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This pilot study investigated the impacts of a whole-body, powered exoskeleton on low-back muscle activation and joint ranges-of-motion (ROM) in a load carriage task performed by able-bodied individuals. The prototype exoskeleton (Guardian XOTM, Sarcos Robotics) had 16 active degrees of freedom. Aft...
This study investigated effects of game-play on elite under 20-year-old basketball players’ hamstring and adductor muscle forces during an anticipated cut task. These muscle forces decreased post-game in 40-80% of participants, which has been previously linked to destabilization of the knee and in...
Knee joint kinematics and strain for the Anterior Medial (AMB) and Posterior Lateral (PLB) bundle of the Anterior Cruciate Ligament (ACL) were calculated using a modified OpenSim model for a group of Division 1 Collegiate female athletes during a land and cut task. Group comparisons were made betwee...
Plantarflexor functional deficits are associated with poor outcomes in patients following Achilles tendon rupture. In this study, we established the link between changes in gastrocnemius structure with plantarflexor function 3 months after injury. We found that deficits in peak isokinetic torque wer...
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...
This study assessed the effects of an intrinsic foot muscle (IFM) strengthening program on biomechanical factors associated with the development of plantar fasciitis. Following an 8-week, periodized IFM strengthening protocol, rearfoot and midfoot eversion, medial longitudinal arch deformation, and ...
Ankle exoskeleton (exo) optimization typically focusses on steady-state (SS) walking conditions, even though non-steady-state (nSS) walking comprises a large portion of daily locomotion. An improved understanding of how exos impact nSS and SS gait differently may further inform optimal exo design. W...
The effects of typical mountain ultramarathon races (100 miles, i.e. 170 km) on neuromuscular fatigue have been well described. This study aimed to compare neuromuscular fatigue and recovery between two 170 km races i) in one single stage, and ii) when splitting the course in four equal stages of 42...
The association between asymmetries in quadriceps strength and ground reaction forces (GRF) during gait was evaluated in 11 individuals with acute anterior cruciate ligament reconstruction (ACL-R). Results indicate quadriceps weakness is associated with reduced GRF acutely following surgery. Restora...
The study proposed a model-based tracking procedure integrating an asynchronous biplane imaging system, motion compensated frame interpolation and two different image registration strategies, namely forward-projection and backward-projection methods, for measuring 3-D dynamic joint motion. Successfu...
We examined effects of two murine models of altered loading on postnatal muscle development in the glenohumeral joint. Forearm amputation via elbow disarticulation resulted in decreased muscle mass and optimal length, consistent with previous altered hindlimb loading models.
Studies showed that a constant forward traction force applied at the waist can reduce metabolic cost. However, there is limited information about the effects of non-constant forces. Our aim was to investigate the effects of timing and magnitude of different forward force profiles on metabolic cost. ...
Aging is on the verge of a new era. Humans are approaching old age in unprecedented numbers. Increases in the prevalence of age-related diseases, frailty, and disability are visible signs of this historic demographic shift affecting the incidence and prevalence of osteoporotic fractures. Therefore, ...
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 ...
An induced power analysis was implemented on the throwing motion of the trunk, upper arm, and forearm during baseball pitching to decompose the energetic contributions to elbow valgus loading. Trunk flexion and rotation torques generated energy in arm-cocking and contributed more than half the energ...
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...
We investigated changes in joint mechanics and metabolic rate due to walking with the trunk inclined at different angles. Participants walked with trunk angles from -15 to +60 deg. Metabolic rate increased with both forward and backward trunk angle, confirming that people habitually walk near the me...
Swing tempo and rhythm are the most important golf performance indicators. In this study, we investigated the swing tempo and rhythm according to different golf clubs and distance using a wireless inertial measurement unit (IMU) sensor. 14 golfers performed repeated, consistent swing with three golf...
High knee flexion postures, despite their association with increased joint loading, are frequently adopted in occupational childcare. This study sought to quantify the frequency and depth of high knee flexion postures adopted by childcare workers in order to evaluate their increased risk of knee ost...
Tackling is repetitively performed in rugby game play, critical to team performance, yet poor execution increase injury risk. Players are taught from a young age to engage in 1-on-1 lower or upper body tackles, yet limited research on whether coaching instruction can alter three-dimensional (3D) tac...
Longitudinal assessment of gait stability in populations with a higher risk of falling may enable novel fall prevention efforts. This study investigated the reliability of characterizing walking under different cognitive loads using gait stability measures. Within- and between-day reliability of sho...
A computer simulation for pedaling movements was conducted. The computer model had the muscles on the lower extremities including the bi-articular muscles, and a neural oscillator controlled the activity of the muscles resulted in joint movements periodically. As a result, the bi-articular muscles c...
New interventions for spinal pathologies can be tested on computational models of the spine without putting the patient at risk. However, existing models are usually built from different datasets which may be inconsistent with each other. In this study, a full body musculoskeletal model was develope...
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...
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...
After total joint replacement, patients aim to resume typical activities of daily living but also to perform sportive and athletic activities. However, there is only little knowledge about the in vivo joint loads acting during such activities. Furthermore the group of patients receiving an artificia...
The current study describes the results of anterior-posterior (A-P) impacts conducted on the restrained mandibles of 25 male cadaveric specimens. Specimens were impacted using a gravity-driven drop tower with a cylindrical impactor. Results were used to generate an injury criterion based on impact f...
We present a statistical shape model (SSM) for predicting cartilage morphology from bone, which may enable the rapid generation of cartilage morphology from sparse imaging data. A SSM was trained on 25 segmented MRIs of the knee. The bones of the SSM were fitted to raw segmented data from one test s...
Reverse total shoulder arthroplasty (RSA) surgery is an effective treatment strategy for patients with varying shoulder deficiencies. The purpose of this study was to quantify the distribution of bone density in the scapulae of patients undergoing reverse shoulder arthroplasty (RSA) to guide optimal...
The aim of this study is to validate trunk, pelvis, hip, knee and ankle kinematics assessed by an inertial sensor system in healthy controls (HC) and persons with knee osteoarthritis (KOA) during a functional movement protocol. Therefore, kinematics were compared against an optoelectronic system. Th...
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