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Adduction moment

Felix Stief, André Schmidt, Stefan van Drongelen, Katharina Lenarz, Dara Froemel, Timur Tarhan, Frederick Lutz, Andrea Meurer
A total hip replacement (THR) is a common and routine procedure to reduce pain and restore normal activity. Gait analysis can provide insights into functional characteristics and dynamic joint loading situation not identifiable by clinical examination or static radiographic measures. The present prospective longitudinal study tested whether two years after surgery a THR would restore dynamic loading of the knee and hip joints in the frontal plane to normal. Instrumented gait analysis was performed shortly before surgery and approximately two years after THR on 15 unilateral hip osteoarthritis patients...
March 14, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Takuma Inai, Tomoya Takabayashi, Mutsuaki Edama, Masayoshi Kubo
BACKGROUND: Decreasing the daily cumulative hip moments in the frontal and sagittal planes may lower the risk of hip osteoarthritis. Therefore, it may be important to evaluate factors that affect hip moment impulse during gait. RESEARCH QUESTION: It is unclear what factors affect hip moment impulse during gait. This systematic review aimed to evaluate different factors that affect hip moment impulse during gait in healthy adults and patients with hip osteoarthritis...
February 19, 2018: Gait & Posture
Kim Allison, Michelle Hall, Paul W Hodges, Tim V Wrigley, Bill Vicenzino, Yong-Hao Pua, Ben Metcalf, Alison Grimaldi, Kim L Bennell
BACKGROUND: Gluteal tendinopathy (GT) and hip osteoarthritis (OA) are the most common causes of hip pain and associated disability in older adults. Pain and altered walking biomechanics are common to both conditions. This study aimed to compare three-dimensional walking biomechanics between individuals with unilateral, symptomatic GT and HOA. METHODS: Sixty individuals with symptomatic unilateral GT confirmed by magnetic-resonance-imaging and 73 individuals with symptomatic unilateral HOA (Kellgren-Lawrence Grade ≥ 2) underwent three-dimensional gait analysis...
February 12, 2018: Gait & Posture
Robert M Barker-Davies, Andrew Roberts, Alexander N Bennett, Daniel T P Fong, Patrick Wheeler, Mark P Lewis
BACKGROUND: Single leg squats are commonly used subjective assessments of general biomechanical function, injury risk, as a predictor for recovery and as an outcome measure of rehabilitation. While 3D motion capture is a useful tool for elite sports performance and research it is impractical for routine clinical use. RESEARCH QUESTION: This cross-sectional study aims to: assess reliability and validity of clinicians' subjective ratings of single leg squats compared to 3D motion capture, and to identify whether performance predicts joint moments...
February 21, 2018: Gait & Posture
S Miller, A Agarwal, W B Haddon, L Johnston, G Arnold, W Wang, R J Abboud
Introduction The aim of this study was to compare kinetical data from gait analysis of patients who have undergone total and uni-condylar knee replacement. Materials and methods Thirteen patients with unilateral total knee arthroplasty (TKA) and 13 unicondylar knee arthroplasty (UKA), were included, all performed by the same surgeon more than one year prior. The Vicon gait analysis system was used. Statistical power was calculated using SPSS. Results No significant difference was found in the spatiotemporal parameters of gait and survival years of the knee prosthesis between the two groups...
February 27, 2018: Annals of the Royal College of Surgeons of England
Prasanna Sritharan, Yi-Chung Lin, Sara E Richardson, Kay M Crossley, Trevor B Birmingham, Marcus G Pandy
This study quantified the contributions by muscular, gravitational and inertial forces to the ground reaction force (GRF) and external knee adduction moment (EKAM) for knee osteoarthritis (OA) patients and controls walking at similar speeds. Gait data for 39 varus mal-aligned medial knee OA patients and 15 controls were input into musculoskeletal models to calculate the contributions of individual muscles and gravity to the fore-aft (progression), vertical (support), and mediolateral (balance) GRF, and the EKAM...
February 23, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Yong Nie, Jun Ma, ZeYu Huang, Bin Xu, Shuo Tang, Bin Shen, Virginia Byers Kraus, FuXing Pei
To investigate the change in clinical outcomes and biomechanical properties of the knee in response to upper partial fibulectomy. Sixteen patients with medial compartment knee osteoarthritis (KOA) underwent upper partial fibulectomy. Visual analog scale (VAS) pain, the hospital for special surgery knee score (HSS), hip-knee-ankle (HKA) angle (measured in the frontal plane), and flexion/extension range of motion of the knee were assessed before and up to 6 months after surgery. Patients were evaluated for gait parameters and overall peak knee adduction moment (KAM)...
