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The performance of the computers “central processing units” (CPUs), “graphics processing units” (GPUs) and of the “inertial measurement unit” (IMUs) is constantly evolving. In this paper, we apply IMUs data to an avatar in a game “integrated development environment” (IDE) to stimulat...
University of Colorado Colorado Springs students have developed a low-cost video tracking software system for use in biomechanical applications. The objective was to provide an alternative to expensive cameras and force plates to the general community for calculating ground reactions forces (GRF), j...
Sit-to-stand (STS) is an important activity of daily living. Individuals with Prader-Willi Syndrome (PWS) have larger internal ankle moments and larger proportion of ankle moment distribution compared to individuals with and without obesity. Improving STS characteristics may contribute to greater mo...
Head impact monitors can track athlete impacts and estimate their spatial and temporal aspects. And to monitor athletes in real-time, a monitoring system must report data accurately and precisely, and avoid reporting too many spurious, false events. For decades this has proven very labor intensive a...
We show that, following adaptation to split-belt walking, margin of stability of the slow and fast legs separately converge to their respective speed-matched margin of stability values in normal treadmill walking. The predicable steady-state margin of stability values in split-belt treadmill walking...
The intrinsic link between slower and faster muscle contractile elements in the musculoskeletal system can be generalised across scales from motor units within a muscle to synergistic muscles. At both scales, a unified plan should govern recruitment during movement across a range of mechanical deman...
In a full-factorial experiment, the effect of height, porosity and pore size at three levels on the structural stiffness of 3D-printed, polylactic acid (PLA) scaffolds was investigated. The porosity and structural properties of the scaffolds were measured. The principal finding was that all three fa...
This study seeks to validate a method for measuring three-dimensional knee rotations with inertial measurement units (IMUs) on human subjects and with measurements from optical motion capture (MOCAP). Unlike a prior validation conducted with an instrumented mechanical linkage, experiments on human s...
The goal of this research is to evaluate the effects of the Mobility Enhancing Device for Sit-To-Stand (MEDSTS); a sit-to-stand assist exoskeleton that is under development as part of this research investigation. The MEDSTS mimics the human system through the use of artificial tendons, on human loco...
This study investigated the relationship between joint angle variability and mean joint stiffness in two stroke patients who suffered different degree of impairment to lower extremity motor function.
The medial structures of the knee such as the superficial medial collateral ligament (sMCL), deep medial collateral ligament (dMCL) and posteromedial capsule (PMC) are the most frequently injured tissues and a lot of research has been conducted. However, the length change patterns of these tissues h...
Osteoarthritis (OA) associated chronic pain leads to reduced function and engagement in activities of daily living. This study investigated the efficacy of low-level laser therapy (LLLT) on cartilage integrity. Monoiodoacetate (MIA) model of OA was used to evaluate cartilage degradation following tw...
Prediction of uneven terrain through motor intent pattern recognition has potential for real-time lower-limb prosthesis control to improve amputee balance. Subject-specific pattern recognition algorithms based on residual limb muscular and inertial sensors predicted an uneven step with greater than ...
MRI allows non-invasive, quantitative assessment of ACL healing in vivo. Previously, a linear model employing MRI T2* relaxometry has been shown to predict structural properties of the ACL post ACL-repair (ACLR). This study shows that a machine learning model using common MRI features can achieve st...
Disuse induced by botulinum toxin indicates that tendon remodeling during growth is different from that in skeletally mature animals.
Varying recruitment patterns between slow and fast motor units can be correctly predicted using musculoskeletal simulations that minimize a cost function that is metabolically-informed. The use and function of different types of motor unit allows contractions to be metabolically economic and mechani...
A control optimization model predicts that an oscillating force perturbation can substantially influence the energetic cost of walking. Cost is decreased when peak ground reaction forces are aligned with positive perturbation forces (in-phase) but increased with the opposite alignment (anti-phase). ...
Fretting corrosion has emerged as one important reason for failure of modular hip prostheses during the last decade. This increase might be associated with the reduction of the taper diameter to improve the range of motion of the hip joint, which occurred about 20 years ago. The magnitude of the mic...
Climbing is a sport requiring strength, flexibility, and coordination. Because children with cerebral palsy have deficits in each of those areas, climbing was proposed and evaluated as a recreational therapy. Participants completed a uniform set of lateral and vertical steps (8 to 16 in). Limb force...
The present study analyses how climate change aspects affect morphological and biomechanical features of bivalve shells, specifically the Chilean oyster Argopecten purpuratus. Specimens were raised in a controlled environment and exposed to different pH and temperature conditions. Morphological and ...
Limb symmetry indices during single-limb hop tasks and counter-movement jumps are often used as screening tools for evaluating knee joint function in injured populations, although no evidence exists to support their use in a paediatric population. We sought to determine whether clinically significan...
Principal component analysis (PCA) was used to analyze the waveforms of lower-extremity joint moments of 186 healthy adolescents and young adults during over-ground walking gait. Post-puberty gait was characterized by greater hip extension moment in late stance, greater hip external rotation moment ...
Timing of peak muscle activity of the biceps femoris long head during stance phase of running was compared for people with a transtibial amputation using running-specific and daily-use prostheses. The amputated leg had earlier peak activity compared to the intact leg using both prostheses, suggestin...
To address the lack of sensation that accompanies limb loss, an increasing number of amputees are receiving a nerve transfer surgery, Targeted Reinnervation (TR). Touches at the surgery site can feel as though they originate in the amputated (phantom) limb. However, sensory recovery after this surge...
Pubic symphysis width is measured using 3D freehand ultrasound in different birthing positions: supine, lithotomy position, standing and squatting. The relative position of the pubic bones would also be analysed. Preliminary results show that the motion at pubic symphysis in different positions incl...
Deformability of the foot and thicknesses of lower extremity muscles were measured and kinetic/kinematic analyses of normal shod walking were done on children and adults. Children showed higher relative navicular drop and smaller peroneus longus muscle thickness, and characteristic features in the g...
Mechanical loading has been shown to positively influence tendon healing; however, the mechanisms remain unclear. This study aimed to evaluate the ability of biophysical stimuli - principal and deviatoric strain - in regulating healing using finite element (FE) method. Axisymmetric FE models were cr...
Due to the high frequency of parastomal herniation (PSH) in colostomy patients, as well as general disagreement regarding its prevention, the application of lumbosacral orthoses (hernia belts) is explored as a non-invasive PSH prevention method of late. Five hernia belt materials were tested axially...
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...
Surgical resection of pelvic sarcomas requires the determination of one or more cutting planes by the surgeon. The biomechanical consequences of choosing the location and angle of the cutting plane are not well known and may require attention to patient-specific conditions. This study investigated t...
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