Muscle function deterioration in female patients with severe knee osteoarthritis (KOA) is linked to alterations muscle morphology, composition, and mechanical properties. This study evaluates thigh features KOA explores correlations joint function. Ultrasound shear wave elastography measured physiological cross-sectional area (PCSA), echo intensity (EI), modulus (G) the rectus femoris (RF), vastus lateralis (VL), medialis (VM), biceps long head (BFL), semitendinosus (ST) of 24 controls. EI...

Large and repeated impacts on the heel during running are among primary reasons behind runners’ injuries. Reducing plantar pressure can be conducive to reducing injury improving performance is primarily achieved by modifying design parameters of shoes. This study examines effect shoes (i.e., heel-cup, insole material, midsole thickness) landing peak determines combination different that optimize cushion effects employing Taguchi method. We developed foot–shoe finite element (FE) model...

Objective To evaluate the effects of surgery and rehabilitation on patients undergoing total knee arthroplasty ( TKA ). Methods Twelve 12 healthy controls were enrolled their clinical scores evaluated by a doctor. Gait data, including walking velocity, stride length, single support time, foot fall swing power, collected using portable gait analyzer from before 6 weeks months after controls. The data at selected time points compared correlations between characteristics assessed. Results...

Knee valgus and varus morbidity is at the second top place in children lower limb deformity diseases. It may cause abnormal stress distribution. The magnitude location of contact forces on tibia plateau during gait cycle have been indicated as markers for risk osteoarthritis. So far, few studies reported force distribution tibial knee children.To estimate stresses an 8-year old obese boy with a 7-year healthy boy, three-dimensional (3D) finite element (FE) models their left joints were...

Objective The third generation Intelligent Device for Energy Expenditure and Activity (IDEEA3, MiniSun, CA) has been developed clinical gait evaluation, this study was designed to evaluate the accuracy reliability of IDEEA3 measurement lumbar spinal stenosis (LSS) patients. Methods Twelve healthy volunteers were recruited compare cycle, cadence, step length, velocity, number steps between a motion analysis system high‐speed video camera. Twenty hospitalized LSS patients comparison five...

To assess the tibio-femoral contact forces before and after total knee arthroplasty (TKA) in patients with osteoarthritis (KOA) by three-dimensional (3D) finite element analysis (FEA) models gait analysis.Two hospitalized Kellgren-Lawrence grade IV varus KOA two healthy subjects were enrolled this study. Both underwent unilateral TKA. FEA established based on CT MR images of knees subjects. Gait was performed using a motion capture system force plate. Three direction at ankle joints...

Abstract Background Different posterior tibial slopes (PTS) after posterior-stabilized total knee arthroplasty (PS-TKA) may lead to different biomechanical characteristics of joint. This cadaveric study was designed investigate the tibiofemoral kinematics and contact pressures PS-TKA with PTS. Methods Nine human specimens were used for PTS 3°, 6°, 9°. The measured during flexion angle changing from 0 120° (with an increment 10°) axial load 1000 N at each angle. Results root mean square (RMS)...

Objective To establish a logistic regression model using surface electromyography (SEMG) parameters for diagnosing the compressed nerve root at L 5 or S 1 level in patients with lumbar disc herniation (LDH). Methods This study recruited 24 compression and 23 caused by LDH from May 2014 to 2016. SEMG signals bilateral tibialis anterior lateral gastrocnemius were measured. The mean square (RMS), RMS peak time, power frequency (MPF), median (MF) analyzed. accuracy, sensitivity, specificity...

AbstractThe four-fibre family constitutive relation has been used to capture the mechanical behaviour of arterial walls under biaxial loading conditions. This study shows that material parameters model can be determined by uniaxial extension data from walls. Stochastic optimisation methods were determine based on strip samples with circumferential and axial orientations thoracic aortas pulmonary arteries two fresh donation bodies. Moreover, we implemented numerical experiments, in which...

Soft tissues are anisotropic materials yet a majority of mechanical property tests have been uniaxial, which often failed to recapitulate the tensile response in other directions. This paper aims study feasibility determining material parameters by uniaxial extension with minimal loss information. We assumed that preselecting certain constitutive model, we could give based on data from orthogonal strip samples. In our study, Holzapfel–Weizsäcker type strain energy density function (H–W...

The meniscus is an indispensable structure for the normal functioning of knee joints. Meniscal tears may cause intense clinical symptoms and predispose to premature joint degeneration. Knowledge its mechanical characteristics serve as experimental basis future studies on artificial synthesis meniscus, treatment injury finite element modeling joint. However, few have concentrated biomechanical properties human meniscus. authors performed uniaxial tensile experiments samples from 20 menisci...

Different posterior inclinations of tibial component after unicompartmental knee arthroplasty (UKA) may lead to different biomechanical characteristics the joint. This finite element study was designed investigate tibiofemoral contact pressures UKA with component.Finite model a healthy joint constructed, and mobile-bearing (MB) models 5 (3°, 5°, 7°, 9° 11°) components were simulated. The maximum plateau cartilage in lateral compartment polyethylene insert medial calculated based on ground...

Gait phases are important to evaluate the walking function and identify characteristics of pathological gaits. However, it is difficult differentiate gait outside laboratories, thus, this study aimed develop a method detect 8 sub-phases using wearable multiple sensor system artificial neural network (ANN). Motion sensors were used acquire acceleration lower limbs, force sensitive resistors contact state between foot ground. Walking was recorded high-speed camera. Two feed forward...

Cerebral palsy (CP) is the most prevalent physical disability originating in childhood and with impaired motor function secondary to injury of immature brain. In this paper, we developed a robotic ankle-foot rehabilitation system for children cerebral (RARS-CP). We introduce novelties robot mechanical design, actuation transmission, hierarchical control system. Customized graphical user interfaces are Labview environment based on FPGA-based embedded To validate reliability feasibility...

Thigh muscles greatly influence knee joint loading, and abnormal loading significantly contributes to the progression of osteoarthritis (KOA). Muscle weakness in KOA patients is common, but specific contribution each thigh muscle unclear. The gait data from 10 severe female controls were collected, maximum isometric forces biceps femoris long head (BFL), semitendinosus (ST), rectus (RF), vastus lateralis (VL), medialis (VM) calibrated via ultrasound. Four musculoskeletal (MSK) models...

Overweight and obesity in childhood can cause some orthopedic problems these may deteriorate as the age increases. Gait changes reflect problems. Currently there are very few studies on gait characteristics of overweight obese (OWO) children with different age. The purpose this study was to investigate OWO parameters were measured by a footscan plantar pressure system. SPSS11.0 used for statistical analysis. Significance defined α<;0.05. Results showed that 9-10-year-old had shorter heel...