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https://www.readbyqxmd.com/read/29776821/wide-step-width-reduces-knee-abduction-moment-of-obese-adults-during-stair-negotiation
#1
Derek Yocum, Joshua T Weinhandl, Jeffrey T Fairbrother, Songning Zhang
PURPOSE: An increased likelihood of developing obesity-related knee osteoarthritis may be associated with increased peak internal knee abduction moments (KAbM). Increases in step width (SW) may act to reduce this moment. The purpose of this study was to determine the effects of increased SW on knee biomechanics during stair negotiation of healthy-weight and obese participants. METHODS: Participants (24: 10 obese and 14 healthy-weight) used stairs and walked over level ground while walking at their preferred speed in two different SW conditions - preferred and wide (200% preferred)...
May 15, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29769833/effects-of-knee-alignments-and-toe-clip-on-frontal-plane-knee-biomechanics-in-cycling
#2
Guangping Shen, Songning Zhang, Hunter J Bennett, James C Martin, Scott E Crouter, Eugene C Fitzhugh
Effects of knee alignment on the internal knee abduction moment (KAM) in walking have been widely studied. The KAM is closely associated with the development of medial knee osteoarthritis. Despite the importance of knee alignment, no studies have explored its effects on knee frontal plane biomechanics during stationary cycling. The purpose of this study was to examine the effects of knee alignment and use of a toe clip on the knee frontal plane biomechanics during stationary cycling. A total of 32 participants (11 varus, 11 neutral, and 10 valgus alignment) performed five trials in each of six cycling conditions: pedaling at 80 rpm and 0...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29761113/differences-in-hip-joint-biomechanics-and-muscle-activation-in-individuals-with-femoroacetabular-impingement-compared-with-healthy-asymptomatic-individuals-is-level-ground-gait-analysis-enough
#3
Derek J Rutherford, Janice Moreside, Ivan Wong
Background: Femoroacetabular impingement (FAI) is a recognized cause of hip and groin pain and a significant factor in hip joint function during sport. Objective tests for understanding hip function are lacking in this population. Purpose: To determine whether biomechanical and electromyographic features of hip function during level-ground walking differ between a group diagnosed with FAI and those with no symptoms of FAI. Study Design: Controlled laboratory study...
May 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29755793/timing-of-frontal-plane-trunk-lean-not-magnitude-mediates-frontal-plane-knee-joint-loading-in-patients-with-moderate-medial-knee-osteoarthritis
#4
Freyja Hálfdanardóttir, Dan K Ramsey, Kristín Briem
The purpose of this study was to examine the influence of trunk lean and contralateral hip abductor strength on the peak knee adduction moment (KAM) and rate of loading in persons with moderate medial knee osteoarthritis. Thirty-one males (17 with osteoarthritis, 14 controls) underwent 3-dimensional motion analysis, strength testing of hip abductors, and knee range of motion (ROM) measures, as well as completing the knee osteoarthritis outcome score (KOOS). No differences were found between groups or limbs for gait cycle duration, but the osteoarthritis group had longer double-limb support during weight acceptance ( p < 0...
2018: Advances in Orthopedics
https://www.readbyqxmd.com/read/29747079/mechanical-effects-of-medial-and-lateral-wedged-orthoses-during-running
#5
Jonathan Sinclair
OBJECTIVE: The aim of the current investigation was to examine the effects of orthoses with 5° medial and lateral wedges on knee joint kinetics during the stance phase of running. DESIGN: Repeated measures. SETTING: Laboratory. PARTICIPANTS: Twelve recreational runners. OUTCOME MEASUREMENTS: Twelve male participants ran over a force platform at 4.0 m/s in three different conditions (medial orthotic, lateral orthotic and no-orthotic)...
