جستجوی مقالات مرتبط با کلیدواژه « knee joint » در نشریات گروه « پزشکی »

This study aims to investigate the effects of an eight-week sensorimotor training (SMT) program with visual feedback (VF) on knee joint proprioception and alignment in women with dynamic knee valgus (DKV).

In this quasi-experimental study, 30 women with DKV were selected and randomly divided into two groups (intervention and control groups) of 15 participants each. The intervention group underwent an eight-week VF-based SMT program consisting of three sessions lasting 60 minutes each week. Meanwhile, the control group continued with their daily routine during this period. After the training, all participants’ knee joint proprioception and alignment were assessed using the single-leg squat test (SLST) and single-leg landing test (SLLT). The results were analyzed using the analysis of covariance (ANCOVA) in the IBM SPSS Statistics software, version 26, with a significance level of P<0.05.

The analysis of covariance (ANCOVA) results indicated a significant improvement in proprioception (P=0.038) and knee alignment (P=0.001) in the intervention group compared to the control group.

The study suggests that practicing SMT with VF can enhance knee joint proprioception and alignment in women with DKV.

The anterior cruciate ligament (ACL) is a vital knee joint stabilizer with rising injury rates. Anatomic ACL reconstruction (ACLR) aims to restore the ACL to its original dimensions, collagen orientation, and insertion sites, but complete restoration may not be possible. Suture augmentation (SA) involves the use of autologous hamstring tendons with a braided ultra-high molecular weight polyester or polyethylene (UHMWPE) suture or suture tape to act as a secondary stabilizer until complete integration. This study aimed to compare the outcomes of ACLR using hamstring grafts with and without SA.

This trial was conducted at a tertiary-level health care center, with 50 patients divided randomly into two groups: 25 patients for standard ACLR (group A) and25 patients for ACLR with SA (group B). Participants provided informed consent. Baseline clinical characteristics including range of motion (ROM), pain [Numeric Pain Rating Scale (NPRS)], and functional outcomes [Lysholm and International Knee Documentation Committee (IKDC) scores] were collected.

The mean age was 25.5 years, with 96% male and 4% female participants. A statistically significant improvement was found in both groups in ROM, NPRS scores, and functional outcomes at 1 and 6 months. There was no significant difference in both groups regarding the IKDC score. Lysholm’s score showed a remarkable improvement in both groups.

SA could be an effective technique for ACLR, with comparable outcomes to standard ACLR.

Septic arthritis is an uncommon condition in neonates. It is a serious disorder, especially because of the possibility of sequelae, if not identified and treated early. In addition, due to the rarity of this condition in neonates and the paucity of signs and symptoms, the diagnosis of septic arthritis is more difficult in older children. The published literature is limited to case series, which is why the purpose of this systematic review is to provide a comprehensive summary of neonatal septic arthritis based on the existing literature. This study identifies the changing trends over time, specifically focusing on intravenous cannulation as a major risk factor that led to the undertaking of the study.

The preferred reporting items for systematic reviews and meta-analyses protocol guidelines were used in this study. Three search engines were used for 239 articles. A total of 26 studies were screened in full text, of which 16 articles underwent quantitative analysis. Due to limited data and heterogeneous reporting, the data were summarized descriptively.

The total number of babies and joints studied was 307 and 313, respectively, of which the proportion of male babies was mentioned in 12 case series, accounting for 136(228) (60% [42%-71%]) subjects. The most common presenting symptoms were swelling at the involved joint, erythema, and decreased range of motion in variable order. The most common site of involvement was the hip joint (42%), followed by the knee joint (27%). Staphylococcus aureus (40%) was the most commonly cultured pathogen, followed by Klebsiella (18%). Antibiotics were reported in only 12% (38 babies) of the cases. Open surgery was performed on 16% of the 49 babies. The rest of the babies responded to joint aspiration and irrigation, with or without immobilization. Prompt laboratory and radiographic evaluations could help reduce delays in diagnosis and improve outcomes. Blood and tissue cultures were positive in most of the cases. Previous culture reports for the same unit guide the addition of empirical antibiotics.

