scholarly journals The extent and risk of knee injuries in children aged 9–14 with Generalised Joint Hypermobility and knee joint hypermobility - the CHAMPS-study Denmark

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Tina Junge ◽  
Lisbeth Runge Larsen ◽  
Birgit Juul-Kristensen ◽  
Niels Wedderkopp
Keyword(s):  
Knee Joint ◽  
Knee Injuries ◽  
Joint Hypermobility

Dynamic Response Analyses of Rabbit Knee Joint

1999 ◽  
Author(s):  
M. Kasra ◽  
M. D. Grynpas ◽  
A. Shirazi-Adl
Keyword(s):  
Knee Joint ◽  
Dynamic System ◽  
Experimental Studies ◽  
Knee Injuries ◽  
Nonlinear Dynamic System ◽  
Rabbit Knee ◽  
Prediction And Prevention ◽  
Joint Load ◽  
Dynamic Loading Conditions ◽  
Knee Disorders

Abstract The knee joint is a complex nonlinear dynamic system. It is generally known that mechanical factors play an important role in the etiology of knee injuries and diseases such as osteoarthritis. While performing daily activities such as walking, running, and climbing as well as during occupational operations, the joint is exposed to vibrations and multiple impacts. During these activities, according to an individual’s condition (e.g., age, fitness, weight), the joint load and stiffness may reach critical limits initiating or accelerating different knee disorders. This is the case in athletes or workers during occupational activities (1). Therefore, understanding the dynamic characteristics of the knee joint is essential in prediction and prevention of knee disorders as well as in subsequent joint replacement and rehabilitation procedures. There have been very few reported experimental studies investigating the dynamic behavior of the whole knee joint as a dynamic system (2). The objective of this study was to investigate the changes in mechanical properties of the rabbit knee joint under different compressive dynamic loading conditions. Rabbit has frequently been used as an osteoarthritic knee model (3). The data obtained in this study, hence, will also be beneficial in our future studies of osteoarthritic rabbit models.

Knee joint dislocation: overview and current concepts

2021 ◽  
pp. 1-10
Author(s):  
Fitzgerald C Anazor ◽  
Kwaku Baryeh ◽  
Neville C Davies
Keyword(s):  
Knee Joint ◽  
Functional Limitation ◽  
Knee Injuries ◽  
X Rays ◽  
Specialist Care ◽  
Ligament Repair ◽  
Joint Dislocation ◽  
High Index Of Suspicion ◽  
Knee Dislocations

Knee joint dislocation is a relatively uncommon injury but its management is important because of the associated high risk of vascular, neurological and multi-ligamentous knee injuries. Clinicians must be aware that not all knee dislocations are diagnosed on plain X-rays; a high index of suspicion is required based on clinical evaluation. Multidisciplinary specialist care is required in all cases to achieve best outcomes. Early one-stage or multiple staged ligament repair and reconstruction offer better outcomes, but most patients have some long-term functional limitation. This article provides insights into the epidemiology and management of this injury and its devastating effects.

scholarly journals Simulation Analysis of Knee Ligaments in the Landing Phase of Freestyle Skiing Aerial

2019 ◽  
Vol 9 (18) ◽  
pp. 3713 ◽  
Author(s):  
Yanming Fu ◽  
Xin Wang ◽  
Tianbiao Yu
Keyword(s):  
Knee Joint ◽  
Mechanical Response ◽  
Simulation Analysis ◽  
Cruciate Ligament ◽  
Knee Injuries ◽  
Element Model ◽  
Knee Joints ◽  
Internal Stresses ◽  
Risk Of Injury ◽  
Medium Risk

