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https://www.readbyqxmd.com/read/29223778/differences-in-trochlear-parameters-between-native-and-prosthetic-kinematically-or-mechanically-aligned-knees
#1
C Rivière, F Iranpour, S Harris, E Auvinet, A Aframian, S Parratte, J Cobb
INTRODUCTION: Kinematic (KA) and mechanical (MA) alignment techniques are two different philosophies of implant positioning that use the same TKA implants. This might generate differences in the resulting prosthetic trochlea parameters between the two techniques of alignment. Our study aim was to test the following hypotheses: 1) Mechanically or kinematically aligned femoral implant understuffs the native trochlear articular surface and poorly restores the native groove orientation, and 2) The orientation of the prosthetic trochlear groove and trochlear fill are different between MA and KA...
December 6, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29214918/effects-of-knee-orthosis-adjustment-on-biomechanical-performance-and-clinical-outcome-in-patients-with-medial-knee-osteoarthritis
#2
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
https://www.readbyqxmd.com/read/29214465/the-peripheral-soft-tissues-should-not-be-ignored-in-the-finite-element-models-of-the-human-knee-joint
#3
Hamid Naghibi Beidokhti, Dennis Janssen, Sebastiaan van de Groes, Nico Verdonschot
In finite element models of the either implanted or intact human knee joint, soft tissue structures like tendons and ligaments are being incorporated, but usually skin, peripheral knee soft tissues, and the posterior capsule are ignored and assumed to be of minor influence on knee joint biomechanics. It is, however, unknown how these peripheral structures influence the biomechanical response of the knee. In this study, the aim was to assess the significance of the peripheral soft tissues and posterior capsule on the kinematics and laxities of human knee joint, based on experimental tests on three human cadaveric specimens...
December 7, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29214458/the-effects-of-uninvolved-side-epiphysiodesis-for-limb-length-equalization-in-children-with-unilateral-cerebral-palsy-clinical-evaluation-with-the-edinburgh-visual-gait-score
#4
Marco Corradin, Roberto Schiavon, Andrea Borgo, Jacques Deslandes, Antonella Cersosimo, Federico Canavese
PURPOSE: Hemiplegic cerebral palsy patient may present a shorten leg on the hemiplegic side that afflicts negatively the kinematic of the uninvolved limb. Thus, the aim of this study was to investigate the modification of gait kinematic after epiphysiodesis for limb equalization and secondary to verify the prediction of correction. METHODS: Skeletally immature hemiplegic patients with a minimum limb leg discrepancy (LLD) of 2.5 cm were treated with epiphysiodesis of the unaffected knee and clinically evaluated with Edinburgh visual gait score (EVGS)...
December 6, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29214168/how-well-can-modern-nonhabitual-barefoot-youth-adapt-to-barefoot-and-minimalist-barefoot-technology-shoe-walking-in-regard-to-gait-symmetry
#5
Y Xu, Q Hou, C Wang, T Simpson, B Bennett, S Russell
We aim to test how well modern nonhabitual barefoot people can adapt to barefoot and Minimalist Bare Foot Technology (MBFT) shoes, in regard to gait symmetry. 28 healthy university students (22 females/6 males) were recruited to walk on a 10-meter walkway randomly on barefoot, in MBFT shoes, and in neutral running shoes at their comfortable walking speed. Kinetic and kinematic data were collected using an 8-camera motion capture system. Data of joint angles, joint forces, and joint moments were extracted to compute a consecutive symmetry index...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29209417/do-athletes-alter-their-running-mechanics-after-an-achilles-tendon-rupture
#6
Daniel Jandacka, Julia Freedman Silvernail, Jaroslav Uchytil, David Zahradnik, Roman Farana, Joseph Hamill
Background: Over the past thirty years, there has been dramatic increase in incidence of Achilles tendon rupture in the athletic population. The purpose of this study was to compare the lower extremity mechanics of Achilles tendon ruptured runners with healthy controls. Methods: The participants with a past history of an Achilles tendon repair (n = 11) and healthy control (n = 11) subgroups were matched on sex, age, type of regular physical activity, mass, height, footfall pattern and lateral dominancy...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/29204861/kinematically-aligned-total-knee-arthroplasty-reduces-knee-adduction-moment-more-than-mechanically-aligned-total-knee-arthroplasty
#7
Yasuo Niki, Takeo Nagura, Katsuya Nagai, Shu Kobayashi, Kengo Harato
PURPOSE: Knee adduction moment (KAM) has been recognized as a good clinical surrogate for medial tibiofemoral joint loading and is associated with implant durability after total knee arthroplasty (TKA). This study aimed to examine the effects of joint line obliquity in kinematically aligned TKA (KA-TKA) on KAM during gait. METHODS: The study enrolled 21 knees from 18 patients who underwent cylindrical axis reference KA-TKA and a matched group of 21 knees from 18 patients who underwent mechanically aligned (MA)-TKA as controls...
