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In vivo strain measurements in the human buttock during sitting using MR-based digital volume correlation.
J Biomech
January 2024
College of Science and Engineering, Flinders University of South Australia, Adelaide, Australia.
Advancements in systems for prevention and management of pressure ulcers require a more detailed understanding of the complex response of soft tissues to compressive loads. This study aimed at quantifying the progressive deformation of the buttock based on 3D measurements of soft tissue displacements from MR scans of 10 healthy subjects in a semi-recumbent position. Measurements were obtained using digital volume correlation (DVC) and released as a public dataset.
View Article and Find Full Text PDFLeg Length Discrepancy After Hip Fracture Repair is Associated With Reduced Gait Speed.
Geriatr Orthop Surg Rehabil
June 2023
Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
Introduction: A negative correlation exists between functional outcomes and leg length discrepancy (LLD) following hip fracture repair. We have assessed the effects of LLD following hip fracture repair in elderly patients on 3-meter walking time, standing time, activities of daily living (ADL), and instrumental activities of daily living (IADL).
Methods: One hundred sixty-nine patients enrolled in the STRIDE trial were identified with femoral neck, intertrochanteric, and subtrochanteric fractures that were treated with partial hip replacement, total hip replacement, cannulated screws, or intramedullary nail.
PIPER adult comfort: an open-source full body human body model for seating comfort assessment and its validation under static loading conditions.
Front Bioeng Biotechnol
May 2023
Université de Lyon, Université Claude Bernard Lyon 1, Université Gustave Eiffel, LBMC UMR_T 9406, Lyon, France.
In this paper we introduce an adult-sized FE full-body HBM for seating comfort assessments and present its validation in different static seating conditions in terms of pressure distribution and contact forces. We morphed the PIPER Child model into a male adult-sized model with the help of different target sources including his body surface scans, and spinal and pelvic bone surfaces and an open sourced full body skeleton. We also introduced soft tissue sliding under the ischial tuberosities (ITs).
View Article and Find Full Text PDFA Case Study on the Effects of Foam and Seat Pan Inclination on the Deformation of Seated Buttocks Using MRI.
IISE Trans Occup Ergon Hum Factors
January 2022
Univ-Lyon, Université Claude Bernard Lyon1, Université Gustave Eiffel, LBMC UMR_T9406, F69622, Lyon, France.
OCCUPATIONAL APPLICATIONSWe investigated the effects of seat pan inclination and foam on the deformation of the seated buttocks using an upright MRI system. From observations among four healthy males, we found that soft tissue deformation under the ischial tuberosity (IT) could be reduced not only by using a soft cushion, but also by decreasing the shear force on the seat pan surface. These results suggest that soft tissue deformation could be used as an objective measure for assessing seating discomfort and injury risk, by accounting for the effects of both contact pressure and shear.
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