projection of the load force on the posterior iliac crest in the upright position and its displacement to the center with the tilt. The displacement of the load center with the upright position in normosthenic fixation is associated with the exclusion of some extensor muscles from the calculation of fibers, which reduces their total strength and leads to sagittal imbalance with an increase in lordosis. Hypolordotic fixation (model 4) slightly shifts the projection of the load force in the upright position (by 3 %) and approaches the normal values of model 1 when tilted. Regarding vertical loads, for all models with muscle integrity impairment (models 2, 3, 4), the load in the upright position is greatly increased — on average by 60 % compared to the norm, with a decrease in body weight by 40–45 % when tilted. Conclusions. It has been proved that the load force on the surface of the iliac crest in the sacroiliac joint depends on the angle of instrumental fusion performed. The greatest changes are observed with the displacement of the load center during upright standing in the sagittal direction. In normosthenic and hyperlordotic fixation with decreased back muscle strength","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"1 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79802057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of changes in the balance of the pelvic girdle muscles in patients with dysplastic coxarthrosis after arthroplasty","authors":"O. D. Karpinskaya, M.Y. Karpinsky, O. Tyazhelov, V. Klymovytskyy, L.D. Goncharova, D. Yurchenko","doi":"10.22141/1608-1706.2.24.2023.943","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.943","url":null,"abstract":"Background. Dysplastic coxarthrosis is a special medical and social problem in the treatment of adult patients, often leading to disability, limiting the human’s ability to self-care. Arthroplasty for dysplastic coxarthrosis is only a certain stage in the restoration of the patient’s musculoskeletal function. Considering the large number of unsatisfactory results of arthroplasty in dysplastic coxarthrosis, a very important factor is the construction of a rehabilitation prognosis — the estimated probability of achieving the intended goals of rehabilitation or realization of rehabilitation potential, taking into account disease features and the patient’s capabilities. Objective: to determine the significant parameters of the dysplastic hip joint whose change affects the deficit of lower limb muscle strength after arthroplasty and the prospects for rehabilitation potential. Materials and methods. An X-ray examination of 23 dysplastic hip joints was performed. The following radiometric parameters were measured: acetabular depth; floor thickness; acetabular depth index; abductor moment arm; gravity moment arm; height and lateralization of the center of rotation of the femoral head relative to the center of the acetabulum rotation. To objectify the balance of muscle forces required to maintain pelvic balance when standing on one leg, a mathematical model was used created by the authors, which reflects the pelvis with the femur and the action vectors of the muscles of two groups: abductors and adductors of the hip. Results. Using the model of horizontal balance of the pelvis, the level of muscle strength deficit was calculated in patients before and after arthroplasty. It was found that in some of them the muscle strength deficit remained. With a linear regression model, an equation was created to determine the muscle strength deficit. According to the statistical analysis, no difference was found between the results of the regression equation and the mathematical model (p &gt;&gt; 0.05). The regression analysis has shown that the most significant factors for the result are the neck shaft angle, floor thickness, and head height. To determine the limits of radiometric parameters that affect the outcome of arthroplasty, patients were divided into 4 groups according to the level of calculated muscle strength deficit: group I — deficit of more than 20 %, group II — deficit of less than 20 %, group III — surplus of 20 % and group IV — surplus of more than 20 %. In general, patients improve their muscle strength, but the initial deficit greatly affects the outcome after arthroplasty. For patients in group I, pre- and postoperative rehabilitation is necessary to achieve a positive result. In group II, the main direction of rehabilitation is to increase muscle strength. For patients of groups III and IV, general rehabilitation measures can be used. Conclusions. The most important parameter that affects muscle strength after arthroplasty is the patient’s muscle streng","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"68 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79546280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of low-frequency vibration on the restoration of the range of knee motion in laboratory animals after immobilization (experimental study)","authors":"O. Tyazhelov, O. Karpinska, M. Karpinsky, O.A. Nikolchenko, V. Fishchenko, Khasawneh Ayham Adli