May 3, 2018: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29739301/sub-elite-football-players-with-hip-related-groin-pain-and-positive-flexion-adduction-internal-rotation-test-exhibit-distinct-biomechanical-differences-compared-with-the-asymptomatic-side
#6
Matthew G King, Adam I Semciw, Harvi F Hart, Anthony G Schache, Kane J Middleton, Josh J Heerey, Rintje Agricola, Kay M Crossley
Study Design Observational cross-sectional study. Background Hip-related groin pain is common in sub-elite football players and may be associated with altered hip biomechanics. Objectives To compare the hip biomechanics, bony hip morphology associated with femoroacetabular impingement (FAI) syndrome, and hip strength and range of motion between the symptomatic and asymptomatic limb of sub-elite football players with unilateral hip-related groin pain and a positive flexion adduction internal rotation test. Methods Fifteen sub-elite football (soccer) players with unilateral hip-related groin pain and a positive flexion adduction internal rotation test were recruited...
May 8, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29734841/gait-asymmetries-in-unilateral-symptomatic-hip-osteoarthritis-and-their-association-with-radiographic-severity-and-pain
#7
Gary J Farkas, Bryan R Schlink, Louis F Fogg, Kharma C Foucher, Markus A Wimmer, Najia Shakoor
INTRODUCTION: Little is known about the loading patterns in unilateral hip osteoarthritis (OA) and their relationship to radiographic severity and pain. We aimed to examine the loading patterns at the hips of those with unilateral symptomatic hip OA and identify associations between radiographic severity and pain with loading alterations. METHODS: Sixty-one subjects with symptomatic unilateral hip OA underwent gait analyses and evaluation for radiographic severity (Kellgren-Lawrence [KL]-grade) and pain (visual analogue scale) at bilateral hips...
May 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29729613/effect-of-lateral-wedge-length-on-ambulatory-knee-kinetics
#8
Arielle G Fischer, Baptiste Ulrich, Laurent Hoffmann, Brigitte M Jolles, Julien Favre
BACKGROUND: Lateral wedge insoles (LWI) were proposed to treat medial knee osteoarthritis through reductions of the ambulatory knee adduction moment (KAM). Limited attention was however paid to the LWI length, resulting in unclear understanding of its effect on KAM reductions. The knee flexion moment (KFM) was also shown to be important in knee osteoarthritis, but little is known about the effect of LWI length on it. RESEARCH QUESTION: This study aimed to compare the KAM and KFM of healthy subjects walking with four different lengths of LWI, explicitly without LWI and with LWI below the hindfoot (HF), below the hindfoot and forefoot (HF + FF) and below the hindfoot, forefoot and hallux (HF + FF + HX) segments...
April 27, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29727776/knee-adduction-moment-peak-and-impulse-do-not-change-during-the-first-six-months-of-walking-with-a-prosthesis
#9
Rebecca L Krupenevich, Ross H Miller, Brad D Hendershot, Barri L Schnall, Alison L Pruziner
BACKGROUND: Individuals with unilateral lower limb loss are at increased risk for developing knee osteoarthritis in their contralateral limb. The mechanisms underlying this phenomenon are unknown, but large or unusual loads on the limb are thought to contribute to osteoarthritis development. Yet, to our knowledge, there have been no longitudinal assessments of knee joint kinetics to assist with identifying the origin or progression of such loads. RESEARCH QUESTION: This study aimed to examine knee joint kinetics of individuals with lower limb loss as a function of time from independent ambulation...
April 26, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29715509/relationship-between-knee-joint-contact-forces-and-external-knee-joint-moments-in-patients-with-medial-knee-osteoarthritis-effects-of-gait-modifications
#10
R E Richards, M S Andersen, J Harlaar, J C van den Noort
OBJECTIVE: To evaluate i) the relationship between the knee contact force (KCF) and knee adduction and flexion moments (KAM and KFM) during normal gait in people with medial knee osteoarthritis (KOA), ii) to evaluate the effects on the KCF of walking with a modified gait pattern and iii) to evaluate the relationship between changes in the KCF and changes in the knee moments. METHOD: We modeled the gait biomechanics of thirty-five patients with medial KOA using the AnyBody Modeling System during normal gait and two modified gait patterns...