The risk of knee injuries in freestyle skiing athletes that perform aerials is high. The internal stresses in the knee joints of these athletes cannot easily be directly measured. In order to ascertain the mechanical response of knee joints during the landing phase, and to explore the mechanism of damage to the cartilage and ligaments, a finite element model of the knee joint was established. Three successful landing conditions (neutral, backward, or forward landing) from a triple kicker were analyzed. The results demonstrate that the risk of cruciate ligament damage during a neutral landing was lowest. A forward landing carried medium risk, while backward landing was of highest risk. Backward and forward landing carried risk of injury to the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL), respectively. The magnitude of stress on the meniscus and cartilage varied for all three landing scenarios. Stress was largest during neutral landing and least in backward landing, while forward landing resulted in a medium level of stress. The results also provide the basis for training that is scientifically robust so as to reduce the risk of injury and assist in the development of a professional knee joint protector.

scholarly journals MR Imaging of Intra- and Periarticular Cyst-Like Lesions of the Knee Joint in Workers with Occupational Kneeling

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Søren Rytter ◽  
Lilli Kirkeskov Jensen ◽  
Jens Peter Bonde ◽  
Niels Egund
Keyword(s):  
Knee Joint ◽  
Regression Models ◽  
Anterior Part ◽  
Knee Injuries ◽  
Posterior Part ◽  
Popliteus Tendon ◽  
Cystic Lesions ◽  
Logistic Regression Models ◽  
Significant Difference ◽  
Fluid Collections

Objective. To determine the risk of intra- and periarticular cyst-like lesions of the knee joint in occupational kneeling.Methods. Magnetic resonance imaging of both knees (n=282) was conducted in 92 male floor layers and 49 male graphic designers (referents), with a mean age of 55.6 years (range 42–70 years). The prevalence of cyst-like lesions was computed among floor layers and graphic designers, respectively, and associations with occupation summarized by odds ratio (OR) with 95% confidence intervals (CIs). Using logistic regression, models were adjusted for age, body mass index, knee injuries, and knee-straining sports.Results. Floor layers had a significantly higher prevalence of cyst-like lesions in the posterior part of the knee joint compared to graphic designers (OR 2.70, 95% CI 1.50–4.84). Floor layers also had a higher prevalence of fluid collections in the popliteus tendon recess (OR 2.17, 95% CI 0.99–4.77) and large cystic lesions of the popliteus muscle (OR 3.83, 95% CI 0.78–18.89). The prevalence of cystic lesions in the anterior part of the knee joint was low among floor layers (8.7%) and there was no significant difference between the two trade groups (P=0.34).Conclusions. Occupational kneeling increases the risk of cyst-like lesions in the posterior part of the knee joint.

scholarly journals Vibration Characterization of the Human Knee Joint in Audible Frequencies

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4138
Author(s):  
Mohsen Safaei ◽  
Nicholas B. Bolus ◽  
Alper Erturk ◽  
Omer T. Inan
Keyword(s):  
Knee Joint ◽  
Modal Analysis ◽  
Sagittal Plane ◽  
Knee Injuries ◽  
Acoustic Emissions ◽  
Older Individuals ◽  
Human Knee ◽  
Human Knee Joint ◽  
Diagnostic Potential ◽  
Diagnostic Applications

Injuries and disorders affecting the knee joint are very common in athletes and older individuals. Passive and active vibration methods, such as acoustic emissions and modal analysis, are extensively used in both industry and the medical field to diagnose structural faults and disorders. To maximize the diagnostic potential of such vibration methods for knee injuries and disorders, a better understanding of the vibroacoustic characteristics of the knee must be developed. In this study, the linearity and vibration transmissibility of the human knee were investigated based on measurements collected on healthy subjects. Different subjects exhibit a substantially different transmissibility behavior due to variances in subject-specific knee structures. Moreover, the vibration behaviors of various subjects’ knees at different leg positions were compared. Variation in sagittal-plane knee angle alters the transmissibility of the joint, while the overall shape of the transmissibility diagrams remains similar. The results demonstrate that an adjusted stimulation signal at frequencies higher than 3 kHz has the potential to be employed in diagnostic applications that are related to knee joint health. This work can pave the way for future studies aimed at employing acoustic emission and modal analysis approaches for knee health monitoring outside of clinical settings, such as for field-deployable diagnostics.