Mohammad","doi":"10.22141/1608-1706.2.24.2023.941","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.941","url":null,"abstract":"Background. The term “joint contractures” is used to describe the loss of passive range of motion of diarthrosis joints, the most common and mobile type of a joint. Measuring passive or active range of motion in a joint with contracture is key to assessing the severity of joint contractures. The purpose of the study: to determine the impact of immobilization on the development of movement limitation in the knee joint of laboratory animals (rats) and to evaluate the possibility of restoring mobility in case of using low-frequency vibration during and after immobilization. Materials and methods. The experimental study was conducted on 30 non-linear white male rats aged 6 months. Immobilization of the pelvic limb was performed at an angle of 140° in the knee joint. The animals were randomly divided into 3 groups: I — immobilization and free restraint after immobilization, II — immobilization and vibration development of the joint after immobilization, III — immobilization and vibration development of the joint during and after immobilization. Vibration development of the immobilized knee joint was performed daily in the mode of 20 Hz with an amplitude of 1.5 mm and a duration of 10 minutes. The range of motion and real contracture were determined as the difference between the measured range of motion and the range of motion before the start of the experiment for each animal individually. Results. It was found that a rapid increase in movement limitation occurs starting from the 2nd week of immobilization. A decrease in the range of motion in rats of the groups I and II under conditions of immobilization occurred the same way. After the end of immobilization, a slow increase in the range of motion was observed in the group I; in the group II, the growth was almost linear and after 4 weeks, the indicator was close to the norm. In the group III, the limitation of the range of motion after immobilization was significantly less; therefore, accordingly, recovery took place already 2 weeks after the removal of the immobilization bandage. Immobilization of the knee joint in rats of groups I and II caused a contracture of 60°, while in the group III, the restrictions did not exceed 25°. And, accordingly, the recovery in the groups with vibration development was rapid; in the group III, a full recovery was achieved, in the group II — a recovery of up to 5° of the residual contracture. In the group I, we observe a residual contracture of almost 35°, which is more than the formed immobilization contracture in the group III. Conclusions. Low-frequency vibration allows reducing the impact of immobilization and significantly accelerate the recovery of mobi-lity (range of motion) of the joint after its completion. If it is impossible to carry out vibrotherapy during the period of immobilization, it should be started as early as possible after immobilization. To date, there are few studies considering the effect of low-frequency vibration on the development of immob","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"15 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77026819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the stress-strain state of the posterior lumbar fusion models in case of normal indicators of the sagittal balance of the spine and pelvis","authors":"K. Popsuyshapka, O.V. Kovernyk, O.O. Pidgayska, M. Karpinsky, O. Yaresko","doi":"10.22141/1608-1706.2.24.2023.939","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.939","url":null,"abstract":"Background. Patients suffering from hip-spine syndrome with significant changes in the hip joint complain of pain in the lumbar spine in 21.2–49.4 % of cases. After performing lumbar fusion, the mobility of the pelvis decreases, which leads to an increased risk of dislocations and the development of impingement after hip arthroplasty that is the cause for repeated surgical interventions. Goal: to study the stress distribution in the models of posterior lumbar fusion in case of normal values of the sagittal contour of the spine and lumbar lordosis. Materials and methods. A finite-element model has been developed reflecting the condition that occurs in the combined course of degenerative diseases of the lumbar spine and hip joint and is characterized by normal lordosis of 40º and forward body tilt due to flexion contracture in the hip joints. The following options were modeled: 1 — posterior fusion of the L4-L5 vertebrae using a transpedicular structure with 4 screws and an interbody support; 2 — posterior fusion of the L3-L4-L5 vertebrae using a transpedicular construction with 6 screws; 3 — posterior fusion of L1-L5 vertebrae using a transpedicular structure with 10 screws. When conducting the research, the values of stresses in the Th1-L5 vertebrae, on the screws and rods of the transpedicular structure were studied. Results. Posterior fusion with a transpedicular construction on two L4-L5 vertebrae leads to the occurrence of maximum stresses in vertebral bodies of the lumbar spine, especially