In our case series, the majority of the babies were premature. The most common joint involved is the hip joint. The most common underlying cause is sepsis and catheterization. Intravenous canulation is also a major risk factor because of the continuity of metaphysis and epiphysial vessels. The most common presenting symptom is local signs. Unexplained fever and irritability make it better to look for a local examination of joints. Follow-up is mandatory as a long-term sequel is more.

Military boots mileage is a main factor that can affect the risk of running injuries. The present study aims to evaluate the effect of three types of military boots mileage on knee muscular co-contraction during running.

Fifteen healthy males received three pairs of new military boots. Participants wore these boots for more than 6 months. Electromyography activity of lower limb muscles during running at constant speed was recorded during pre- and post-intervention. Then, knee muscular co-contraction was calculated.

Results showed a significant increase during loading response (P=0.030, n2p=0.157) and push-off (P=0.008, n2p=0.302) phases for general knee co-contraction at post-test compared to the pre-test. Also, directed mediolateral knee co-contraction showed a significant increment during mid-stance (P=0.028, n2p=0.040) and push-off (P=0.039, n2p=0.115) phases at post-test compared to the pre-test. 

It can be concluded that knee joint instability while using polyurethane thermoplastic is more than polyurethane boots. Also, our results demonstrated that maintaining knee stability in the anterior-posterior direction while using polyurethane thermoplastic is better than in polyurethane boots.

Flexibility or the ability of a muscle to increase in length is an integral part of musculoskeletal characteristics and is essential in preventing musculoskeletal injuries and increasing functional levels. Hamstring muscles rupture is a common injury. One of the important factors in the occurrence of this injury is poor hamstring muscle flexibility, which because of its stiffened structure, has less ability to quickly increase in length. Some researchers have recently suggested that the dry needling technique could reduce the number of treatment sessions for hamstring muscle tightness and bring faster and more effective results. Accordingly, this study aims to investigate the effect of the application of dry needling through an acupuncture technique on hamstring muscle flexibility.

The present study is a single-blinded randomized controlled trial in which 16 individuals with bilateral hamstring muscle shortness were randomly allocated into dry-needling and sham-needling groups. The sampling method was non-probability convenience. The outcome measures were the right and left active knee extension range of motion, assessed before and after the first, third, and fifth sessions of intervention. A 2-factor mixed analysis of variance was applied to determine the differences between and within the two groups.

Except for the group main effect, time main effect and interaction effect were statistically significant for the right and left active knee extension range of motion (P<0.001). There were differences in behavioral patterns in groups; accordingly, in the real dry-needling group, a significant difference was detected across times. However, in the sham dry-needling group, no significant difference was observed.

The application of dry needling into motor points of hamstring muscles in individuals with bilateral hamstring muscles shortness could improve flexibility and increase the range of knee extension after 3 and 5 sessions of intervention because of the therapeutic effects of the dry needling technique in improving the muscle flexibility.

This article presents a mathematical justification for a new approach to arthroscopic stitching of the knee joint meniscus, based on a 3D computer model of the meniscus developed using the COMPASS-3D (APMFEM) program and AutodeskInventorPRO. The research with the patent RK No. 35413 dated 10.12.2021, titled "Method of arthroscopic stitching of the meniscus of the knee joint" builds upon the work of Yu.V. Labunsky.

Mathematical analysis was performed to compare two methods of stitching the meniscus: the new oblique-vertical stitch and the classical vertical stitch. The contact area of the meniscus tissues in the area of the rupture was measured for both stitching methods.

The findings demonstrate that the new oblique-vertical stitch offers a 1.5 times larger contact area of the meniscus tissues in the area of the rupture, compared to the classical vertical stitch. Additionally, the new method provides a more significant grip on the radial and circular fibers of the meniscus, surpassing the capabilities of the classic seam.

