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Trochlear dysplasia (TD) and medial patellofemoral ligament (MPFL) rupture are major factors in patellofemoral instability. We studied the effect of TD and MPFL rupture on PF contact pressure and kinematics in a cadaver-specific musculoskeletal knee model during a simulated non-weight-bearing knee e...
This study examined the changes in the smoothness of joint torques during therapeutic interventions to sit-to-stand (STS) movement performed by the subjects after stroke. The results showed two expert physiotherapists consistently handled the motions to adjust the smoothness. The effect was observed...
A comparative computational probabilistic analysis assessed influences of evolutionarily important musculoskeletal features on rotator cuff function for human and chimpanzee glenohumeral joints. Species-specific distinctions emphasized differences in primary shoulder function and provide novel conte...
Rearfoot (RF) and non-rearfoot strike walking (NRFSW) data from a homogenous population were collected to analyze distal foot joints kinematics. With a multi-segment foot model, kinematic differences were found at the ankle and midtarsal (MT) joint during the two walking conditions. The results may ...
This study aimed to investigate the ankle joint power during stair ascent in different foot initial contact strategies and to find a better strategy. Twenty healthy young men performed stair ascent with two different initial contact methods, i.e., rear-foot strike and forefoot strike. Forefoot strik...
Asymmetric loading of unilateral bone-anchored limb prostheses in walking animals has been attributed to low power production at the passive ankle prosthesis due to high stiffness of the prosthetic foot. We compared power developed by a bone-anchored prosthesis with stiff and compliant feet during w...
Insertional Achilles tendinopathy (IAT) is a common condition in recreational athletes that causes heel pain. The recurring pain may trigger load compensation mechanisms and concomitantly lead to strength and gait asymmetries. 15 patients with unilateral IAT performed maximal isometric ankle plantar...
The purpose of this study was to investigate the effects of altered talus alignments on ankle joint contact forces (AJF) during vertical hopping. Motion capture and ground reaction force data were collected as ten participants hopped at 2.4 Hz. Various cases of anterior translation and medial rotati...
Material slippage forms a major issue in the biomechanical testing of soft tissues. We here present a clamping technique utilizing 3D printing technology which allows to test soft tissues in a highly standardized and high throughput manner. Results from image correlation and scanning electron micros...
Gait asymmetry is detrimental as it alters knee stability. To better understand how gait asymmetry affects knee stability fifteen healthy individuals performed an asymmetric walking protocol. Autoregressive (AR) modelling was employed to quantitatively and graphically delineate differences in peak s...
Arthrogenic muscle inhibition (AMI) is a known phenomenon that causes reflex inhibition of muscles that surround the injured joint. The mechanisms of AMI remain unclear. Novel decomposed electromyography (dEMG) technology may reveal motor unit (MU) firing frequency and recruitment of AMI. EMG was co...
The strength characteristics of the knee and ankle muscles of high-level athletes have positive significance for better design of exercise training programs and prevention of sports injuries. Taking the Chinese men's volleyball players as the research object, it is found that the balance of the maxi...
This study aimed to examine whether fixing the ankle in dorsiflexion vs in plantarflexion affects knee flexion torque and hamstrings activity during ramp isometric contractions. Ten pairs of fine wires were inserted into the four heads of the hamstrings and 15-channel high-density electromyography (...
Understanding differences in locomotor biomechanics between walking and running provides fundamental information about human ambulation. Recently, studies of ankle mechanical impedance during locomotion have provided new insight into disturbance response, stability, and energy transfer. Despite stud...
Ankle sprains are one of the most common musculoskeletal injuries, leading to chronic ankle instability (CAI) in 30-40% of first-time sprains. Clinicians assess passive stability under non-weight-bearing conditions, but their relevance to weight-bearing conditions when ankle sprains occur is unclear...
Unilateral transtibial amputees have an altered walking gait including asymmetry between the intact limb and the prosthetic limb. Here we show that ankle taping on non-amputees induces left-right asymmetries in anterior/posterior ground reaction forces during walking similar to those seen in individ...
Comminuted, intra-articular distal tibia/fibula fractures remain a surgical challenge. It has been suggested that plates be applied on the compression side of the fracture; hence, medial plates for varus fracture patterns. No prior biomechanical investigations have examined this in a model that incl...
An automated approach to predict personalized progression of knee osteoarthritis (OA) was developed and compared against 8-year follow-up data of 104 subjects. The developed approach was based on the subject information, subject-specific anatomical dimensions from MRI and finite element (FE) simulat...
Cam-type femoroacetabular impingement (FAI) is linked with participation in specific elite-level sports. We measured hip motion during adolescent elite-level sport practices with wireless magneto-inertial sensors. Athletic-elite adolescents had increased motion intensity and hip flexion during pract...
The patellofemoral dysfunction (PFD) is commonly related to changes in dynamic stabilization of the knee, mainly during activities as descending stairs, where there is higher stress to the joint. The aim of this study was to angles during the step-down test in the healthy knee and the knee with PFD ...
A new variable stiffness torsion adapter for a lower limb prosthesis was developed to reduce soft tissue shear stress in the residual limb by reducing transverse plane stiffness during activities of daily living. However, direct measures of shear stress are challenging due to the inability to optica...
An analytic theory is developed that determines the conditions for sagittal plane rotation (referred to as a “pitchover”) of a mountain bike and rider. The model assumes a rigid geometry of the bike and rider, but energy loss is approximated using a variable coefficient of restitution. Two confi...
When computing ankle joint complex power using inverse dynamics, should you cut holes in the shoes to allow for skin-mounted motion tracking markers? And how important is consistency in marker location on the foot? We addressed these two important questions in walking and running. Our results sugges...
When walking at similar speeds, greater positive hip extensor and/or flexor work is thought to compensate for lower positive ankle work during push-off in older versus young adults. Ankle moments contribute to positive ankle work in walking and are reduced in old age. We used induced acceleration an...
Ankle impedance plays a critical role in how we interact with our environment. Understanding the mechanisms underlying these interactions is especially important when joint function is impaired. Ankle impedance is proportional to ankle torque and muscle activation during postural control tasks; howe...
Using a novel rheological model of anterior cruciate ligament (ACL) loading, we estimated ACL force (FACL) in females during drop-land-cut and running manoeuvres, as well as the loading mechanism. In both tasks, peak loading occurred shortly following initial foot contact, but was larger during drop...
We investigated the effect of a continuous upward force applied to the arm on shoulder neuromuscular activity and kinematics in healthy young adults. With assistance compared to without, muscle activity was lower in muscles contributing to shoulder elevation and unchanged in other muscles. The shoul...
This aim of this study is to use an infrared-assisted trunk accelerometer-based gait analysis system to real-time investigate and compare gait quality of chronic stroke patient with healthy participants in the teaching hospital. Compared with heathy participants, walking speed, cadence, step length,...
Due to the long term consequences of ACL rupture, including pain, instability, loss of function, and early onset osteoarthritis, injury prevention is of the utmost importance. The efficacy of prevention programs may be enhanced by data quantifying the positions that put the ACL at risk for injury. U...
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