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| http://dx.doi.org/10.15288/jsad.24-00107 | DOI Listing |
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The Restoration of the Prearthritic Joint Line Does Not Guarantee the Natural Knee Kinematics: A Gait Analysis Evaluation Following Primary Total Knee Arthroplasty.
Arthroplast Today
December 2024
Südtiroler Sanitätsbetrieb, Department Orthopaedic Surgery, Brixen, Italy.
Background: Unrestricted kinematic alignment (uKA) in total knee arthroplasty (TKA) has the theoretical advantage of reproducing patients' constitutional alignment and restoring the pre-arthritic joint line position and obliquity. However, modifications of the original uKA technique have been proposed due to the potential risk of mechanical failure and instability. Given the significant variability in soft tissue behavior within the same bony morphology group, uKA pure knee resurfacing could be occasionally detrimental.
View Article and Find Full Text PDFExperimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions.
Biomed Eng Online
December 2024
Laboratory for Mechanical Systems Engineering, Empa, Dübendorf, Switzerland.
Background: Experimental knee implant wear testing according to ISO 14243 is a standard procedure, but it inherently possesses limitations for preclinical evaluations due to extended testing periods and costly infrastructure. In an effort to overcome these limitations, we hereby develop and experimentally validate a finite-element (FE)-based algorithm, including a novel cross-shear and contact pressure dependent wear and creep model, and apply it towards understanding the sensitivity of wear outcomes to the applied boundary conditions.
Methods: Specifically, we investigated the application of in vivo data for level walking from the publicly available "Stan" data set, which contains single representative tibiofemoral loads and kinematics derived from in vivo measurements of six subjects, and compared wear outcomes against those obtained using the ISO standard boundary conditions.
Estimations of biological motion walking direction are affected by observer and walker genders.
BMC Psychol
November 2024
Department of Psychology, The University of Hong Kong, Pok Fu Lam, Hong Kong.
A facing-towards bias is commonly reported when observers are asked to judge the motion directions of others. However, it remains unclear just how accurately observers are able to estimate the motion direction of others and whether the gender of the observer and the walker affects the direction estimation. Here, we asked male and female participants to estimate the direction of a point-light walker (PLW) in three experiments.
View Article and Find Full Text PDFMotor inhibition during voluntary gait initiation in young and older adults.
Sci Rep
November 2024
Institute of Movement and Sport Gerontology, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933, Cologne, Germany.
Based on a novel approach, this study explores feasibility and relevance of an inhibition task for studying age-related differences in motor inhibition during gait initiation. When presented with a go-signal, young adults (YA, n = 24) and older adults (OA, n = 55) were required to promptly initiate gait. Participants completed 3 blocks of 12 gait trials.
View Article and Find Full Text PDFMediolateral Margin of Stability highlights motor strategies for maintaining dynamic balance in older adults.
PLoS One
October 2024
Center for Digital Health & Social Innovation, St. Poelten University of Applied Sciences, St. Pölten, Austria.
The dynamical nature of gait increases fall risk for older adults as the Center of Mass (COM) is constantly displaced inside and outside the Base of Support (BOS). Foot placement and leg joint moments are the primary mechanisms controlling dynamic balance. The Margin of Stability (MOS) quantifies the distance between the COM dynamical state and the BOS.
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