scholarly journals Neuromuscular Function of the Knee Joint Following Knee Injuries: Does It Ever Get Back to Normal? A Systematic Review with Meta-Analyses

2020 ◽  
Author(s):  
Beyza Tayfur ◽  
Chedsada Charuphongsa ◽  
Dylan Morrissey ◽  
Stuart Charles Miller
Keyword(s):  
Systematic Review ◽  
Knee Joint ◽  
Strong Evidence ◽  
Knee Injuries ◽  
Neuromuscular Function ◽  
Spinal Reflex ◽  
Voluntary Activation ◽  
Moderate Evidence ◽  
Reflex Excitability ◽  
Meta Analyses

Abstract Background Neuromuscular deficits are common following knee injuries and may contribute to early-onset post-traumatic osteoarthritis, likely mediated through quadriceps dysfunction. Objective To identify how peri-articular neuromuscular function changes over time after knee injury and surgery. Design Systematic review with meta-analyses. Data Sources PubMed, Web of Science, Embase, Scopus, CENTRAL (Trials). Eligibility Criteria for Selecting Studies Moderate and high-quality studies comparing neuromuscular function of muscles crossing the knee joint between a knee-injured population (ligamentous, meniscal, osteochondral lesions) and healthy controls. Outcomes included normalized isokinetic strength, muscle size, voluntary activation, cortical and spinal-reflex excitability, and other torque related outcomes. Results A total of 46 studies of anterior cruciate ligament (ACL) and five of meniscal injury were included. For ACL injury, strength and voluntary activation deficits were evident (moderate to strong evidence). Cortical excitability was not affected at < 6 months (moderate evidence) but decreased at 24+ months (moderate evidence). Spinal-reflex excitability did not change at < 6 months (moderate evidence) but increased at 24+ months (strong evidence). We also found deficits in torque variability, rate of torque development, and electromechanical delay (very limited to moderate evidence). For meniscus injury, strength deficits were evident only in the short-term. No studies reported gastrocnemius, soleus or popliteus muscle outcomes for either injury. No studies were found for other ligamentous or chondral injuries. Conclusions Neuromuscular deficits persist for years post-injury/surgery, though the majority of evidence is from ACL injured populations. Muscle strength deficits are accompanied by neural alterations and changes in control and timing of muscle force, but more studies are needed to fill the evidence gaps we have identified. Better characterisation and therapeutic strategies addressing these deficits could improve rehabilitation outcomes, and potentially prevent PTOA. Trial Registration Number PROSPERO CRD42019141850.

Design and Evaluation of a Multi-Degree-of-Freedom Foot/Pedal Interface for Cycling

1992 ◽  
Vol 8 (2) ◽  
pp. 152-164 ◽  
Author(s):  
Dennis Wootten ◽  
Maury L. Hull
Keyword(s):  
Knee Joint ◽  
Significant Interaction ◽  
Degrees Of Freedom ◽  
Knee Injuries ◽  
Degree Of Freedom ◽  
Two Degrees Of Freedom ◽  
Factors Affecting ◽  
Freedom Of Movement ◽  
Sample Data ◽  
Comprehensive Study

Described is the design of a foot/pedal interface intended as a research tool in the study of overuse knee injuries in cycling. The interface enables the systematic variation of factors that may affect loads transmitted by the knee joint. It permits two degrees of freedom of movement, inversion/eversion and abduction/adduction rotations, either separately or in combination. The movement permitted by each degree of freedom can be either free or resisted by spring assemblies. Sample data were collected to demonstrate the function of the foot/pedal interface. With no spring resistance, the interface functioned as intended by allowing free movement of the foot. Significant interaction was seen between the two degrees of freedom, with more motion and a larger absolute mean occurring when both degrees of freedom were allowed simultaneously. This emphasizes the need for a multi-degree-of-freedom interface when undertaking a comprehensive study of the factors affecting loads transmitted by the knee.

