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University of Washington
Applied Biomechanics Laboratory
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Research Interests
Our current research interests primarily involve the examination of the adult and pediatric spine from both clinical and injury biomechanics perspectives. These research projects have led to improved clinical treatment and age-related biomechanical response data for the child cervical spine. We've also investigated the biomechanics of the hip and the foot and ankle with projects seeking to optimize the surgical placement of hip implants and evaluate the design of total ankle joint replacement systems. These efforts, both experimental and computational, are briefly described in the following five sections:
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Our adult spine research efforts have been largely focused on characterizing the mechanics of the spinal column in response to various external loads at both quasi-static and dynamic loading rates. In addition to obtaining the more traditional load-displacement metrics, we have developed novel transducers to monitor the integrity of the spaces (foramen) available to the neurologic tissues for documenting the potential for neurologic injury both during and after spinal column injury events. Motivating this research is need for injury tolerance criteria which assimilates both the structural and neuroprotective roles of the spine. Various modes (directions) of loading, as well as a broad spectrum of loading rates which typify the dynamic rates at which spinal injuries occur, are being investigated using our custom high-speed MTS test frame and bench-top acceleration sled.
Understanding the effect of component design and placement on the range of motion for total hip replacement (THR) was pursued using three-dimensional computer models. Three-dimensional anatomic models were generated using CT scans and imported into a CAD modeling environment to assess joint range of motion based on object interference. From a design perspective, femoral component head/neck ratio and liner edge shape were examined for their effect of range of motion. In addition, the surgical placement (positioning) of both the acetabular and femoral components were studied for their effect on range of motion.
Biomechanically, the foot is the primary load-bearing interface between the human body and the environment during locomotion and stance. Working in close collaboration with the Puget Sound VA Center for Limb Loss Prevention and Prosthetic Engineering [link], our laboratory has been actively studying the biomechanics of the foot and ankle complex to characterize its mechanical (material and structural) properties and investigate the normal, pathologic, and reconstructed response to physiologic loading. Both experimental (cadaver) and computational (finite element) models have been developed to facilitate our research aims. Our current focus is on the continued development of a finite element (FE) model of the human foot. As part of this focus, we have been characterizing the non-linear viscoelastic properties of the ligaments of the foot and ankle to provide accurate material models of our finite element model.
We have also begun to evaluate the clinical outcomes and biomechanical effectiveness of total ankle replacement systems being surgically implanted at the University of Washington. An ultrasound vibrometry technique has been developed to assess the status of osteointegration of the talar component of the implant. |