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Differences in head accelerations between blunt impacts performed on a linear impactor and monorail were compared across impact locations and velocities. Difference scores varied by impact location, but seem to be highly specific and non-generalizable across locations and velocities.
The initiation and propagation of cranial fracture following blunt impact remain poorly understood. To evaluate the significance of intrinsic skull properties on remote fracture initiation, computational models of representative specimens were tested under a variety of extrinsic impact conditions an...
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.
This study was designed to understand the influence of a spine self-mobilization exercise program on postural stability in the antero-posterior (AP) and medio-lateral (ML) directions. The center of pressure (CoP) was quantified while young healthy adults were standing with eyes open and closed. Resu...
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...
Individuals with spinal cord injuries (SCI) who use manual wheelchairs (MWCs) are more susceptible to shoulder pathology than able-bodied individuals. A gap in knowledge exists in understanding how shoulder function of MWC users during daily living compares with the able-bodied population. To start ...
The purpose was to compare muscle and hip contact forces (HCF) during gait in FAI patients pre- and post-surgery. Hip kinematics and kinetics were computed and muscle and HCF were estimated using musculoskeletal modelling. FAI patients showed significant improvement scores in reported outcomes, redu...
Cervical spine kinematics obtained from four in vitro loading conditions were compared to in vivo kinematics with respect to the instantaneous center of rotation (ICR).
A real-time dynamic MR sequence (acquisition time=10.5sec) was used to evaluate the in vivo finger biomechanical parameters during motion on ten healthy volunteers. Joint angle and moment arm of flexor digitorum profundus tendon were measured on the acquired images during motion at metacarpo-phalang...
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...
Femoroacetabular impingement (FAI) syndrome has been related to joint and muscle adaptations. Three different FAI patient age groups had their range of motion (ROM), strength and functionality compared. Although hip ROM and functionality were similar between groups, muscle strength was smaller for e...
In order to ascertain the significance of spine stability in holding the upright-standing posture after focal muscular disuse atrophy, two optimization-driven approaches were employed to develop kinematics-driven (KD), and stability-based kinematics-driven (SKD) musculoskeletal (MS) models of an adu...
Hip fracture is a common health risk among elderly people worldwide. Sideways or lateral fall has been identified as the most critical situation for the elderly to develop a hip fracture, since the hip is normally covered with a thin layer of soft-tissue that is inadequate to attenuate the impact fo...
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 ...
Mini tightrope suspensionplasty is a surgery performed to reduce pain and improve function in individuals with arthritis of the thumb joint. The goal of this work was to determine and develop a 3D visualization that demonstrated changes due to this surgery. Post-surgery, thumb forces increased by 66...
Aged or knee osteoarthritis gait is commonly assessed via optical motion capture (MoCap). However, tracking changes or identifying deficits in gait in the real-world setting is difficult to accomplish with MoCap. In this study, we tested the ability of inertial measurement units (IMUs) to capture ga...
The sarcomere force-length (FL) relationship can be derived theoretically using thick and thin filament lengths. Here, we determined the mean sarcomere FL curve using directly- measured sarcomere lengths (SL) and muscle forces in an intact muscle and compared it to the theoretical FL curve. Tibialis...
We present initial performance metrics of a robotic system for in vitro simulation of 3D physiologic human shoulder motion. Scapular and humeral positions and orientations in the cadaver were driven by 3D human shoulder motions acquired using a biplane fluoroscopy system. An industrial robot base al...
The force velocity relation (f-v-r) of the human gastrocnemius medialis was assessed using maximum voluntary preactivation prior to shortening at different angular velocities. Compared to previous work, preloading resulted in increased torque outputs and clearly decreased slope characteristics of th...
Bones’ structure and strength are highly regulated in response to local bone strains, caused by muscle and inertial loading during movement. In order to examine the osteogenic stimulus provided by different habitual activities and exercises we measured human tibia deformation in vivo using motion ...
The use of walking boots (WB) is one of the most common treatments for diverse foot and ankle injuries such as sprains of Grade II or higher, pressure ulcers, and/or plantar fascia release. WBs have been shown to be beneficial for injury recovery, however, it is important to alert users of the subse...
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...
The one-step self-calibrating bundle adjustment (BA) is a calibration approach for high-speed biplanar videoradiography (HSBV). This study demonstrates that the BA, in comparison to a modified direct linear transformation (DLT) calibration, results in kinematic differences and reduced bias. This is ...
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...
In München treffen sich drei Studenten. Sie kennen sich von der Universität. Der Deutsche Matthias erzählt von seinem Urlaub in Norddeutschland. "Ich fuhr mit dem Bus zum Bahnhof und stieg in einen Zug, der an die Nordsee fuhr. Meine Eltern leben auf einer Insel, die man nur mit ...
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...
The in vivo elongation patterns of the medial (MCL) and lateral (LCL) collateral ligaments following total knee arthroplasty (TKA) were investigated during level walking and squatting using moving video fluoroscopy and subject-specific modelling. Furthermore, a Monte Carlo analysis revealed the in v...
The force length relation (f-l-r) of the gastrocnemius medialis (GM) was assessed at extreme dorsiflexed positions using ultrasound, motion capture, electromyography (EMG) and dynamometry. Thereby, the beginning of the descending limb of the f-l-r was experimentally shown, allowing the determination...
Recent experimental studies of human walking have shown that within an individual step the pelvis (CoM) state can be used to predict the next foot placement. Here, we used a simple open-loop-stable 2D walking model to show that one cannot take this predictive ability, by itself, as evidence of activ...
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