April 28, 2018: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29709498/clinical-and-biomechanical-changes-following-a-four-month-toe-out-gait-modification-program-for-people-with-medial-knee-osteoarthritis-a-randomized-controlled-trial
#11
Michael A Hunt, Jesse M Charlton, Natasha M Krowchuk, Calvin T Tse, Gillian L Hatfield
OBJECTIVE: To compare changes in knee pain, function, and loading following a four-month progressive walking program with or without toe-out gait modification program in people with medial tibiofemoral knee osteoarthritis. DESIGN: Individuals with medial knee osteoarthritis were randomized to a four month program to increase walking activity with (toe-out) or without (progressive walking) concomitant toe-out gait modification. The walking program was similar between the two groups, except that the gait modification group were trained to walk with 15° more toe-out...
April 27, 2018: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29704285/walking-velocity-and-step-length-adjustments-affect-knee-joint-contact-forces-in-healthy-weight-and-obese-adults
#12
Clare E Milner, Stacey A Meardon, Jillian L Hawkins, John D Willson
Knee osteoarthritis is a major public health problem and adults with obesity are particularly at risk. One approach to alleviating this problem is to reduce the mechanical load at the joint during daily activity. Adjusting temporospatial parameters of walking could mitigate cumulative knee joint mechanical loads. The purpose of this study was to determine how adjustments to velocity and step length affects knee joint loading in healthy weight adults and adults with obesity. We collected three-dimensional gait analysis data on 10 adults with a normal body mass index and 10 adults with obesity during over ground walking in nine different conditions...
April 28, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29673934/foot-structure-and-knee-joint-kinetics-during-walking-with-and-without-wedged-footwear-insoles
#13
Ryan T Lewinson, Ryan Madden, Anthony Killick, John W Wannop, J Preston Wiley, Victor M Y Lun, Chirag Patel, Jeremy M LaMothe, Darren J Stefanyshyn
The relationship between static foot structure characteristics and knee joint biomechanics during walking, or the biomechanical response to wedged insoles are currently unknown. In this study, 3D foot scanning, dual X-ray absorptiometry and gait analysis methods were used to determine structural parameters of the foot and assess their relation to knee joint loading and biomechanical response to wedged insoles in 30 patients with knee osteoarthritis. In multiple linear regression models, foot fat content, height of the medial longitudinal arch and static hind foot angle were not associated with the magnitude of the knee adduction moment (R2  = 0...
April 12, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29664955/efficacy-of-a-biomechanically-based-yoga-exercise-program-in-knee-osteoarthritis-a-randomized-controlled-trial
#14
Alexander B Kuntz, Jaclyn N Chopp-Hurley, Elora C Brenneman, Sarah Karampatos, Emily G Wiebenga, Jonathan D Adachi, Michael D Noseworthy, Monica R Maly
OBJECTIVE: Certain exercises could overload the osteoarthritic knee. We developed an exercise program from yoga postures with a minimal knee adduction moment for knee osteoarthritis. The purpose was to compare the effectiveness of this biomechanically-based yoga exercise (YE), with traditional exercise (TE), and a no-exercise attention-equivalent control (NE) for improving pain, self-reported physical function and mobility performance in women with knee osteoarthritis. DESIGN: Single-blind, three-arm randomized controlled trial...
2018: PloS One
https://www.readbyqxmd.com/read/29643592/does-trampoline-or-hard-surface-jumping-influence-lower-extremity-alignment
#15
Kiyokazu Akasaka, Akihiro Tamura, Aoi Katsuta, Ayako Sagawa, Takahiro Otsudo, Yu Okubo, Yutaka Sawada, Toby Hall
[Purpose] To determine whether repetitive trampoline or hard surface jumping affects lower extremity alignment on jump landing. [Subjects and Methods] Twenty healthy females participated in this study. All subjects performed a drop vertical jump before and after repeated maximum effort trampoline or hard surface jumping. A three-dimensional motion analysis system and two force plates were used to record lower extremity angles, moments, and vertical ground reaction force during drop vertical jumps. [Results] Knee extensor moment after trampoline jumping was greater than that after hard surface jumping...