The results of this study can be utilized to develop practical recommendations for traumatologists regarding arthroscopic stitching of the meniscus in the knee joint. The new approach, supported by mathematical analysis and a 3D computer model, offers improved outcomes in terms of contact area and grip on the meniscus fibers, potentially leading to enhanced surgical techniques and patient outcomes.

Musculoskeletal systems have a complex nature, and it is very difficult to control issues in these systems due to various characteristics such as speed and accuracy. Thus, investigating these musculoskeletal systems requires simple and analyzable methods. Also, due to sudden changes during the movement process, the speed and accuracy of the calculations should be proportional to the operating speed of the system. Predicting the system norms and fulfilling them for the system are the next challenges for relevant studies.

Accordingly, this study aimed to investigate the knee joint function, the joint condition in an incomplete Spinal Cord Injury (SCI), as well as its rehabilitation conditions by designing a simple mathematical model. This model was designed based on the interactions between Hamstring Muscles (HAM) and the vasti muscle group. Considering changes in the Central Pattern Generator (CPG) as a variable input, we analyzed the model output in fixed point, periodic and chaotic modes.

The results of the present study showed that the knee joint model output was a chaotic and fixed point for the healthy and incomplete SCI modes, respectively. Increasing the values of afferents was enhanced in the central pattern generating model to rehabilitate the model. According to the modeling results, by applying coefficients of 1.98, 2.21, and 3.1 to the values of afferents Ia, II and Ib, the incomplete spinal injury model changed permanently from the fixed point to the periodic position, indicating movement with rehabilitation in the knee joint.

Based on the results obtained from the knee joint mathematical model in comparison with the reference articles in relation to the expected results, it can be stated that this model has an acceptable output while being simple in calculations and has the ability to predict different norms. It can also be hoped that improved and more detailed results will be achieved in the study of musculoskeletal systems with the development of this model .

The present study provides an analysis of methods in assessment and measurement of knee arthrokinematic movements.

in this study, an exhaustive review of the methods for assessment of knee joint arthrokinematics is provided. For this, some known databases including Science Direct, PubMed, EMBASE, CINAHL, and Google Scholar, for the period 1985 to February 2020 are explored.

After the assessment steps, 14 articles were chosen based on the criteria and objectives of the research; 13 articles in entirety and one as a summary. Through a review of the studies, it was observed that various methods were used in assessment and measurement of the knee joint arthrokinematic movements. In the beginning, focus was on transitional motion in which knee arthrokinematic movements were studied in static state; but with time, knee transitional movement was studied in dynamic state as well. More recent studies scrutinized three main types of arthrokinematics: motion rolling, gliding and spinning. There were also studies that tried to implement tools which required minimum cost and scrutinized the knee arthrokinematic movements without complicated state-of-the-art equipment. All the said equipment were designed with the aim of diagnosis of how the arthrokinematic movements of an injured knee compared to a healthy one.

Results of our analysis show that the literature is rich with a variety of instruments for measuring knee arthrokinematic movements. By classifying the instruments, it was found that studies of four different measurement methods including static, dynamic, functional and qualitative have examined the arthrokinematic movements of the knee.

Knee Osteoarthritis (OA) is one of the most important etiologies of pain and disability among adults. The effects of pulsed Ultrasound (US) on pain reduction and joint function have been proven, but its role on joint friction and inflammatory mediators is still unclear. Therefore, this study was designed to investigate the effects of US on knee joint friction and inflammation in non-traumatic experimental knee OA.

Forty-eight guinea pigs were randomly assigned into four groups: OA+US, OA+US sham, 30 days after OA induction (OA30), and normal control (n=12 for each group). OA was induced by intra-articular injection of 3 mg/kg of Mono-Iodoacetate (MIA) in the animal’s left knee. Joint circumstance and weight of the animals were measured at baseline, before (i.e., after 30 days of MIA injection), and after US treatment. Joint friction was evaluated by a pendulum friction tester system. Cytokine levels, including Tumor Necrosis Factor (TNF)-α and Interleukin (IL)-1β, were measured by the ELISA method. The Pearson correlation coefficient was calculated to study the relationships between friction and inflammation variables.

