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https://www.readbyqxmd.com/read/29933346/gait-biomechanics-in-acl-reconstructed-knees-at-different-time-frames-post-surgery
#1
John Goetschius, Jay Hertel, Susan Saliba, Stephen F Brockmeier, Joseph M Hart
PURPOSE: To examine knee and hip biomechanics during walking and jogging in groups of ACLR patients at early, mid, and late time frames post-surgery and healthy controls. METHODS: Participants included individuals with a history of primary, unilateral ACLR, stratified into Early (1.4±0.4 years post, n=18), Mid (3.3±0.6 years post, n=20), and Late (8.5±2.8 years post, n=20) ACLR groups based on time post-surgery, and a healthy control group (n=20). Walking and jogging motion capture analysis of knee and hip kinetics and kinematics were measured in the sagittal and frontal planes...
June 21, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29933185/association-between-kinesiophobia-and-walking-gait-characteristics-in-physically-active-individuals-with-anterior-cruciate-ligament-reconstruction
#2
Brittney A Luc-Harkey, Jason R Franz, Elena Losina, Brian Pietrosimone
BACKGROUND: Individuals with anterior cruciate ligament reconstruction (ACLR) demonstrate persistent alterations in walking gait characteristics that contribute to poor long-term outcomes. Higher kinesiophobia, or fear of movement/re-injury, may result in the avoidance of movements that increase loading on the ACLR limb. RESEARCH QUESTION: Determine the association between kinesiophobia and walking gait characteristics in physically active individuals with ACLR...
June 18, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29933182/healthy-3d-knee-kinematics-during-gait-differences-between-women-and-men-and-correlation-with-x-ray-alignment
#3
Julien Clément, Panagiota Toliopoulos, Nicola Hagemeister, François Desmeules, Alexandre Fuentes, Pascal-André Vendittoli
BACKGROUND: Normal 3D knee kinematics during gait is still not well understood, especially regarding differences between women and men. RESEARCH QUESTION: The objective of the present study was to characterize 3D knee kinematics during gait in healthy women and men with a validated tool. METHODS: Knee kinematics was analysed with the KneeKG™ system in 90 healthy subjects (49 females and 41 males). 3D knee rotations were compared between women and men, and between right and left knees...
June 11, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29932758/effect-of-different-placement-of-heel-rockers-on-lower-limb-joint-biomechanics-in-healthy-individuals
#4
Maedeh Farzadi, Zahra Safaeepour, Hoda Nabavi, Masumeh Bagherzadeh Cham, Mohammad Ebrahim Mousavi
BACKGROUND: Rocker shoes are commonly prescribed to healthy and pathologic populations to decrease stress on the lower limbs. An optimal rocker shoe design must consider both toe and heel rockers. Heel rockers are as effective as toe rockers in relieving foot plantar pressures. However, most studies have focused on the position of toe rockers. The aim of this study was to assess the effect of different heel rocker apex placements on lower-limb kinetics and kinematics. METHODS: Eighteen healthy females participated in this study...
May 2018: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/29929162/in-vivo-validation-of-patellofemoral-kinematics-during-overground-gait-and-stair-ascent
#5
Samuel Pitcairn, Bryson Lesniak, William Anderst
BACKGROUND: The patellofemoral (PF) joint is a common site for non-specific anterior knee pain. The pathophysiology of patellofemoral pain may be related to abnormal motion of the patella relative to the femur, leading to increased stress at the patellofemoral joint. Patellofemoral motion cannot be accurately measured using conventional motion capture. RESEARCH QUESTION: The aim of this study was to determine the accuracy of a biplane radiography system for measuring in vivo PF motion during walking and stair ascent...
June 18, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29925106/the-effect-of-increasing-jump-steps-on-stance-leg-joint-kinetics-in-bounding
#6
Yasushi Kariyama, Hiroaki Hobara, Koji Zushi
Jump distance per step in bounding exercises from the standing position increases with increasing number of steps. We examined the hypothesis that the joint kinetic variables of the stance leg would also increase accordingly. Eleven male athletes (sprinters and jumpers) performed bounding exercise, starting from the double-leg standing posture, and covered the longest distance possible by performing a series of seven forward alternating single-leg jumps. Kinematic and kinetic data were calculated using the data by a motion capture system and force platforms...
June 20, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29914742/individuals-with-chronic-ankle-instability-exhibit-dynamic-postural-stability-deficits-and-altered-unilateral-landing-biomechanics-a-systematic-review
#7
REVIEW
Jeffrey D Simpson, Ethan M Stewart, David M Macias, Harish Chander, Adam C Knight
OBJECTIVE: To evaluate the literature regarding unilateral landing biomechanics and dynamic postural stability in individuals with and without chronic ankle instability (CAI). METHODS: Four online databases (PubMed, ScienceDirect, Scopus, and SportDiscus) were searched from the earliest records to 31 January 2018, as well as reference sections of related journal articles, to complete the systematic search. Studies investigating the influence of CAI on unilateral landing biomechanics and dynamic postural stability were systematically reviewed and evaluated...