December 13, 2017: Journal of Biomechanics
Yu Zeng, Sarah Crews
Many ambush predators attack prey using rapid strikes, but these strikes are typically only anteriorly directed. However, a predator may attack laterally- and posteriorly-oriented prey if it can couple the strikes with rapid body reorientation. Here, we examined omnidirectional strikes in flattie spiders (Selenopidae), a group of sit-and-wait ambush predators found on open surfaces. These spiders attack prey throughout their entire peripheral range using rapid strikes that consist of rapid translation and rotation toward the prey...
February 12, 2018: Journal of Experimental Biology
A A Williams, M R Titchenal, T P Andriacchi, C R Chu
OBJECTIVE: Quantitative magnetic resonance imaging (MRI) ultrashort echo time (UTE) T2* is sensitive to cartilage deep tissue matrix changes after anterior cruciate ligament reconstruction (ACLR). This study was performed to determine whether UTE-T2* profile analysis is a useful clinical metric for assessing cartilage matrix degeneration. This work tests the hypotheses that UTE-T2* depthwise rates of change (profile slopes) correlate with clinical outcome metrics of walking mechanics and patient reported outcomes (PRO) in patients 2 years after ACLR...
February 7, 2018: Osteoarthritis and Cartilage
K L Paterson, L Sosdian, R S Hinman, T V Wrigley, J Kasza, M Dowsey, P Choong, K L Bennell
BACKGROUND: Gait biomechanics, sex, and obesity can contribute to suboptimal outcomes from primary total knee arthroplasty. The aims of this study were to i) determine if sex and/or obesity influence the amount of change in gait biomechanics from pre-surgery to six months post-surgery and; ii) assess if gait returns to normal in men and women. METHODS: Three-dimensional gait analysis was performed on 43 patients undergoing primary total knee arthroplasty for knee osteoarthritis (pre- and six months post-operative) and 40 asymptomatic controls...
January 29, 2018: Gait & Posture
Saad Jawaid Khan, Soobia Saad Khan, Juliana Usman, Abdul Halim Mokhtar, Noor Azuan Abu Osman
OBJECTIVE: To test the hypothesis that toe-in gait (TI) will further reduce first peak (Knee Adduction Moment) KAM and decrease balance when combined with a knee brace (KB) and laterally wedged insoles (LWI) in medial knee osteoarthritis (kOA) patients. PARTICIPANTS: Twenty patients with bilateral symptomatic medial kOA. INTERVENTIONS: 4-point leverage-based KB, full-length LWI with 5° inclination and toe-in gait (TI). MAIN OUTCOME MEASURES: First and second peak knee adduction moment (fKAM and sKAM respectively), balance and pain...
January 29, 2018: Gait & Posture
Ryan Mahaffey, Stewart C Morrison, Paul Bassett, Wendy I Drechsler, Mary C Cramp
BACKGROUND: Childhood obesity is associated with musculoskeletal dysfunction and altered lower limb biomechanics during gait. Few previous studies have explored relationships between childhood obesity measured by body fat and lower limb joint waveform kinematics and kinetics. RESEARCH QUESTION: What is the association between body fat and hip, knee and ankle joint angles and moments during gait and in 7 to 11 year-old boys? METHODS: Fifty-five boys participated in the study...
February 2, 2018: Gait & Posture
Bryant C Roberts, Lucian B Solomon, Graham Mercer, Karen J Reynolds, Dominic Thewlis, Egon Perilli
OBJECTIVE: To study, in end-stage knee osteoarthritis (OA) patients, relationships between indices of in vivo dynamic knee joint loads obtained pre-operatively using gait analysis, static knee alignment, and the subchondral trabecular bone (STB) microarchitecture of their excised tibial plateau quantified with 3D micro-CT. DESIGN: Twenty-five knee OA patients scheduled for total knee arthroplasty underwent pre-operative gait analysis. Mechanical axis deviation (MAD) was determined radiographically...
January 27, 2018: Osteoarthritis and Cartilage
Christopher D Stickley, Melanie M Presuto, Kara N Radzak, Christina M Bourbeau, Ronald K Hetzler
CONTEXT:   Although the risk of osteoarthritis development after acute knee injury has been widely studied, the long-term consequences of knee overuse injury are not well understood. OBJECTIVE:   To identify the relationship between gait-related risk factors osteoarthritis and the development of iliotibial band syndrome (ITBS) in members of a single University Army Reserve Officers' Training Corps (ROTC) unit. DESIGN:   Prospective cohort study...
