Grant C. Roush

Wright State University

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Bruce J. Sangeorzan

University of Washington

William R. Ledoux

University of Washington

Eric C. Whittaker

VA Puget Sound Health Care System

Nathaniel R. Bridges

Wright-Patterson Air Force Base

Patrick Sadoghi

Medical University of Graz

Stephen E. Mosher

Darrin J. Trask

Mayo Clinic Hospital

Tarun Goswami

Wright State University

Nicholas J. Vaudreuil

Cedars-Sinai Kerlan-Jobe Institute

Andreas Leithner

Medical University of Graz

Cooperative Institutions

University of Washington

VA Puget Sound Health Care System

Wright-Patterson Air Force Base

United States Air Force Research Laboratory

University of Puget Sound

Rehabilitation Research and Development Service

Medical University of Graz

University of Graz

Wright State University

Harborview Medical Center

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Cadaveric Simulation of Flatfoot and Surgical Corrective Techniques: The Evans versus the Z-osteotomy

Grant C. Roush

Cadaveric spasm

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Citations (2)

Effects of Variable Helmet Weight on Human Response to -Gx Impact

John R. Buhrman Grant C. Roush Erica M. Johnson Chris Perry Nathaniel R. Bridges

Abstract : Helmet-mounted systems (HMS) may increase the potential for aircrew neck injury during aircraft ejection due to the increase in dynamic loads generated in the cervical spine as a result of the change in helmet inertial properties. A series of tests were conducted on a horizontal impulse accelerator with human subjects wearing forward-weighted helmets to investigate the effects of helmet inertial properties and bracing on human response to short-duration frontal (-Gx) impacts, as might be experienced during the seat deceleration and parachute opening shock phases of ejection. The tests demonstrated that some subjects began experiencing discomfort and pain when wearing 3.5 lb helmets at 10 G seat accelerations. While overall neck loads demonstrated little or no gender difference, the female subjects were on average unable to sustain as forceful a brace during pre-impact as the males, which may account for their higher head accelerations and higher percentage of reported adverse effects. Pilot bracing techniques may therefore have a beneficial effect on injury risk by off-loading some of the neck loads experienced during ejection.

Aircrew

Neck injury

Bracing

10.21236/ada631990

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Citations (1)

Failure modes for total ankle arthroplasty: a statistical analysis of the Norwegian Arthroplasty Register

Archives of Orthopaedic and Trauma Surgery (2014)

Patrick Sadoghi Grant C. Roush Norbert Kastner Andreas Leithner Christof Sommitsch

Norwegian

Implant Failure

10.1007/s00402-014-2067-8

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Citations (21)

Comparison of transfer sites for flexor digitorum longus in a cadaveric adult acquired flatfoot model

Journal of Orthopaedic Research® (2013)

Nicholas J. Vaudreuil William R. Ledoux Grant C. Roush Eric C. Whittaker Bruce J. Sangeorzan

ABSTRACT Posterior tibialis tendon (PTT) dysfunction (PTTD) is associated with adult acquired flatfoot deformity. PTTD is commonly treated with a flexor digitorum longus (FDL) tendon transfer (FDLTT) to the navicular (NAV), medial cuneiform (CUN), or distal residuum of the degraded PTT (rPTT). We assessed the kinetic and kinematic outcomes of these three attachment sites using cadaveric gait simulation. Three transfer locations (NAV, CUN, rPTT) were tested on seven prepared flatfoot models using a robotic gait simulator (RGS). The FDLTT procedures were simulated by pulling on the PTT with biomechanically realistic FDL forces (rPTT) or by pulling on the transected FDL tendon after fixation to the navicular or medial cuneiform (NAV and CUN, respectively). Plantar pressure and foot bone motion were quantified. Peak plantar pressure significantly decreased from the flatfoot condition at the first metatarsal (NAV) and hallux (CUN). No difference was found in the medial–lateral center of pressure. Kinematic findings showed minimal differences between flatfoot and FDLTT specimens. The three locations demonstrated only minimal differences from the flatfoot condition, with the NAV and CUN procedures resulting in decreased medial pressures. Functionally, all three surgical procedures performed similarly. Published 2013 by Wiley Periodicals, Inc. on behalf of the Orthopaedic Research Society. J Orthop Res 32:102–109, 2014.

Cadaveric spasm

Flexor Digitorum Longus

Tendon transfer

Navicular bone

10.1002/jor.22488

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Citations (15)

Finding Cadaveric Human Head Masses and Center of Gravity: A Comparison of Direct Measurement to 3D ing

Grant C. Roush

Cadaveric spasm

Center of gravity

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Citations (2)

Second metatarsal osteotomies for metatarsalgia: A robotic cadaveric study of the effect of osteotomy plane and metatarsal shortening on plantar pressure

Journal of Orthopaedic Research® (2013)

Darrin J. Trask William R. Ledoux Eric C. Whittaker Grant C. Roush Bruce J. Sangeorzan

Symptom relief of recalcitrant metatarsalgia can be achieved through surgical shortening of the affected metatarsal, thus decreasing plantar pressure. Theoretically an oblique metatarsal osteotomy can be oriented distal to proximal (DP) or proximal to distal (PD). We characterized the relationship between the amount of second metatarsal shortening, osteotomy plane, and plantar pressure. We hypothesized that the PD osteotomy is more effective in reducing metatarsal peak pressure and pressure time integral. We performed eight DP and eight PD second metatarsal osteotomies on eight pairs of cadaveric feet. A custom designed robotic gait simulator (RGS) generated dynamic in vitro simulations of gait. Second metatarsals were incrementally shortened, with three trials for each length. We calculated regression lines for peak pressure and pressure time integral vs. metatarsal shortening. Shortening the second metatarsal using either osteotomy significantly affected the metatarsal peak pressure and pressure time integral (first and third metatarsal increased, p < 0.01 and <0.05; second metatarsal decreased, p < 0.01). Changes in peak pressure (p = 0.0019) and pressure time integral (p = 0.0046) were more sensitive to second metatarsal shortening with the PD osteotomy than the DP osteotomy. The PD osteotomy plane reduces plantar pressure more effectively than the DP osteotomy plane.

Metatarsalgia

Cadaveric spasm

Metatarsal bones

First metatarsal

Plantar pressure

10.1002/jor.22524

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Citations (11)