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Spinal fusion surgery combined with interbody fusion cage is an important treatment for lumbar disc herniation, lumbar degenerative joint disease combined with radiculopathy, spondylolisthesis combined radiculopathy, and spinal instability. This study focused on investigating whether pedicle screw t...
Articular cartilage (AC) is a fibre-reinforced connective tissue that covers the ends of articulating bones, providing joint lubrication, and thus allowing for smooth movement. Since AC is avascular, nutrients and proteins primarily transport via molecular diffusion. Thus, AC behavior has been exten...
While several types of kinematics have been used to assess unstable sitting control, their contribution to the completion of this task is unknown. The overall goal of this study was to understand the kinematics used to stabilize the trunk in unstable sitting as elicited via a wobble board (WB). The ...
Knee flexion and extension muscular force plays an important role in athletic performance as well as joint stability. Generally, women exhibit weaker peak force than men even after the force is normalized to their body weight. However, it is inconclusive whether there are sex differences in force st...
Two ambulatory individuals with incomplete spinal cord injury (iSCI) received two months of gait training performed in a movement amplification environment. Specifically, during treadmill walking a cable robot applied a continuous lateral force to the pelvis proportional in magnitude and in the same...
The purpose of this study was to determine if associations existed among hip adduction angle, hip abductor muscle activity, and hip abductor strength in runners. A larger peak hip adduction angle was associated with more tensor fascia lata activity magnitude during running. Stronger hip abductors we...
We used a markerless Deep Learning-based method to perform 2D kinematic analysis of deepwater running. Twenty-one volunteers performed deepwater running while a GoPro camera recorded sagittal plane lower limb motion. A deep neural network was trained to predict the locations of lower limb landmarks....
Studies have shown that risk of noncontact injury largely depends on knee abduction (KA) at the time of injury, with Anterior Cruciate Ligament (ACL) injuries occurring at significantly larger KA than the KA at initial contact with the ground [2]. The goal of this study was to assess whether the Max...
Mechanomyography (MMG), a low frequency sound signal, can be used to record muscle internal mechanical movements. In this study, we use MMG to measure muscle vibrations of human medial gastrocnemius (MG) during isometric plantarflexion at different contraction forces and at different ankle joint pos...
Existing literature has established kinematic and kinetic differences between treadmill and overground running. This study sought to investigate how metatarsophalangeal joint (MTPJ) mechanics differ between the two conditions. Range of motion, peak moment, and joint stiffness of the MTPJ were signif...
A time-series-based classification method (kNN) was used to quantify kinematic changes of a shoe’s roll-over process between two repeated runs in different shoe comfort conditions. Data was collected using a gyroscope attached to the shoe. A significant difference between the achieved classificati...
Novice runners are more prone to knee injury than experienced runners. Knee injuries are related to frontal and transverse plane running kinematics. However, the kinematic differences between experienced runners and new runners have not been completely described. We compared frontal and transverse p...
Internal knee abduction moments affect mediolateral distribution of tibiofemoral loads and, thus, are likely related to the development of knee osteoarthritis (OA). Four normal weight (NW), overweight (OW), and obese (OB) participants performed gait (G), cycling (C), and elliptical (E) training expe...
Dysfunctional postural control is one of the key problems in children with cerebral palsy (CP) which interfere with the activities of daily life [1] and have been suggested to be a major component of gait disorders in CP [2]. However, little is known about the mechanisms underlying impairments in po...
Cadaveric motion tracking data was collected to establish¶ canine cranio-cervical junction (CCJ) kinematics and the role¶ of supporting ligaments. Preliminary analysis suggests that¶ dorsal atlantoaxial (DAL) and alar ligaments (AL) are the¶ main restrictors in atlantoaxial flexion and lateral b...
The purpose of this study was to develop and validate soft and rigid tissue mass prediction equations for the thigh, leg, and leg-foot segments of living older adults. Comprehensive anthropometric measurements were used to develop the prediction equations using multiple linear regression. Actual low...
This Study compared leg, ankle, and knee stiffness during running between a maximal and traditional shoe before and after a 6-week acclimation period to maximal shoes. Leg stiffness was significantly higher in the maximal shoes, while ankle stiffness was significantly higher in the traditional shoe.
This study aimed to develop a model to predict ice hockey shot puck trajectory based on the initial puck launch vectors and aerodynamic variables. Using motion capture data collected from wrist and slap shots executed within an ice arena, a puck’s position and orientation was tracked from release ...
Osteoarthritis (OA) development after anterior cruciate ligament reconstruction (ACLR) is a well-documented phenomenon. Loading alterations early after surgery have been linked to the development of OA. Early OA is characterized by the loss of glycosaminoglycans (GAG) within cartilage. This study ex...
Using continuous relative phase (CRP) methodology, we quantified shank-foot couplings in time periods surrounding initial ground contact in runners wearing two shoe conditions with extreme differences in midsole cushioning levels. Non-linear mixed effects modeling was used to examine for differences...
Different tests are used to assess postural control. This study evaluates dependence between Center of Mass (COM) movements (in four directions: forward, backward, left and right ) during voluntary postural sways and results of Limits of Stability (LOS). Healthy women over 50 years old, who exercise...
There is a paucity of research regarding the relationship between fast pitch softball pitching mechanics and pain. Thus, understanding the pitching mechanics of those pitching with and without upper extremity (UE) pain is needed. Inability to efficiently use the kinetic chain to throw a rise ball pi...
The present study investigated whether performing 10 knee flexor maximal voluntary isometric contractions (MVICs) would attenuate muscle damage induced by maximal eccentric contractions of the same leg. Twenty-four young men performed 100 knee extensor eccentric contractions using the right leg, and...
Knee shape is intimately linked to the kinematics of the knee joint. Deep flexion is important for both cultural and recreational activities. However, the relationship between knee shape and kinematics in deep flexion are not well understood. The aim of this study was to examine the association betw...
Real world walking environments are constantly changing in both predictable and unpredictable ways. Our previous research suggests that people form a predictive model of their environment that is used to control whole body walking trajectories in response to novel yet consistent environment changes....
Surface EMGs were recorded from two muscles of the dominant lower leg during vibratory stimulation at different frequencies, while participants kept two postures on a vibrating platform. Ten vibratory sessions, combining various frequencies and postures were administered in a randomised order. RMS v...
Sprinting plays an important role in many different Olympic sports, including field hockey. Better insights in how sprint performance is determined and evolves during the season is important to improve training protocols. The aim of this study was to investigate changes in the sprint performance of ...
Annulus fibrosus (AF) cells of intervertebral discs (IVD) were cultured for 72h inside a 3D type I collagen matrix. When collagen matrix constructs were embedded with live AF cells, substantial matrix contraction (up to a 60% reduction in size) was observed. This contraction was not observed in cons...
Yunshou is a primary movement form of all kinds of Tai Chi, to which the meniscal stress response characteristic is not clear. This study applied finite element (FE) analysis with kinetic data to track the meniscal stress response during the typical Yunshou. The knee could flex with max angle of 58Â...
The mechanisms governing the attraction of biological molecules remain an open question in biophysics and chemistry, particularly in the case of actin and myosin. These molecules have characteristic lengths on the order of 10 nm, suggesting that they are subject to thermal agitation, Hamaker, and el...
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