scholarly journals Biomechanical Study of a Tricompartmental Unloader Brace for Patellofemoral or Multicompartment Knee Osteoarthritis

2021 ◽  
Vol 8 ◽  
Author(s):  
Chris A. McGibbon ◽  
Scott Brandon ◽  
Emily L. Bishop ◽  
Chris Cowper-Smith ◽  
Edmund N. Biden
Keyword(s):  
Knee Joint ◽  
Knee Flexion ◽  
Sagittal Plane ◽  
Weight Bearing ◽  
Knee Injuries ◽  
Statistical Parameter ◽  
Quadriceps Tendon ◽  
Biomechanical Study ◽  
Contact Forces ◽  
Joint Force

Objective: Off-loader knee braces have traditionally focused on redistributing loads away from either the medial or lateral tibiofemoral (TF) compartments. In this article, we study the potential of a novel “tricompartment unloader” (TCU) knee brace intended to simultaneously unload both the patellofemoral (PF) and TF joints during knee flexion. Three different models of the TCU brace are evaluated for their potential to unload the knee joint.Methods: A sagittal plane model of the knee was used to compute PF and TF contact forces, patellar and quadriceps tendon forces, and forces in the anterior and posterior cruciate ligaments during a deep knee bend (DKB) test using motion analysis data from eight participants. Forces were computed for the observed (no brace) and simulated braced conditions. A sensitivity and validity analysis was conducted to determine the valid output range for the model, and Statistical Parameter Mapping was used to quantify the effectual region of the different TCU brace models.Results: PF and TF joint force calculations were valid between ~0 and 100 degrees of flexion. All three simulated brace models significantly (p &lt; 0.001) reduced predicted knee joint loads (by 30–50%) across all structures, at knee flexion angles &gt;~30 degrees during DKB.Conclusions: The TCU brace is predicted to reduce PF and TF knee joint contact loads during weight-bearing activity requiring knee flexion angles between 30 and 100 degrees; this effect may be clinically beneficial for pain reduction or rehabilitation from common knee injuries or joint disorders. Future work is needed to assess the range of possible clinical and prophylactic benefits of the TCU brace.

Wearable Monitoring and Predicting System for Knee Joint Fatigue Based on Curvature and Pressure Sensing (Preprint)

2020 ◽  
Author(s):  
Jiawei Xin ◽  
Jialun Chen ◽  
Xuanyu Huang ◽  
Xiaodong Pan ◽  
Tengyue Zou
Keyword(s):  
Knee Joint ◽  
Embedded System ◽  
Knee Injuries ◽  
Human Perception ◽  
Table Tennis ◽  
Embedded Devices ◽  
Excessive Exercise ◽  
Fitting Method ◽  
Curve Fitting Method ◽  
The One

BACKGROUND Knee injury is always a trouble for people in daily life. It not only threatens the career of an athlete but also affects a normal engineer through morning running. The injury of the knee joint is found to be directly related to the fatigue caused by excessive exercise. OBJECTIVE The aim of the study was to explore the use of wearable embedded devices to monitor and predict the fatigue degree of the knee joint during exercise, so as to prevent the knee joint from being injured. METHODS An economical embedded system with a designed acceleration-weighted curve fitting method was developed to estimate and predict the knee fatigue state. Then the warning message and recommended lasting time were sent to users to avoid excessive exercise. 24 healthy volunteers were involved in the experiments to verify the effectiveness of the system compared to human perception. RESULTS Only using human perception to prevent knee joint fatigue had a risk of failure while the designed wearable system could protect knee successfully. It was also found that the knee of female was more likely to be injured than the one of male in intense exercises and a high BMI value could influence the risk of knee injuries during sports. However, a short break in sports could significantly extend the healthy time for knee. CONCLUSIONS Early warning from the specially designed embedded system can successfully help people avoid knee joint fatigue and injuries during exercises, such as running, badminton, table tennis and basketball.

Sign in / Sign up

Export Citation Format

Share Document