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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...
Our purpose was to examine the effects of combined pelvic corrective force and non-paretic leg resistance force on paretic leg muscle activity during treadmill walking in individuals with stroke. Nine subjects with stroke participated. A corrective force to the pelvis toward the paretic leg and a re...
One-handed lifts, frequently used for lifting of light objects or activities of daily living (ADL), are understudied in the biomechanics literature. Twenty healthy participants (30-70 years old) matched in age and sex to 18 participants with low back pain (LBP) were recruited to compare a one-handed...
Running is a bilateral activity, but the majority of running injuries are unilateral. Differences in load experienced by the left and right sides of the body may help explain this paradox. This study examined the prevalence of left/right asymmetry among 30 recreationally active adults running at 1.8...
Adults with obesity are at greater risk for knee osteoarthritis (KOA). Greater quadriceps function, but not knee flexion during gait, was associated with a larger medial to lateral femoral cartilage thickness ratio and a lower femoral cartilage echo-intensity. Adverse femoral cartilage outcomes that...
As a part of “Non-operative treatment of Achilles tendon Rupture in Central Finland: a prospective cohort study – NoARC” results from the first 12 patients who completed biomechanical assessments 1 year after active, structured, and functional non-surgical treatment of acute Achilles tendon (A...
Automated plantar pressure (PP) masking can improve reporting time, remove human error/bias, and standardize masking methods when used for PP-based gait analysis. Twenty participants walked while optical motion capture cameras tracked 3-dimensional locations of the markers and a PP mat simultaneousl...
Pelvic fracture is a disruption of the bony structures of the pelvis. Pelvic fracture fixations are needed to restore the original position. The present study investigated the strengths and limitations of different treatment strategies for vertically unstable pelvic fractures using a three-dimension...
The Dresden technique preserves the paratenon during Achilles tendon (AT) repair and may improve the plantarflexor mechanism when combined with mobilization during early rehabilitation. However, the surgical repair design for AT ruptures can affect rates of re-rupture or lengthening. Therefore, we d...
The rate of force production (1/tc; tc is ground contact time) and volume of active muscle (Vm) account for 62% of the metabolic cost of running over a wide range of step frequencies. Additionally, 1/tc and Vm account for 48% of the metabolic cost of hopping at the same range of frequencies. Thus, 1...
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...
It is recommended that a thorough assessment of the athlete’s performance through this battery of clinical tests be performed to identify deficiencies prior to competitive sports participation. Using such a performance evaluation tool will aide in objectifying the clinical decision-making used to ...
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...
We present methodology to integrate motion capture with a plantar/shear stress measurement device. The combined system can be used to characterize foot plantar tissue deformation and calculate multi-segment foot joint kinetics.
The relationships between general fall risk and standing measures during ladder use were assessed both with and without a concurrent cognitive task. Individuals with higher fall risk scores had increased time to complete the ladder task and reduced dual-task performance. Other ladder standing parame...
Reactive balance training (RBT) using trip-like perturbations on a treadmill was implemented for four weeks among independent older adult residents of retirement communities. Training-induced improvements in trunk kinematics could be predicted from only trunk kinematics following trip-like perturbat...
Low back pain is a disabling pathology to which several workers are exposed. Our study aimed at finding biomechanics driven biomarkers of incorrect lifting postures. For this reason two cohort of subjects were analysed (healthy and affected by low back pain) through plantar pressure, electromyograph...
Shoulder joint is subjected to a very demanding role for athletes as well as workers lifting weights above their shoulders. Type II SLAP (Superior Labral Anterior to Posterior) lesion is the most common type of SLAP. CT scan images were obtained from a patient's shoulder diagnosed with type II SLAP ...
Few studies to date have examined the scaling of gait parameters with respect to body mass in humans of varying body sizes. This study examined how vertical and leg stiffness scale in 40 healthy adults. We calculated scaling exponents for vertical and leg stiffness from kinematic and kinetic data us...
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 objective of this study was to measure the sensitivity of outside assessments compared to in-lab measures in older adults with history of falls. Participants performed indoor and outdoor walking trials. Motion capture and accelerometers were used to measure gait. Only Lyapunov Exponent (LyE) of ...
This study characterizes plantar pressure differences between hallux valgus patients and healthy controls using statistical parametric mapping (SPM). The plantar pressure differences are minimal which, combined with previous studies, suggest high variability in the plantar pressures of hallux valgus...
Second anterior cruciate ligament (ACL) injuries occur in about 29% of patients following return to sport. Asymmetric movement patterns are associated with second ACL injury risk during landing. A negative psychological response during recovery has been associated with decreased gait symmetry. This ...
The ability to use reactive stabilization strategies to recover from a slip or a trip is vital for preventing falls. Physiological impairments after stroke, such as weakness and delayed sensorimotor processing may reduce the effectiveness of rapid stepping responses to restore balance following unex...
There exists no clear guidance for the biomechanical accommodation period to a prosthetic device for persons with lower limb loss. As such, studies have utilized accommodation periods ranging from 5 minutes to >1 year before commencing data collection [1], potentially limiting reliability and validi...
Dynamic materials handling tasks greatly contribute to low back pain cases in the U.S. To biomechanically differentiate between techniques, a musculoskeletal model in OpenSim and EMG-assisted muscle dynamics estimator, the CEINMS software, were used to quantify risk factors for two waste collection ...
The Olympic Games are a multi-sport global event with several modalities. Currently, thousands of athletes participate in the Olympic competitions, improving teamwork, organization and union in pursuit of a goal. "Biomechanics", a discipline present in the curriculum of Physiotherapy and Physical Ed...
This study investigates the mechanical effect of load-bearing through a prosthetic socket on the residuum of a transfemoral amputee using a combined musculoskeletal and finite element modelling approach. We use finite element results to estimate the risk of bone resorption in the amputated femur whe...
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