December 4, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29204503/bicompartmental-knee-arthroplasty-vs-total-knee-arthroplasty-for-the-treatment-of-medial-compartment-and-patellofemoral-osteoarthritis
#8
Sahil Kooner, Herman Johal, Marcia Clark
Background: Interest in bicompartmental knee arthroplasty (BKA) for the treatment of medial patellofemoral osteoarthritis (MPFOA) has grown in recent years because BKA offers a bone and ligament-preserving alternative to total knee arthroplasty (TKA). BKA only resurfaces the diseased compartments, while preserving proprioception and native knee kinematics. Therefore, the objective of this study is to assess knee function, perioperative morbidity, and implant survivability in patients undergoing BKA vs TKA for MPFOA...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29200662/gearing-effects-of-the-patella-knee-extensor-muscle-sesamoid-of-the-helmeted-guineafowl-during-terrestrial-locomotion
#9
V R Allen, R E Kambic, S M Gatesy, J R Hutchinson
Human patellae (kneecaps) are thought to act as gears, altering the mechanical advantage of knee extensor muscles during running. Similar sesamoids have evolved in the knee extensor tendon independently in birds, but it is unknown if these also affect the mechanical advantage of knee extensors. Here, we examine the mechanics of the patellofemoral joint in the helmeted guineafowl Numida meleagris using a method based on muscle and tendon moment arms taken about the patella's rotation centre around the distal femur...
November 2017: Journal of Zoology: Proceedings of the Zoological Society of London
https://www.readbyqxmd.com/read/29195220/a-comprehensive-combined-experimental-and-computational-framework-for-pre-clinical-wear-simulation-of-total-knee-replacements
#10
A Abdelgaied, J Fisher, L M Jennings
A more robust pre-clinical wear simulation framework is required in order to simulate wider and higher ranges of activities, observed in different patient populations such as younger more active patients. Such a framework will help to understand and address the reported higher failure rates for younger and more active patients (National_Joint_Registry, 2016). The current study has developed and validated a comprehensive combined experimental and computational framework for pre-clinical wear simulation of total knee replacements (TKR)...
November 17, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29191076/customized-surface-guided-knee-implant-contact-analysis-and-experimental-test
#11
Ida Khosravipour, Shabnam Pejhan, Yunhua Luo, Urs P Wyss
Contact pressure and stresses on the articulating surface of the tibial component of a total knee replacement are directly related to the joint contact forces and the contact area. These stresses can result in wear and fatigue damage of the ultra-high-molecular-weight polyethylene. Therefore, conducting stress analysis on a newly designed surface-guided knee implant is necessary to evaluate the design with respect to the polyethylene wear. Finite element modeling is used to analyze the design's performance in level walking, stair ascending and squatting...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29188420/a-lateral-retinacular-release-during-total-knee-arthroplasty%C3%A2-changes-femorotibial-kinematics-an-in-vitro-study
#12
Arnd Steinbrück, Christian Schröder, Matthias Woiczinski, Alexander Glogaza, Peter E Müller, Volkmar Jansson, Andreas Fottner
INTRODUCTION: Lateral retinacular release (LRR) is a common procedure during total knee arthroplasty (TKA), especially if patellar maltracking is observed intraoperatively. The impact of LRR on patellofemoral kinematics is well-examined, but the influence on femorotibial kinematics requires more elucidation. Therefore, the aim of this study was to evaluate the effects of LRR on femorotibial kinematics in vitro. MATERIALS AND METHODS: A fixed bearing TKA was implanted in six human knee specimens...
November 29, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29188333/dynamically-tensioned-acl-functional-knee-braces-reduce-acl-and-meniscal-strain
#13
Sebastian Tomescu, Ryan Bakker, David Wasserstein, Mayank Kalra, Micah Nicholls, Cari Whyne, Naveen Chandrashekar
PURPOSE: The effectiveness of ACL functional knee braces to reduce meniscal and ACL strain after ACL injury or reconstruction is not well understood. A new dynamic knee tensioning brace system has been designed to apply an active stabilizing force to the knee. The ability of this system to reduce tissue strains is unknown. The purpose of this study was to test the ability of the dynamically tensioned brace to reduce strain in both the ACL and meniscus during rehabilitation activities...
November 29, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29185004/poor-knee-function-after-acl-reconstruction-is-associated-with-attenuated-landing-force-and-knee-flexion-moment-during-running
#14
Luke G Perraton, Michelle Hall, Ross A Clark, Kay M Crossley, Yong-Hao Pua, Tim S Whitehead, Hayden G Morris, Adam G Culvenor, Adam L Bryant
PURPOSE: Poor knee function after anterior cruciate ligament reconstruction (ACLR) may increase the risk of future knee symptoms and knee osteoarthritis via abnormal knee joint loading patterns, particularly during high-impact activity. This study aimed to assess the relationship between poor self-reported or clinically measured knee function and knee moments/vertical ground reaction force (vGRF) in individuals following ACLR. METHODS: 61 participants (mean 16.5 ± 3 months following ACLR, 23 women) completed a patient-reported knee function questionnaire and three hop tests (% of uninvolved limb)...