January 26, 2018: Journal of Athletic Training
Tyler N Brown, Jonathan T Kaplan, Sarah E Cameron, Kayla D Seymore, John W Ramsay
Osteoarthritis (OA) is a common occupational hazard for service members. This study quantified how body borne load impacts knee biomechanics for participants who do and do not present varus thrust (range of knee adduction motion exhibited from heel strike to mid-stance (0-51%)) during over-ground running. Eighteen (9 varus thrust and 9 control) military personnel had knee biomechanics recorded when running with three load conditions (light, ∼6 kg, medium, 15% BW, and heavy, 30% BW). Subject-based means for knee biomechanics were calculated and submitted to a RM ANOVA to test the main effects and possible interactions between load and varus thrust group...
January 16, 2018: Journal of Biomechanics
Xiangbin Wang, Xuerong Xie, Meijin Hou, Xiaoling Wang, Jian Chen, Jiao Yu, Xiang Li
OBJECTIVE: To observe the kinetic change that reflects joint loading in different planes during stair climbing in knee osteoarthritis (KOA) after electroacupuncture (EA) by three-dimensional motion analysis, so as to provide reference for its biomechanical mechanism treated with acupuncture. METHODS: Forty KOA patients, in accordance with the random number table, were assigned into an observation group and a control group, 20 cases in each one and finally 18 cases completed...
October 12, 2017: Zhongguo Zhen Jiu, Chinese Acupuncture & Moxibustion
Roman Farana, Timothy Exell, Gerda Strutzenberger, Gareth Irwin
Biophysical loading of the elbow and wrist is a potential reason for chronic lesions in gymnastics and present a real concern for coaches, scientist and clinicians. Previous research has identified injury risk factors during round-off (RO) skills in elite female gymnasts. The aim of this study was to investigate key elbow and wrist joint injury risk factors during different techniques of fundamental cartwheel (CW) and RO skills performed by young female artistic gymnasts. Seventeen active young female gymnasts performed 30 successful trials of both CW and RO from a hurdle step with three different hand positions (parallel (10), T-shape (10) and reverse (10))...
January 17, 2018: European Journal of Sport Science
I C D Fong, W S C Li, W K J Tai, T W R Tsang, J H Zhang, T L W Chen, H Baur, P Eichelberger, R T H Cheung
BACKGROUND: Knee adduction moment (KAM) is often used as a surrogate marker of knee contact force (KCF) during walking. Previous studies have reported potential benefits to reduce KAM in patients with knee osteoarthritis (OA) by foot progression angle adjustment. However, KAM is an external moment and it does not consider any muscle contribution to the joint loading, which should pose a greater influence in running than walking. RESEARCH QUESTION: This study used a computational model to compare KAM and KCF between runners with and without knee OA during running...
December 30, 2017: Gait & Posture
Michael M Lerch, Miroslav Medved, Andrea Lapini, Adèle D Laurent, Alessandro Iagatti, Laura Bussotti, Wiktor Szymanski, Wybren Jan Buma, Paolo Foggi, Mariangela Di Donato, Ben L Feringa
Donor acceptor Stenhouse adducts (DASAs) are a rapidly emerging class of visible light-activatable negative photochromes. They are closely related to (mero)cyanine dyes with the sole difference being a hydroxy group in the polyene chain. The presence or absence of the hydroxy group has far-reaching consequences for the photochemistry of the compound: cyanine dyes are widely used as fluorescent probes, whereas DASAs hold great promise for visible-light-triggered photoswitching. Here we analyze the photophysical properties of a DASA lacking the hydroxy group...
December 24, 2017: Journal of Physical Chemistry. A
Andreas Brand, Isabella Klöpfer-Krämer, Mario Morgenstern, Inga Kröger, Björn Michel, Andreas Thannheimer, Janina Anna Müßig, Peter Augat
BACKGROUND: Valgus bracing in medial knee osteoarthritis aims to improve gait function by reducing the loading of the medial compartment. Orthosis composition and optimal adjustment is essential to achieve biomechanical and clinical effectiveness. OBJECTIVES: To investigate biomechanical functionality during gait, pain relief and compliance in patients with knee osteoarthritis using a lightweight adjustable knee unloader orthosis. STUDY DESIGN: Prospective observational clinical trial...
December 2017: Prosthetics and Orthotics International
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