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In orthopaedic surgeries, evaluation and treatment planning are highly based on empirical evidence and clinical expertise of each surgeon. Furthermore, inter-subject anatomical variation is hardly considered in decision-making. Therefore, the aim of this study was to create a clinically applicable p...
The foot medial-longitudinal arch (MLA) is perhaps the most important feature characterizing foot morphology. Current MLA models based on skin-markers for motion analysis allow non-invasive assessment of foot arch shape and deformation, but little is known on their anatomical accuracy and repeatabil...
Eccentric exercise training, whereby muscles generate significant tension whilst lengthening, evoke broad ranging adaptations in the musculotendinous system that differ from training where predominately isometric or concentric actions are performed. This provides the opportunity for prioritising ecc...
Individuals with lower extremity bone tumors (osteosarcoma or Ewing’s sarcoma) have complex reconstructive procedures which may result in changes to muscle architecture. This preliminary work demonstrates the use of static and extended field-of-view ultrasound to measure architecture of the vastus...
Markerless motion capture technology has the potential to revolutionize the way biomechanics researchers collect data. By moving data collection out of the lab, new research opportunities previously unavailable will be opened to the greater biomechanics community. Our work utilizing a combination of...
This study quantified how rigid foot plates of different length altered individual foot segment kinematics during walking. The foot plates impacted most segment ranges of motion. The greatest changes were seen for toe and forefoot dorsiflexion.
It is important to understand the kinematics of deep knee flexion due to the difficulty patient have performing this activity. bfPCA can describe variability across the entire movement cycle and also identify patterns which a-priori feature identification cannot. The aim of this study was to use to ...
Uneven terrain causes fluctuations in walking speed. Some fluctuations follow the physical height change of each step, but humans might also actively adjust their speed in anticipation of upcoming terrain [1]. Simultaneity makes these two effects difficult to separate, but speed fluctuations over a ...
To better understand human locomotion, it is necessary to assess the mechanical behaviour of individual muscles in vivo and relate it to joint function. For this purpose, we developed a novel intra-operative method that measures hamstring muscle forces with respect to knee angles in vivo. We applied...
Mechanical loading of the spine has shown to be an important risk factor for the development of low-back pain. A passive flexible beam exoskeleton was tested during static bending tasks and during lifting. The EXO reduced back muscle activity by 20-40% (i.e. 2-4% MVC) during static bending and aroun...
This study investigated EMG activation of the neuromuscular partitions of supraspinatus and infraspinatus during external rotation and abduction tasks against elastic resistance. Twenty-two participants completed dynamic arm movements using Theraband™ elastics while EMG activity from two partition...
The purpose of this study was to investigate the associations between range of motion (ROM) and stiffness of muscle, fascia and nerve in young and elderly individuals. Ankle dorsiflexion ROM was determined based on onset of pain using a dynamometer. Tissue stiffness was evaluated by ultrasound shear...
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 is a pilot study to investigate if a new conceptual diagnostic test, the Stand-Up Test (SUT) can assess subtle mobility decline in independent community dwellers. A 3D motion capture analysis was applied to quantify the center of mass momentum (COM) during sit-to-stand tasks. The COM controls i...
The aim of this study was to explore the effects of rear-foot strike running with cushioning running shoes on the muscles strength of longitudinal arch. We recruited 9 rear-foot strike runners (wearing the cushioning shoes during running) and 9 non-running people to test the metatarsophalangeal join...
Mechanical fatigue is the predominant etiology of stress fracture but the mechanism governing the fatigue failure of bone is poorly understood. Recent work from our lab suggests that intracortical microarchitecture is strongly associated with the fatigue life of bone. Vascular canals induce stress c...
Individuals with bipolar disorder (BPD) exhibit gait abnormalities during symptomatic phases, but whether gait patterns are affected during asymptomatic phase is not known. Accordingly, this study aimed to describe gait patterns in asymptomatic individuals with BPD (n=14) as compared to healthy cont...
This study determined the impact of different ankle braces on both sexes’ knee biomechanics during a single-leg cut. With the lace-up brace, both sexes altered knee biomechanics that may impact knee injury risk during the cut. All participants decreased peak knee internal rotation angle, while fem...
We aim to develop a more reliable paradigm in which to measure cortical voluntary activation (cVA) in nonimpaired and patient populations. Modulation of joint angle and paired pulse transcranial magnetic stimulation (ppTMS) were examined as means of improving the measurement of cVA due to their abil...
Healthcare lacks effective tools to identify patients in danger of post-traumatic osteoarthritis progression. Knee joint inflammation and excessive shear strains due to mechanical loading post-injury have been suggested to promote the disease progression. We developed a mechanobiological algorithm t...
We compared joint kinetics among three footwear types in inexperienced and experienced runners. Minimal footwear increased plantarflexor involvement while highly cushioned footwear increased knee extensor involvement. Experienced runners ran with greater plantarflexor involvement than inexperienced ...
Natural adult aging is associated with a reduction in muscle force production capacity during isometric and shortening contractions. However, during active lengthening of muscle, force is well-maintained into old age. In this symposium I will discuss the age-related maintenance of eccentric strength...
The onset and progression of knee osteoarthritis (OA) has been associated with the mechanical environment of the articular cartilage during walking. Knee hyperextension (KH), an underrepresented condition typically define as more than 5° of extension, produces increased contact stress on the articu...
Animals easily navigate complex terrain and can rapidly and safely reject unexpected perturbations. However, the underlying mechanism at the muscle-tendon level of this behaviour is unclear. To study this, we attach a real muscle-tendon unit to a novel bio-robotic interface that emulates interaction...
Clinically, short foot exercise (SFE) is provided to raise the medial longitudinal arch. However, there is no evidence whether this intervention could change the stiffness of medial plantar soft tissue during SFE. The findings in this study demonstrated that Novel Foot Plantar Dynamometer (NFPD), wh...
The aim of this study was to investigate force loss in isometric contractions and during active stretch, following muscle damage, and thus gain insight into the role of the active and passive force components on muscle damage and active stretch contractions. Skinned muscle fibres were repeatedly (4 ...
The aim of this study is to determine which functional exercises (n=9) shows the largest difference in calculated hip and knee contact force (CF) between hip/knee OA patient groups and the healthy controls (HC). The exercises consisted of level walking, ascending and descending stairs, forward lunge...
The importance of working technique to prevent low back injuries remains unknown. Simulating a manual material handling task, we found that individual factors and working technique explain 64% and 48% of the variance in cumulative moments at L5/S1 joint.
Recently, we suggested that cross-bridge kinetics and residual force enhancement (RFE) contribute to the stretch-shortening cycle (SSC) effect. Cross-bridge kinetics and RFE are affected by fiber type. Therefore, we examined the influence of fiber type on the SSC effect and RFE. Rabbit psoas and sol...
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