June 13, 2018: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29913354/benefits-of-an-increased-prosthetic-ankle-range-of-motion-for-individuals-with-a-trans-tibial-amputation-walking-with-a-new-prosthetic-foot
#8
Daniel W W Heitzmann, Firooz Salami, Alan R De Asha, Julia Block, Cornelia Putz, Sebastian I Wolf, Merkur Alimusaj
BACKGROUND: Individuals with trans-tibial amputation show a greater peak prosthetic ankle power (push- off) when using energy storing and returning (ESAR) prosthetic feet as compared to solid-ankle cushion-heel feet. ESAR feet further contribute to the users' body support and thus limit prosthetic ankle motion. To improve ankle motion, articulating prosthetic feet have been introduced. However, articulating feet may diminish push-off. RESEARCH QUESTION: Does a novel prosthetic foot, with a serial layout of carbon fibre leaf springs, connected by a multi-centre joint construction, have advantages in kinematics and kinetics over a conventional ESAR prosthetic foot?> METHODS: Eleven individuals with unilateral trans-tibial amputation were fitted with the novel foot (NF) and a conventional ESAR Foot (CF) and underwent 3D gait analysis...
June 11, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29912857/stretch-could-reduce-hamstring-injury-risk-during-sprinting-by-right-shifting-the-length-torque-curve
#9
Mianfang Ruan, Li Li, Chen Chen, Xie Wu
Ruan, M, Li, L, Chen, C, and Wu, X. Stretch could reduce hamstring injury risk during sprinting by right shifting the length-torque curve. J Strength Cond Res XX(X): 000-000, 2018-It was hypothesized that static stretch would shift the length-torque curve to the right, which may reduce the risk of muscle strain injuries. The purpose of this study was to evaluate the acute effects of static stretching of hamstring (SSH) on the risk of hamstring injury during sprinting indicated by the shift of the length-torque relationship...
June 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29912071/influence-of-sex-on-current-methods-of-adjusting-saddle-height-in-indoor-cycling
#10
Alberto Encarnación-Martínez, Ventura Ferrer-Roca, Juan García-López
Encarnación-Martínez, A, Ferrer-Roca, V, and García-López, J. Influence of sex on current methods of adjusting saddle height in indoor cycling. J Strength Cond Res XX(X): 000-000, 2018-The popularity of indoor cycling has increased in fitness centers, and therefore, proper bike fitting is important to avoid biomechanical-related injuries. However, no previous studies have compared the biomechanical kinematics of various existing protocols of saddle-height adjustment in indoor cycling. Furthermore, it was not clear if these protocols were appropriate for both men and women, as these equations were primarily obtained in male cyclists...
June 14, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29910710/supplemental-stimulation-improves-swing-phase-kinematics-during-exoskeleton-assisted-gait-of-sci-subjects-with-severe-muscle-spasticity
#11
Andrew Ekelem, Michael Goldfarb
Spasticity is a common comorbidity associated with spinal cord injury (SCI). Robotic exoskeletons have recently emerged to facilitate legged mobility in people with motor complete SCI. Involuntary muscle activity attributed to spasticity, however, can prevent such individuals from using an exoskeleton. Specifically, although most exoskeleton technologies can accommodate low to moderate spasticity, the presence of moderate to severe spasticity can significantly impair gait kinematics when using an exoskeleton...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29910355/knee-angle-and-stride-length-in-association-with-ball-speed-in-youth-baseball-pitchers
#12
Bart van Trigt, Wouter Schallig, Erik van der Graaff, Marco J M Hoozemans, Dirkjan Veeger
The purpose of this study was to determine whether stride length and knee angle of the leading leg at foot contact, at the instant of maximal external rotation of the shoulder, and at ball release are associated with ball speed in elite youth baseball pitchers. In this study, fifty-two elite youth baseball pitchers (mean age 15.2 SD (standard deviation) 1.7 years) pitched ten fastballs. Data were collected with three high-speed video cameras at a frequency of 240 Hz. Stride length and knee angle of the leading leg were calculated at foot contact, maximal external rotation, and ball release...
May 29, 2018: Sports
https://www.readbyqxmd.com/read/29910152/biomechanical-correlates-of-running-performance-in-active-children
#13
Sian Williams, Kevin Netto, Renee Kennedy, Jarrad Turner-Bryndzej, Ryan Campbell, Simon M Rosalie
OBJECTIVES: Examine the running kinematics in healthy, physically active prepubescent children and to determine if specific biomechanical factors correlate with running performance. DESIGN: Cross-sectional study. METHODS: Fifteen children (age 9years, ±11months) completed a 1km time trial before undergoing three-dimensional running motion analysis. RESULTS: A strong positive correlation was observed between the biomechanical variables of stride length (p<...
June 4, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29902834/-current-knee-arthroplasty-designs-and-kinematics-differences-in-radii-conformity-and-pivoting
#14
Tilman Calliess, Peter Savov, Max Ettinger, Roman Karkosch
Today, there is an almost endless variety of knee prosthesis models on the market from which the surgeon can choose. Although the designs appear closer and closer to one another, the industry makes a great effort to emphasise different features as beneficial and a stand-alone. It is increasingly difficult to keep an overview and to assess the clinical relevance of the diverse features. There is a clear lack of independent comparative studies and evidence is low. Nevertheless, different design philosophies require special surgical techniques, so that the surgeon must be familiar with the peculiarity of his/her prosthesis...
