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https://www.readbyqxmd.com/read/28072630/bracing-of-the-reconstructed-and-osteoarthritic-knee-during-high-dynamic-load-tasks
#1
Harvi F Hart, Kay M Crossley, Natalie J Collins, David C Ackland
PURPOSE: Lateral compartment osteoarthritis accompanied by abnormal knee biomechanics are frequently reported in individuals with knee osteoarthritis after anterior cruciate ligament reconstruction (ACLR). The aim of this study was to evaluate changes in knee biomechanics produced by an adjusted and unadjusted varus knee brace during high dynamic loading activities in individuals with lateral knee osteoarthritis after ACLR and valgus malalignment. METHODS: Nineteen participants who had undergone ACLR 5 to 20 years previously and had symptomatic and radiographic lateral knee osteoarthritis with valgus malalignment were assessed...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28064033/altered-gait-mechanics-and-elevated-serum-pro-inflammatory-cytokines-in-asymptomatic-patients-with-mri-evidence-of-knee-cartilage-loss
#2
Shannon N Edd, Julien Favre, Katerina Blazek, Patrick Omoumi, Jessica L Asay, Thomas P Andriacchi
OBJECTIVE: To test if sagittal plane gait mechanics parameters and serum inflammation levels differ between healthy asymptomatic subjects and asymptomatic subjects with magnetic resonance imaging (MRI) evidence of cartilage loss. DESIGN: Gait mechanics and resting serum tumor necrosis factor-α (TNFα) concentrations were measured for two groups of asymptomatic subjects recruited for a previous study: Pre-Osteoarthritis (OA) subjects had MRI evidence of partial- or full-thickness knee cartilage loss in at least one compartment (n=52 (30 female), 1...
January 4, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28002437/non-sagittal-knee-joint-kinematics-and-kinetics-during-gait-on-level-and-sloped-grounds-with-unicompartmental-and-total-knee-arthroplasty-patients
#3
Igor Komnik, Markus Peters, Johannes Funken, Sina David, Stefan Weiss, Wolfgang Potthast
After knee arthroplasty (KA) surgery, patients experience abnormal kinematics and kinetics during numerous activities of daily living. Biomechanical investigations have focused primarily on level walking, whereas walking on sloped surfaces, which is stated to affect knee kinematics and kinetics considerably, has been neglected to this day. This study aimed to analyze over-ground walking on level and sloped surfaces with a special focus on transverse and frontal plane knee kinematics and kinetics in patients with KA...
2016: PloS One
https://www.readbyqxmd.com/read/27987386/corrigendum-to-ankle-motion-influences-the-external-knee-adduction-moment-and-may-predict-who-will-respond-to-lateral-wedge-insoles-an-ancillary-analysis-from-the-silk-trial-osteoarthr-cartil-23-2015-1316-1322
#4
G J Chapman, M J Parkes, L Forsythe, D T Felson, R K Jones
No abstract text is available yet for this article.
December 14, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27984498/the-biomechanical-demands-on-the-hip-during-progressive-stepping-tasks
#5
Gillian L Hatfield, Jesse M Charlton, Christopher K Cochrane, Connor Hammond, Chris Napier, Judit Takacs, Natasha M Krowchuk, Michael A Hunt
Functional hip strengthening exercises are important components of lower extremity rehabilitation, and include single leg squats, step-downs, and step-ups. The biomechanical demand of these tasks is unclear. This repeated-measures study determined hip biomechanical demands in a healthy population. Twenty individuals (10 male, 26.6 +/- 5.1 years, 22.1 +/- 2.3 kg/m) participated. Three-dimensional motion, ground reaction force data, and surface electromyograms were recorded during four randomly-ordered tasks...
November 29, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27847840/the-effect-of-patellofemoral-pain-syndrome-on-gait-parameters-a-literature-review
#6
REVIEW
Mokhtar Arazpour, Fateme Bahramian, Atefeh Abutorabi, Seyed Taghi Nourbakhsh, Ardeshir Alidousti, Hamidreza Aslani
Patellofemoral pain syndrome (PFPS) is one of the most frequent causes of anterior knee pain in adolescents and adults. This disorder can have a big effect on patients' ability and quality of life and gait. This review included all articles published during 1990 to 2016. An extensive literature search was performed in databases of Science Direct, Google Scholar, PubMed and ISI Web of Knowledge using OR, AND, NOT between the selected keywords. Finally, 16 articles were selected from final evaluation. In PFPS subjects, there was lower gait velocity, decreased cadence, and reduced knee extensor moment in the loading response and terminal stance, delayed peak rear foot eversion during gait and greater hip adduction compared to healthy subjects, while for hip rotation, there was controversy in studies...
