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We present Feasibility Theory, a conceptual and computational framework to unify today’s theories of neuromuscular control. We begin by describing how the musculoskeletal anatomy of the limb, the need to control individual tendons, and the physics of a motor task uniquely specify the family of all...
Today's midsole materials combine increased compliance with high resilience and reduce the metabolic cost of running substantially. By how much can these reported metabolic savings improve distance running performance?
Animal musculoskeletal models have great potential to inform human biomechanical modelling methodology. Here, fully subject-specific human lower limb models were created using similar methods to those previously used to generate a mouse hindlimb musculoskeletal model. The merits of both models and t...
Conventional exoskeleton designs for improving human ‘gas-mileage’ rely on motors to transfer net energy from machine to user with the intention of reducing net muscle work and thus, heat loss. In contrast, our design philosophy is that unpowered or minimally powered exoskeletons offer a streaml...
Hand and wrist anatomy and biomechanics are among the most complex in the musculoskeletal system. Optimal function requires exacting interplay between several uniquely shaped and interdependent bones, articular surfaces, intrinsic and extrinsic ligaments and myotendinous units. Conditions that affec...
Low back pain (LBP) is often researched from isolated points of view, but real advancements in understanding require multidisciplinary perspectives. Biomechanics is an essential element of this, but requires careful integration with other disciplines. Here I highlight the utility of this approach an...
High peak axial tibial acceleration has been associated with tibial stress fracture in gait laboratory studies. Mobile monitoring indicates tibial acceleration increases when running outdoors compared to in the laboratory. Thus, careful interpretation of field-based values is needed with replication...
Mechanical power generated via triceps surae muscle-tendon interaction is an important determinant of walking performance. This interaction is made complex by the architecture of the Achilles tendon (AT), with distinct bundles of tendon fascicles, known as "subtendons", arising from the biarticular ...
The potential for use of magneto-inertial sensors into an in-field sport setting is highlighted by providing a general overview of the spreading in their use through different sports disciplines and applications. Information is given on risk profile assessment (e.g. studying injury mechanisms to hig...
Using standardised kinematic inputs and implant alignments can limit the scope of experimental wear testing for total joint replacement. Introducing patient and population inputs, from biomechanical, clinical and retrieval studies, can enhance the predictive power of pre-clinical testing for evaluat...
Biomechanical changes in gait as a result of pregnancy have been studied in walking but not running. Thus, the objective of this pilot study was to examine changes in running mechanics, particularly at the pelvis and trunk, between pre- and post-pregnancy as well as changes in running habits. At 6-w...
Performance footwear is a system of design attributes tuned to deliver an athlete benefit. With strategically constructed samples, attributes can be investigated for their influence on biomechanical, energetic, physiological, and/or perceptual factors. In this talk, I will take you through our footw...
Biomechanical changes as a result of minimal running have been studied in different aspects but not gender. Thus, the objective of this pilot study was to examine: a) gender interest and participation in this training approach; b) gender responses to a 12-week barefoot running training. Female runne...
Dr. Finley’s research focuses on the neuromechanics and control of healthy and pathological gait. He was the first to demonstrate that learned behaviours observed during adaptation to walking on a split belt treadmill are likely driven by a preference for economical gaits. Here he will present rec...
Muscles exhibit history-dependence where forces in response to stretch are higher if muscle is isometric prior to stretch. This short-range stiffness is critical for generating the initial stabilizing torques reactive balance after perturbations, before sensorimotor muscle responses occur. Moreover,...
Osteoarthritis (OA) is prevalent, debilitating and costly condition that affects many joints in humans. OA onset can occur post joint trauma, e.g. anterior cruciate ligament rupture and reconstruction (ACLR), or from joint abnormality, e.g. femoroacetabular impingement (FAI). Once OA is established ...
Osteoarthritis (OA) is characterized by the painful degeneration of diarthrodial joints and is the leading contributor to disability worldwide. OA disproportionately affects individuals with obesity. Traditionally, the relationship between OA and obesity has been explained by increased loading due t...
National arthroplasty registries around the world have an increasingly important role in monitoring population-based quality outcomes in total hip and knee arthroplasty since the first registry was started in 1979. The registries combined with design, material and surgical improvements have led to s...
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...
Transcranial Magnetic Stimulation (TMS) is a safe non-invasive technique employed to investigate motor cortical or corticospinal functions. Magnetic stimulation can also be used for peripheral nerve (PMS) in order to assess muscle function. This presentation will briefly review the interest of using...
This study aimed to compare dynamic foot pressure distributions at different phases of walking in three different foot postures: a normal one (pes planus) and two abnormal ones (pes rectus and pes cavus). Fifteen young subjects participated in this study. At the start of mid-stance, the peak pressur...
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 ...
While steady-state gait is relatively well-understood, transient manoeuvres have received far less dedicated research. These motions are difficult to study because they can be dangerous when executed at high speed. Additionally, differing points of initiation, animal morphologies and environments cr...
The hand and wrist represent one of the most challenging structures in the study of biomechanics, as well as in the evaluation of many biomechanical principles. Hand and wrist biomechanics has been somewhat underdeveloped in comparison to mainstream biomechanics research over the past century. While...
Dr. Selinger’s research combines a big data approach with controlled lab experiments, and computational models of learning to study motor learning and optimization in human locomotion. Here she will discuss her recent work focused on how the nervous system discovers and learns energetically optima...
Recent developments in medical imaging allow for the non-invasive assessment of intervertebral disc properties (biochemical and biomechanical) and spinal arthrokinematics through the use of quantitative magnetic resonance imaging (MRI) and biplane radiography, respectively. This talk will highlight ...
Evaluation of TKA by means of robotic cadaver studies and associated numerical analyses allows quantifying the effect of component size selection on the resulting laxities of the knee throughout its arc of flexion (envelope of motion). Relatively small changes of 2mm in tibial insert height and/or f...
Predictive testing that will result in wear rates and patterns that closely reflect true in vivo use will advance the design process of knee prostheses. Any preclinical elimination of material and/or design errors directly improves implant longevity and impacts ultimately the well-being of the patie...
Muscle-based simulations have predicted the metabolic cost of locomotion with varying success. We investigated if independent recruitment of motor units within a muscle could reduce the predicted cost. We predicted metabolic cost using experimental data of walking and simulations that consisted of i...
Hip dysplasia is an anatomic deformity that causes joint instability and abnormal contact mechanics, which is known to lead to hip pain and early osteoarthritic joint degeneration. Computational modeling using techniques such as discrete element analysis (DEA) offers the opportunity to evaluate intr...
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