Joint circumference was increased in the OA30 group. Joint friction variables, including exponential curve fitting, cycle number, and friction coefficient, were significantly better in the US group (P<0.05). TNF-α and IL-1β cytokine levels were significantly lower in the US group. A significant positive correlation was observed between joint friction indices and TNF-α and IL-1β cytokine levels (P<0.05).

US was an effective approach for reducing joint friction and inflammation in OA30. Moreover, the relationship between knee joint friction and inflammation could help us better understand the etiology, mechanism, and treatment strategies of this disease.

Diminished proprioception after an anterior cruciate ligament (ACL) rupture causes disabilities following injury. The aim of this study was to investigate the trend of this change during six months following an isolated unilateral complete ACL rupture.

In this cohort study, a total of 58 male and female athletes, aged 20-40 years, were surveyed in equal groups with 29 subjects. The healthy (first) and ACLD (second) groups included athletes with isolated unilateral complete ACL ruptures (the ACL-deficient knee group). Knee proprioception was investigated in both groups in three stages, namely, at the beginning of the study (two months after the injury in the ACL-D group) and the intervals of two and four months after the first assessment. The active reproduction of passive positioning (ARPP) method was used in this study. The selected angles were 45° and 60° of knee flexion, and an isokinetic device was the measuring instrument. Three reproduction angular errors were compared between three measurements in each test, including constant error (CE), absolute error (AE), and variable error (VE).

The results showed that AE and VE, unlike CE, significantly changed within both groups. AE (P ≤ 0.002, P ≤ 0.001 for 45° and 60°, respectively) and VE (P ≤ 0.043 for 45°), as well as AE (P ≤ 0.002, P ≤ 0.001 for 45°and 60°, respectively) and VE (P ≤ 0.005, P ≤ 0.016 for 45° and 60°, respectively) were significant in the healthy and ACL-D groups, respectively. In addition, a significant difference was observed between healthy and ACL-D groups regarding knee proprioception. At 45°, CE, AE, and VE were significant in the first (P ≤ 0.024), the third (P ≤ 0.014), and all three (P ≤ 0.001, P ≤ 0.027, & P ≤ 0.001) tests, respectively. Finally, AE, VE, and CE were found to be significant in the second (P ≤ 0.001), second (P ≤ 0.004), and third (P ≤ 0.026) tests, at 60°, respectively.

In general, ACL rupture reduced knee proprioception after the injury in athletes compared to healthy individuals. Within-group differences, as well as differences between healthy and injured athletes diminished over time within six months after the injury. Eventually, knee proprioception improved in individuals with ACL rupture although the exact mechanism of these changes remains unknown

Rheumatoid arthritis (RA) is a chronic inflammatory joint disease that causes chronic synovial inflammation. Reactor-producedβ-particle emitting radionuclides is a new therapeutic strategy in the management of RA. This study was conducted in 2019and analyzed the toxicity and feasibility of 188Re-tin colloid injection, Three-Phase Positive Bone Scan, and Refractory KneePain. Ten patients with RA were administered radiosynovectomy with 188Re-tin colloid. The main complications after theintervention were assessed and compared with patients’ pre-intervention condition. Patients showed alleviation of pain,tenderness, and morning stiffness after the administration of radiosynovectomy. Only one RA patient received a corticosteroidinjection; the other 6 patients did not need a corticosteroid injection after radiosynovectomy. Intra-articular 188Re-tin colloidinjection seems to be an effective treatment modality for refractory knee joint pain in rheumatoid arthritis patients. Thus, it issuggested as a safe and effective strategy to apply.