October 2016: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/27836677/the-effect-of-instruction-in-analgesic-use-compared-with-neuromuscular-exercise-on-knee-joint-load-in-patients-with-knee-osteoarthritis-a-randomized-single-blind-controlled-trial
#7
A Holsgaard-Larsen, B Clausen, J Søndergaard, R Christensen, T P Andriacchi, E M Roos
OBJECTIVE: To investigate the effect of a neuro-muscular exercise (NEMEX) therapy program compared with instructions in optimized analgesics and anti-inflammatory drug use (PHARMA), on measures of knee-joint load in people with mild to moderate knee osteoarthritis (OA). We hypothesized that knee joint loading during walking would be reduced by NEMEX and potentially increased by PHARMA. DESIGN: Single-blind, RCT comparing NEMEX therapy twice a week with PHARMA. Participants with mild-to-moderate medial tibiofemoral knee OA were randomly allocated (1:1) to one of two 8-week treatments...
November 9, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27816023/kinematics-and-kinetics-during-stair-ascent-in-individuals-with-gluteal-tendinopathy
#8
Kim Allison, Bill Vicenzino, Kim L Bennell, Tim V Wrigley, Alison Grimaldi, Paul W Hodges
BACKGROUND: Individuals with gluteal tendinopathy commonly report lateral hip pain and disability during stair ascent. This study aimed to compare kinematics and kinetics between individuals with and without gluteal tendinopathy during a step up task. METHODS: 35 individuals with unilateral gluteal tendinopathy and 35 pain-free controls underwent three-dimensional motion analysis of stance phase during stair ascent. An analysis of covariance was performed to compare hip, pelvis and trunk kinematic and kinetic variables between groups...
October 5, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27775183/asymptomatic-and-symptomatic-individuals-with-the-same-radiographic-evidence-of-knee-osteoarthritis-walk-with-different-knee-moments-and-muscle-activity
#9
Janie L Astephen Wilson, William D Stanish, Cheryl L Hubley-Kozey
There is an established discordance between the structural joint damage and clinical symptoms of knee osteoarthritis; however, there has been little investigation into the differences in joint level biomechanics and muscle activation patterns during gait between symptomatic and asymptomatic individuals with the same radiographic evidence of osteoarthritis. The objective of this study was to examine three-dimensional knee joint biomechanics and muscle activation differences during gait between asymptomatic and symptomatic individuals with radiographic knee osteoarthritis...
October 24, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27755353/predicting-the-functional-roles-of-knee-joint-muscles-from-internal-joint-moments
#10
Teresa E Flaxman, Tine Alkjær, Erik B Simonsen, Michael R Krogsgaard, Daniel L Benoit
INTRODUCTION: Knee muscles are commonly labelled as flexors or extensors and aptly stabilize the knee against sagittal plane loads. However, how these muscles stabilize the knee against adduction-abduction and rotational loads remains unclear. Our study sought to: (1) classify muscle roles as they relate to joint stability by quantifying the relationship between individual muscle activation patterns and internal net joint moments in all three loading planes, and (2) determine if these roles change with increasing force levels...
October 14, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27755283/hip-biomechanics-are-altered-in-male-runners-with-achilles-tendinopathy
#11
Mark W Creaby, Conor Honeywill, Melinda M Franettovich Smith, Anthony G Schache, Kay M Crossley
PURPOSE: Achilles tendinopathy (AT) is a prevalent injury in running sports. Understanding the biomechanical factors associated with AT will assist in its management and prevention. The purpose of this study was to compare hip and ankle kinematics and kinetics in runners with and without AT. METHODS: Fourteen male runners with AT and eleven healthy male runners (CTRL) ran over-ground whilst lower-limb joint motion and ground reaction force data were synchronously captured...
October 17, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27753742/changes-in-gait-over-a-30-min-walking-session-in-obese-females
#12
Bhupinder Singh, Huy Vo, Shelby L Francis, Kathleen F Janz, John H Yack
PURPOSE: This study assessed the biomechanical gait changes in obese and normal weight female adult subjects following a commonly recommended 30-minute walking session. Hip and knee adduction and extensor moments, which are the primary modulators of frontal and sagittal plane load distribution were hypothesized to increase in obese females following a 30-minute walking period, resulting in more stress across the hip and knee joint. METHODS: Ten obese (37.7 ± 4...
October 6, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27752084/effects-of-five-hindfoot-arthrodeses-on-foot-and-ankle-motion-measurements-in-cadaver-specimens
#13
Kun Zhang, Yanxi Chen, Minfei Qiang, Yini Hao
Single, double, and triple hindfoot arthrodeses are used to correct hindfoot deformities and relieve chronic pain. However, joint fusion may lead to dysfunction in adjacent articular surfaces. We compared range of motion in adjacent joints before and after arthrodesis to determine the effects of each procedure on joint motion. The theory of moment of couple, bending moment and balanced loading was applied to each of 16 fresh cadaver feet to induce dorsiflexion, plantarflexion, internal rotation, external rotation, inversion, and eversion...