June 14, 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29902807/a-biomechanical-comparison-of-single-leg-landing-and-unplanned-sidestepping
#15
Chamnan Chinnasee, Gillian Weir, Siriporn Sasimontonkul, Jacqueline Alderson, Cyril Donnelly
Unplanned sidestepping and single-leg landing have both been used to screen athletes for injury risk in sport. The aim of this study was to directly compare the lower limb mechanics of three single-leg landing tasks and an unplanned sidestepping task. Thirteen elite female team sport athletes completed a series of non-contact single-leg drop landings, single-leg countermovement jumps, single-leg jump landings and unplanned sidestepping in a randomized counterbalanced design. Three dimensional kinematics (250 Hz) and ground reaction force (2,000 Hz) data with a participant specific lower limb skeletal model were used to calculate and compare hip, knee and ankle joint kinematics, peak joint moments, instantaneous joint power and joint work during the weight acceptance phase of each sporting task (α=0...
June 14, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29896561/short-term-safety-and-effectiveness-of-a-second-generation-motion-guided-total-knee-system
#16
Adam I Harris, Tianyi David Luo, Jason E Lang, Branko Kopjar
Background: Modern knee prostheses are designed to more closely replicate normal knee kinematics. The JOURNEY II Bi-Cruciate Stabilized Total Knee System (Smith & Nephew Inc., Memphis, TN) is a second-generation motion-guided knee system that demonstrates axial rotation patterns during flexion, which resemble those of the normal knee. The aim of this study was to assess the short-term safety and effectiveness of this system in standard clinical practice. Methods: A total of 186 subjects (209 primary total knee arthroplasties [TKAs]) were enrolled at 12 U...
June 2018: Arthroplasty Today
https://www.readbyqxmd.com/read/29895307/kinematic-adaptions-to-induced-short-term-pelvic-limb-lameness-in-trotting-dogs
#17
Birte Goldner, Stefanie Fischer, Ingo Nolte, Nadja Schilling
BACKGROUND: Lameness due to paw injuries is common in the clinical practice. Although many studies investigated gait adaptations to diseases or injuries, mainly of the hip and knee, our understanding of the biomechanical coping mechanisms that lame dogs utilize is limited. Therefore, this study evaluated the kinematic changes associated with an induced, load-bearing pelvic limb lameness in healthy dogs trotting on a treadmill. Kinematic analysis included spatio-temporal comparisons of limb, joint and segment angles of all limbs...
June 13, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29895235/reliability-and-validity-of-frontal-plane-kinematics-of-the-trunk-and-lower-extremity-measured-with-two-dimensional-cameras-during-athletic-tasks-a-systematic-review-with-meta-analysis
#18
Thiago Jambo Alves Lopes, Deisi Ferrari, Joshua Ioannidis, Milena Simic, Fábio Mícolis de Azevedo, Evangelos Pappas
Study Design Systematic review with meta-analysis. Background Two-dimensional (2D) analysis is commonly used to quantify frontal plane kinematics of the trunk and lower extremity; however, there are conflicting results regarding the reliability and validity of these measurements. Objective To synthesize the current literature to determine if 2D analysis is a reliable and valid method of measuring frontal plane kinematics of the trunk and lower extremity during squatting, landing and cutting tasks. Methods MEDLINE, CINAHL, EMBASE, Scopus and SportDISCUS databases were searched from inception until March 2017...
June 12, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29894977/evolution-of-gait-in-adolescents-and-young-adults-with-spastic-diplegia-after-selective-dorsal-rhizotomy-in-childhood-a-10-year-follow-up-study
#19
Marianna Romei, Laura M Oudenhoven, Petra E M van Schie, Willem J R van Ouwerkerk, Marjolein M van der Krogt, Annemieke I Buizer
BACKGROUND: Short-term benefit on gait of selective dorsal rhizotomy (SDR) surgery, which relieves spasticity of the lower extremities has been demonstrated in children with cerebral palsy (CP). However very little is known of the evolution of gait when patients become adolescents and young adults. RESEARCH QUESTION: How does the gait pattern evolve in adolescents and young adults who underwent SDR during childhood? METHODS: A longitudinal study was performed including 19 ambulant patients with spastic diplegia due to CP or other causes (mean age at SDR: 6...
June 4, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29890932/biomechanical-analysis-of-walking-gait-when-simulating-the-use-of-an-ilizarov-external-fixator
#20
Robin B Layton, Todd D Stewart, Paul Harwood, Neil Messenger
The Ilizarov frame is an external fixation device, primarily used for the treatment of complex fractures. The authors postulate that the size and weight of the frame may lead to biomechanical adaptations to gait, independent to any injury. Temporospatial characteristics, kinetics and kinematics were assessed when simulating the use of an Ilizarov frame. Fifteen healthy participants performed walking trials, with and without the simulated frame. Significant changes to temporospatial characteristics were identified, with a decreased mean walking speed (with: 1...
June 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
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