November 28, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29182569/knee-impedance-modulation-to-control-an-active-orthosis-using-insole-sensors
#15
Ana Cecilia Villa-Parra, Denis Delisle-Rodriguez, Jessica Souza Lima, Anselmo Frizera-Neto, Teodiano Bastos
Robotic devices for rehabilitation and gait assistance have greatly advanced with the objective of improving both the mobility and quality of life of people with motion impairments. To encourage active participation of the user, the use of admittance control strategy is one of the most appropriate approaches, which requires methods for online adjustment of impedance components. Such approach is cited by the literature as a challenge to guaranteeing a suitable dynamic performance. This work proposes a method for online knee impedance modulation, which generates variable gains through the gait cycle according to the users' anthropometric data and gait sub-phases recognized with footswitch signals...
November 28, 2017: Sensors
https://www.readbyqxmd.com/read/29181558/internal-external-malalignment-of-the-femoral-component-in-kinematically-aligned-total-knee-arthroplasty-increases-tibial-force-imbalance-but-does-not-change-laxities-of-the-tibiofemoral-joint
#16
Jeremy Riley, Joshua D Roth, Stephen M Howell, Maury L Hull
PURPOSE: The purposes of this study were to quantify the increase in tibial force imbalance (i.e. magnitude of difference between medial and lateral tibial forces) and changes in laxities caused by  2° and 4° of internal-external (I-E) malalignment of the femoral component in kinematically aligned total knee arthroplasty. Because I-E malalignment would introduce the greatest changes to the articular surfaces near 90° of flexion, the hypotheses were that the tibial force imbalance would be significantly increased near 90° flexion and that primarily varus-valgus laxity would be affected near 90° flexion...
November 27, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29181251/lower-extremity-kinematics-of-acl-repaired-and-non-injured-females-when-using-knee-savers%C3%A2
#17
Whitley J Stone, Scott W Arnett, Donald L Hoover
Background: Knee Savers® (KS) are an ergonomic aid purported to lessen the risk of injuries linked to deep squats. While widely used in sports such as baseball and softball, KS have not been tested to determine their effect upon lower extremity kinematics in any population. Purpose: The purpose of the study was to determine if KS influenced the lower extremity kinematics when females with previous anterior cruciate ligament (ACL)-reconstruction and healthy participants completed an end-range squat...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29179051/differences-in-pattern-of-variability-for-lower-extremity-kinematics-between-walking-and-running
#18
Amanda Estep, Steven Morrison, Shane Caswell, Jatin Ambegaonkar, Nelson Cortes
This study characterizes walking and running patterns in healthy individuals using linear and nonlinear methods Seventeen individuals (12 males, 5 females) volunteered for the study. 3D kinematic data during walking (WA) and running (RU) on a motorized treadmill were captured using reflective markers placed on lower body (200Hz). A single 25s trial (5000 data points) was collected for each gait task. WA speed was 1.39±0.12m/s, whereas RU speed was 2.56±0.27m/s. Variables of interest included ankle plantar/dorsi flexion, knee flexion/extension, knee abduction/adduction, hip flexion/extension, and hip abduction/adduction angles...
November 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29179043/the-effect-of-exercise-intensity-on-joint-power-and-dynamics-in-ergometer-double-poling-performed-by-cross-country-skiers
#19
Jørgen Danielsen, Øyvind Sandbakk, David McGhie, Gertjan Ettema
The purpose of this study was to examine the effect of increasing exercise intensity on the role of joint powers in ergometer double poling (DP), while taking specific dynamic constraints into account. One main question was whether lower-body power contribution increased or decreased with increasing intensity. Nine male Norwegian national-level cross-country skiers performed ergometer DP at low, moderate, high and maximal intensity. Kinematics, and ground (GRF) and poling (Fpoling) reaction forces were recorded and used in link segment modeling to obtain joint and whole-body dynamics...
November 23, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29175641/effect-of-tibia-marker-placement-on-knee-joint-kinematic-analysis
#20
Yuhui Wen, Hongshi Huang, Yuanyuan Yu, Si Zhang, Jie Yang, Yingfang Ao, Shihong Xia
Variability of kinematic measures determined by different marker sets among sites participating in a collaborative study is necessary for determining the reliability of a multi-site gait analysis research. We compared knee kinematics based on different marker sets on the tibia, calculating by segmental optimization (SO) and multi-body optimization (MBO) methods respectively, in order to assess the effect of marker locations on the methods. 11 healthy subjects participated in the study with 33 markers attached to the lower extremity segments, and 4 groups were identified according to markers on the tibia...
November 22, 2017: Gait & Posture
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