October 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27747935/biomechanical-differences-related-to-leg-dominance-were-not-found-during-a-cutting-task
#14
E K Greska, N Cortes, S I Ringleb, J A Onate, B L Van Lunen
Previous studies have shown conflicting information regarding leg dominance as an etiological factor for the risk of anterior cruciate ligament (ACL) injuries. It remains unclear if lower extremity neuromechanical limb asymmetries exist in experienced athletes. The purpose of this study was to evaluate lower extremity neuromechanical effects of leg dominance in female collegiate soccer athletes during an unanticipated side-step cutting task. Twenty female collegiate soccer players completed an unanticipated side-step cutting task, using their dominant and non-dominant legs...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27747918/predictors-of-knee-joint-loading-after-anterior-cruciate-ligament-reconstruction
#15
Elizabeth Wellsandt, Ashutosh Khandha, Kurt Manal, Michael J Axe, Thomas S Buchanan, Lynn Snyder-Mackler
Anterior cruciate ligament (ACL) injury results in altered knee joint mechanics which frequently continue even after ACL reconstruction. The persistence of altered mechanical loading of the knee is of concern due to its likely role in the development of post-traumatic osteoarthritis (OA). Joint contact forces are associated with post-traumatic OA development, but evaluation of factors influencing the magnitude of contact forces after ACL injury is needed to advance current strategies aimed at preventing post-traumatic OA...
October 17, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27744006/varus-thrust-in-women-with-early-medial-knee-osteoarthritis-and-its-relation-with-the-external-knee-adduction-moment
#16
Armaghan Mahmoudian, Jaap H van Dieen, Sjoerd M Bruijn, Isabel Ac Baert, Gert S Faber, Frank P Luyten, Sabine Mp Verschueren
BACKGROUND: Varus thrust, defined as an abrupt increase of the knee varus angle during weight-bearing in gait, has been shown to be present in patients with moderate to severe knee osteoarthritis and is considered to be one of the risk factors for progression of symptomatic medial knee osteoarthritis. We evaluated the presence and magnitude of varus thrust and its relation with the Knee Adduction Moment in women with early medial knee osteoarthritis, and compared it to that in a group of controls and in a group of subjects with established medial knee osteoarthritis...
November 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27729290/effects-of-footwear-on-the-knee-adduction-moment-in-medial-knee-osteoarthritis-classification-criteria-for-flat-flexible-vs-stable-supportive-shoes
#17
K L Paterson, K L Bennell, T V Wrigley, B R Metcalf, J Kasza, R S Hinman
OBJECTIVE: To validate simple criteria that distinguish flat flexible from stable supportive walking shoes by comparing their effects on the knee adduction moment (KAM) in people with medial knee osteoarthritis (OA). DESIGN: This was a cross-sectional biomechanical study. We proposed five criteria to differentiate flat flexible from stable supportive shoes, and selected three pairs of shoes representing each class for biomechanical testing. 28 participants aged ≥50 years with symptomatic medial knee OA underwent gait analysis barefoot and wearing each of the six selected shoes, in random order...
October 10, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27720236/evaluation-of-foot-position-and-orientation-as-manipulated-variables-to-control-external-knee-adduction-moments-in-leg-extension-training
#18
Melanie Kolditz, Thivaharan Albin, Dirk Abel, Alessandro Fasse, Gert-Peter Brüggemann, Kirsten Albracht
BACKGROUND AND OBJECTIVE: Effective leg extension training at a leg press requires high forces, which need to be controlled to avoid training-induced damage. In order to avoid high external knee adduction moments, which are one reason for unphysiological loadings on knee joint structures, both training movements and the whole reaction force vector need to be observed. In this study, the applicability of lateral and medial changes in foot orientation and position as possible manipulated variables to control external knee adduction moments is investigated...
September 27, 2016: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/27718393/the-effects-of-fatigue-on-lower-extremity-kinematics-kinetics-and-joint-coupling-in-symptomatic-female-runners-with-iliotibial-band-syndrome
#19
Allison M Brown, Rebecca A Zifchock, Howard J Hillstrom, Jinsup Song, Carole A Tucker
BACKGROUND: Altered hip and knee kinematics and joint coupling have been documented in runners with iliotibial band syndrome. Symptoms often present themselves after several minutes of running, yet the effect of fatigue warrants further exploration. The purpose of this study was to determine the effect of a run to fatigue in runners with iliotibial band syndrome, as compared to healthy controls. METHODS: Twenty uninjured and 12 female runners with iliotibial band syndrome performed a treadmill run to fatigue...
November 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27697627/body-weight-unloading-modifications-on-frontal-plane-joint-moments-impulses-and-center-of-pressure-during-overground-gait
#20
Arielle G Fischer, Alon Wolf
BACKGROUND: Body weight unloading is a common method of gait rehabilitation. However, little is known about its effects on the overground gait biomechanical parameters which were often confounded by the walking modality (treadmill) or the speed variability when subjects walked overground while having to pull the body weight unloading system to which they were attached. By designing a mechanical device that pulled the system at a constant speed, we were able to assess the unique effects of body weight unloading on healthy subjects' kinetics during overground gait...
November 2016: Clinical Biomechanics
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