December 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29629450/first-principles-investigation-of-the-lewis-acid-base-adduct-formation-at-the-methylammonium-lead-iodide-surface
#16
Giacomo Giorgi, Koichi Yamashita, Hiroshi Segawa
We have here performed a campaign of ab initio calculations focusing on the anchoring mechanism and adduct formation of some Lewis bases, both aliphatic and aromatic, on a PbI2-rich flat (001) methylammonium lead iodide (MAPI) surface. Our goal is to provide theoretical support to the recently reported experimental techniques of MAPI surface passivation via Lewis acid-base neutralization and similarly of MAI·PbI2·(Lewis base) adduct formation. We tested several X-donor bases (X = :N, :O, :S), paying attention to the thermodynamic stability of the final MAPI·base adducts and to their electronic properties...
April 9, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29611879/changes-in-the-total-knee-joint-moment-in-patients-with-medial-compartment-knee-osteoarthritis-over-five-years
#17
Jessica L Asay, Jennifer C Erhart-Hledik, Thomas P Andriacchi
Progression of medial compartment knee osteoarthritis (OA) has been associated with repetitive mechanical loading during walking, often characterized by the peak knee adduction (KAM) and knee flexion moments (KFM). However, the relative contributions of these components to the knee total joint moment (TJM) can change as the disease progresses since KAM and KFM are influenced by different factors that change over time. This study tested the hypothesis that the relative contributions of KAM, KFM, and the rotational moment (KRM) to the TJM change over time in subjects with medial compartment knee OA...
April 3, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29609157/acute-and-mid-term-six-week-effects-of-an-ankle-foot-orthosis-on-biomechanical-parameters-clinical-outcomes-and-physical-activity-in-knee-osteoarthritis-patients-with-varus-malalignment
#18
Maik Sliepen, Elsa Mauricio, Dieter Rosenbaum
BACKGROUND: Knee osteoarthritis (KOA) is a painful disease commonly caused by high loads on the articular cartilage. Orthotic interventions aim to reduce mechanical loading, thereby alleviating pain. Traditional orthotics appear effective, but high drop-out rates have been reported over prolonged periods. RESEARCH QUESTION: The aim of this study was to examine the effect of a novel ankle-foot orthosis (AFO) on gait parameters, physical function and activity of KOA patients...
March 26, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29593820/prophylaxis-of-medial-compartment-gonarthrosis-in-varus-knee-current-state-of-knowledge
#19
Anna Fryzowicz, Lechosław B Dworak, Paweł Koczewski
The progression of gonarthrosis results in reduction of physical activity. One of the factors that increase the risk of osteoarthrosis may be joint overload related to the malalignment of the mechanical axis of the lower extremity. The medial compartment (MC) of the knee is particularly susceptible to overload due to the external knee adduction moment (EKAM). Varus knee malalignment contributes to increased EKAM and thus results in increased MC loading. The purpose of this study is to present methods described in current literature aimed at reducing the disproportion in the distribution of loads on articular surfaces of medial and lateral knee compartments in people with varus knee malalignment...
March 2018: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/29560494/frontal-plane-tibiofemoral-alignment-is-strongly-related-to-compartmental-knee-joint-contact-forces-and-muscle-control-strategies-during-stair-ascent
#20
Hunter J Bennett, Joshua T Weinhandl, Kristina Fleenor, Songning Zhang
Static frontal plane tibiofemoral alignment is an important factor in dynamic knee alignment and knee adduction moments. However, little is known about the relationship between alignment and compartment contact forces or muscle control strategies. The purpose of this study was to estimate medial (MCF) and lateral (LCF) compartment knee joint contact forces and muscle forces during stair ascent using a musculoskeletal model implementing subject specific knee alignments. Kinematic and kinetic data from 20 healthy individuals with radiographically confirmed varus or valgus knee alignments were simulated using alignment specific models to predict MCFs and LCFs...
March 12, 2018: Journal of Biomechanical Engineering
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