L4-L5. The lowest stresses in the lumbar vertebral bodies can be obtained when the transpedicular structure is applied to all 5 vertebrae. The use of all options for posterior fusion, except for the 4-screw scheme, allows to reduce the stress in the vertebral arches of the lumbar spine below the level of the normal spine model, except for the L1 vertebra. This leads to an increase in the level of stress from the Th6 to Th12 vertebrae. The construction placed on all 5 vertebrae ensures the lowest level of stress in the arches of thoracic vertebrae. The construction placed on all the vertebrae of the lumbar spine provides a minimum level of stress in the bone tissue around the fixing screws. Reducing the length of fixation leads to a significant increase in stress in these zones. With all types of installation of the transpedicular construction, the values of the stresses on the screws in the L3-L5 vertebrae are comparable. When using the design for 5 vertebrae of the lumbar spine, the locking screws in the L1 and L2 vertebrae will experience significant loads, which, accordingly, will cause significant stress in them. The maximum level of stress in the rods occurs when two L4-L5 vertebrae are instrumented, the minimum is when the structure is placed on all five vertebrae of the lumbar spine. Conclusions. Given the stress distribution, the length of fixation plays an important role: the longer the length of fixation, the lower the stress level, both in the b","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"43 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81282202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of bone density according to СT data before and in the remote period after unicondylar knee arthroplasty","authors":"Wahbeh Rami Taleb Khaled, S.Y. Yaremin","doi":"10.22141/1608-1706.2.24.2023.942","DOIUrl":"https://doi.org/10.22141/1608-1706.2.24.2023.942","url":null,"abstract":"Background. Unicondylar knee arthroplasty has become popular among orthopedists in recent years. The main complication of this technology is the instability of the tibial component of the endoprosthesis due to the development of local osteoporosis in the area of arthroplasty. Patients with decreased bone density are at high risk of developing instability of the tibial component of the endoprosthesis. Therefore, determining the levels of bone mineral density in patients with osteopenia before arthroplasty make it possible to calculate the risk of complications in the long term. Objective: to evaluate the bone mineral density according to the computed tomography (CT) of the tibial plateau resection zone for unicondylar arthroplasty in patients at risk. Materials and methods. The state of three cortical layer zones was assessed: anterior, middle, posterior and 4 zones of the plateau cut plane. The optical density of bone tissue was measured on CT images of the tibial plateau of the knee joint using the Hounsfield scale. Changes in bone structures in the area of placing tibial component of the endoprosthesis were studied in 2 groups of patients: group I — ten individuals who had undergone unicondylar knee arthroplasty 3–6 years ago and complained of negative phenomena in the prosthetic knee, group II — ten patients who had undergone unicondylar arthroplasty 1.2–2 years ago. These patients underwent CT densitometry at the follow-up examination. Results. Before arthroplasty, the maximum optical density of bone tissue was statistically the same. The density of the cortical layer was maximal in the anterior part of the bone (~ 720 HU), minimal — in the posterior part (580 HU). For the spongy bone zone, the maximum optical density was observed in the anterior part (~ 470 HU), and in the posterior part, it was lower. In 3–6 years, patients of group I showed a significant decrease in the optical density of the bone, both in its cortical layer and in the cancellous tissue. The greatest losses were detected in the medial zones of the cancellous bone. Patients had areas of cortical layer resorption, and in some individuals, its complete absence. At the same time, the absorption index of the cortical layer in the areas of destruction did not exceed 100 HU. The maximum optical density of the cortical layer in the zones also decreased. In patients of group II, 1.5–2 years after arthroplasty, there were no noticeable changes in the bone structures in the surgery area. Changes occurred in the medial zones of the cancellous bone of the tibial plateau. Patients with osteopenia reported changes in bone optical density already in the first years after arthroplasty, although they do not lead to instability of the tibial component of the endoprosthesis. Conclusions. Patients with decreased bone density (osteopenia) during joint arthroplasty are at risk of developing local osteoporosis in the area of bone resection. The first signs of resorption of the cancellous bone can","PeriodicalId":9553,"journal":{"name":"Burns & Trauma","volume":"51 1","pages":""},"PeriodicalIF":5.3,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76381208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}