Michele J. Grimm

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2.36 cm diameter cores of trabecular bone (n = 22), oriented in the mediolateral direction, were obtained from fresh-frozen calcanei of 16 cadavers ranging in age from 32 to 89 yr. The cores were defatted and tested to determine values for permeability along the cylinder axis. Permeability values (0.4-11 x 10(-9)m2) were found to be strongly correlated with(More)
Computer modeling is becoming increasingly important in the realm of brain biomechanics and injury. New computer simulations range from modeling of brain surgery, a low frequency, high strain event, to predicting injury as a result of an impact to the head, a high frequency event with varying strain magnitudes. This range of modeling efforts requires(More)
STUDY DESIGN A finite element parametric study was performed to investigate the structural roles of the vertebral cortical shell and the trabecular centrum. OBJECTIVES To address the debated issue of the relative load-carrying role of the vertebral cortical shell. SUMMARY OF BACKGROUND DATA Several experimental and computational studies have been aimed(More)
OBJECTIVES Several new retrograde supracondylar intramedullary nails have been developed to specifically address fractures of the distal femur. The nails appear clinically effective, but there are few biomechanical data documenting the stability of the fixation or the mechanical stiffness of the different designs. The goal of this study was to assess the(More)
Cementless acetabular components require good initial fixation to allow bony in-growth. The initial press-fit stability, important for designs that do not rely on supplemental fixation, was examined for three designs with different porous coating systems: beads, fiber mesh, and plasma spray. The ability to withstand tangential loads was determined (maximum(More)
This paper discusses two novel applications of nuclear magnetic resonance (NMR) as an investigational tool for the assessment of cancellous bone microarchitecture. It further outlines extensions of the method forin vivo clinical evaluation of bone strength in patients with skeletal disorders such as osteoporosis. The first method relies on the hypothesis(More)
OBJECTIVE The purpose was to study the impact of maternal endogenous and clinician-applied exogenous delivery forces on brachial plexus stretching during a shoulder dystocia event. STUDY DESIGN A computer software crash dummy model (MADYMO, version 5.4, TNO Automotive, Delft, The Netherlands) was modified on the basis of established maternal pelvis and(More)
OBJECTIVE A computer model was modified to study the impact of maternal endogenous and clinician-applied exogenous delivery loads on the contact force between the anterior fetal shoulder and the maternal symphysis pubis. STUDY DESIGN Varying endogenous and exogenous loads were applied, and the contact force was determined. Experiments also examined the(More)
Surgical glove integrity is essential for universal precautions; glove safety is verified by the water load test (WLT). Concerns regarding glove injury have prompted newer testing methodologies, including electrical conductance testing (ECT); however, the sensitivities of these tests are not known. We compared the sensitivity of WLT and ECT in detecting(More)
OBJECTIVE The objective of the study was to determine how standard shoulder dystocia maneuvers affect delivery force and brachial plexus stretch. STUDY DESIGN A 3-dimensional computer model of shoulder dystocia was developed, including both a fetus and a maternal pelvis. Application of suprapubic pressure, rotation of the infant's shoulders, and delivery(More)