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The aim of this study was to identify the kinematic factors during a fastball pitch that are associated with ball velocity (BV) and peak elbow varus moments (PVar) in collegiate baseball pitchers. Fifteen collegiate baseball pitchers underwent 3D motion analysis testing. Correlation and multivariate...
Downhill walking is an inevitable part of daily living and causes higher knee joint loading compared to level walking in young healthy populations. The purpose of this study was to compare knee biomechanics of the replaced limb to the non-replaced limb of TKR patients and healthy controls during wal...
Plenty of patients with anterior cruciate ligament reconstruction (ACLR) had a second injury of the anterior cruciate ligament (ACL), due sensorimotor deficits that remain after the discharge of the patient. The purpose of this study was to determine the differences in knee kinematic and postural sw...
Non-motorized ‘passive’ exoskeleton designs can reduce the metabolic cost of walking by reducing triceps surae activity. We evaluated the consequences of submaximal voluntary activation on the plantar flexion torque-ankle angle relationship. Our preliminary results indicate that this relationshi...
Our loading experiment in patients with medial compartment knee osteoarthritis before and after high tibial osteotomy revealed that not only COMP but also MMP-3, MMP-9, C2C, CPII, PRG-4 and IL-6 are sensitive to a walking exercise and that the pre-to postoperative change in knee adduction moment is ...
This study reports a preliminary longitudinal analysis of shoulder muscles EMG onsets in patients surgically treated for rotator-cuff tear. Fourteen patients were recruited. Anterior Deltoid, Upper and Lower Trapezius onsets were collected during humerus elevation. Three sessions were completed for ...
Obesity leads to a plethora of health risks and in addition, the excess adipose tissue in obese individuals negatively affects skeletal muscle by altering biomechanics and muscle activation patterns. This study was an exploratory study used to determine if muscle activity and lower extremity joint k...
Landing is considered a high-risk movement. Understanding lower extremity muscle contributions to three-dimensional ground reaction forces (GRF) may give insight to redesigning safe landing techniques. Five females completed an unanticipated stop-jump task. Musculoskeletal modelling was used to esti...
3D gait analysis provides insight into the lower limb biomechanics of knee osteoarthritis. We hypothesized that stressing the locomotor system through walking on an incline would amplify biomechanical differences in gait between participants with osteoarthritis and asymptomatic controls. Nineteen pa...
Activities of daily living (ADL) often involve forward bending. Some of these tasks can be performed using a one-handed braced arm-to-thigh technique (BATT) to support the trunk on the thigh. Three common ADL (i.e. weeding, reaching for objects in low cupboards, and car egress) were simulated in the...
In hip osteoarthritis, pain may limit kinematic variability during gait and thereby concentrate repetitive loads on the hip joint. This exploratory study examined hip kinematic variability according to pain and structural disease severity. We found no evidence to suggest that kinematic variability, ...
Individuals following ACL-Reconstruction (ACLR) often present with signs of persistent muscle weakness. In this study, measures of quadriceps strength and fatigue were compared between individuals following ACLR and healthy active controls. ACLR knees presented with patterns of fatigue resistance co...
The purpose of this study is to investigate differences in frontal plane knee mechanics during drop jump between those with low – (LQ) and high Q-angle (HQ). HQ showed not only increased knee abduction (ABD) angle but reduced knee adduction (ADD) moment through the middle of landing cycle.
Age-related decline of the physiological functioning of the sensorimotor system negatively affects balance control. According to the hypothesis of reduced complexity with ageing and disease, lower functional complexity of the control system would induce center-of-pressure motion (CoP) of balance tha...
Accurately predicting the locomotion state of a person’s next step is critical for control of multifunctional prosthetic devices. The output from the Beta Process Auto Regressive Hidden Markov Model (BP-AR-HMM) provides consistent and concise state output when classifying patterns throughout a gai...
There are no longitudinal studies investigating the joint kinematics of the lower limbs following tibial plateau fracture. This means that physiotherapists and surgeons do not have the quantitative data on changes in function with time, which may be vital for postoperative rehabilitation. This study...
Energy absorption in the lower extremity during a 90 unilateral cut was assessed in collegiate female soccer players pre and postseason using a 6 degree-of-freedom (DOF) power analysis. Intervention team completed the [FIFA] 11+ during the season, control team players did not. Players in both gro...
Pressure-based auditory feedback training (PBFT) from a clinically-appropriate wireless shoe insole was employed to facilitate the skill acquisition for subjects with medial knee osteoarthritis (OA). The goal of the PBFT was for subjects to learn a gait modification that targets knee load distributi...
Lower extremity joints illustrate torsional spring-like behaviour during running. While the influence of running speed and different strike patterns on joint quasi-stiffness have been investigated, the changes associated with graded running are not known. Ankle and knee joint stiffness of twelve rea...
The objective of this research was to determine the in vivo measurement precision (reproducibility) of magnetic resonance (MR) based finite element (FE) modeling outcomes. MR images (1.5T) of the left proximal femur of 13 participants were used to construct FE models. Precision errors of the FE outc...
Knee abduction moment (KAM) during drop vertical jump (DVJ) and hip abductor strength predict ACL injury prospectively. The purpose of this study was to determine relationships between these risk factors during a dynamic landing task. Kinematics and kinetics, including muscle forces, during DVJ were...
Major knee ligament injuries, such as ACL injury, cause long-term neuromuscular dysfunctions and morphological changes. Individuals after ACL reconstruction surgery (ACLR) exhibit quadriceps weakness and decreased force steadiness even months after surgery. The current investigation aimed to examine...
The abrupt lateral translation of the knee during walking, often referred to as varus thrust, has been used as a proxy of medial knee loading in patients with knee osteoarthritis. While attempts have been made to quantify varus thrust using high-speed motion capture or accelerometers, there is littl...
Acute knee injuries are the most prominent of all severe sporting injuries, whereby neuromuscular deficits and aberrant knee mechanics during landing are well documented as contributing factors [1,2,3]. Participants with greater proprioceptive acuity were found to land with decreased knee flexion at...
We quantified jumping biomechanics and ultrasound imaging in collegiate basketball players to explore injury screening tools in jumping athletes. Our current results support use of shear wave ultrasound in conjunction with 3D jumping biomechanics compared to convention ultrasound, MRI, and survey sc...
Rollators are frequently prescribed for older persons suffering from gait and balance disorders in order to improve mobility and quality of life. Rollators are designed to decrease the risk of falls by improving gait mechanics of their users. However, data on the biomechanics of rollator assisted ga...
Persons with transtibial amputation often exhibit problematic trunk motion during walking, yet optimal clinical interventions have yet to be established. This study applied an induced acceleration simulation analysis to identify differences in the whole-body strategy persons with versus without TTA ...
Principal Component Analysis (PCA) is a technique for feature extraction which identify strong patterns in a dataset and emphasize data variation. PCA can be used to characterise bone shape variations in tibia, fibula and femur on a paediatric population. PCA was performed on 64 femurs and 67 tibia/...
A musculoskeletal model that incorporates backpack attachments at the torso and pelvis was developed to evaluate load carriage effects during walking in military service members wearing backpacks with/without a hip-belt. Compressive L4-L5 and axial hip joint contact forces were not significantly dif...
The removal of gender restriction in combat-centric roles will increase female soldier exposure to regular heavy load carriage. Physiological sex differences place women at a disadvantage for these physically demanding roles. Identifying sex-specific responses during a standardised load carriage tas...
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