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https://www.readbyqxmd.com/read/29457707/peripheral-neurostimulation-breaks-the-shuffling-steps-patterns-in-parkinsonian-gait-a-double-blind-randomized-longitudinal-study-with-automated-mechanical-peripheral-stimulation
#1
Manuela Galli, Caterina Vicidomini, Ana F Rozin Kleiner, Laura Vacca, Veronica Cimolin, Claudia Condoluci, Fabrizio Stocchi, Maria F DE Pandis
BACKGROUND: The shuffling steps pattern is a typical feature of gait in patients affected by Parkinson's Disease (PD), which progressively reduces their quality of life, being related to the risk of falls in this population. Recently, Automated Mechanical Peripheral Stimulation (AMPS) was presented as an integrative rehabilitative treatment based on peripheral stimulation able to improve the gait spatiotemporal parameters in PD patients. AIM: To evaluate the effects of AMPS on shuffling steps pattern by analyzing the kinematic and spatio-temporal gait parameters...
February 19, 2018: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/29450566/unicompartmental-knee-arthroplasty-fails-to-completely-restore-normal-gait-patterns-during-level-walking
#2
Myung-Ku Kim, Jung-Ro Yoon, Se-Hyun Yang, Young-Soo Shin
PURPOSE: Gait analysis is a valuable instrument for measuring function objectively after unicompartmental knee arthroplasty (UKA). However, most gait analysis studies have reported conflicting results for functional assessment after UKA. This meta-analysis compared the gait patterns of UKA patients and healthy controls during level walking. METHODS: Studies were included in the meta-analysis if they recorded vertical ground reaction force (GRF), flexion at initial contact, flexion at loading response, extension at mid-stance, flexion at swing, walking speed, cadence, and stride length in UKA patients or healthy controls...
February 15, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29448160/multi-plane-multi-joint-lower-extremity-support-moments-during-a-rapid-deceleration-task-implications-for-knee-loading
#3
Jeffery T Podraza, Scott C White, Dan K Ramsey
The principle of lower limb support, and the contribution of hip, knee and ankle moments to an overall limb support strategy for an impact-like, rapid deceleration movement may help explain individual moment magnitude changes, thereby providing insight into how injury might occur or be avoided. Twenty subjects performed single limb, impact-like, deceleration landings at three different knee flexion angles in the range of 0-25, 25-50 and 50-75°. Kinematic and kinetic measures identified hip, knee and ankle moment contribution to limb support moments (LSMs) in three planes...
February 12, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29448081/medial-tilting-of-the-joint-line-in-posterior-stabilized-total-knee-arthroplasty-increases-contact-force-and-stress
#4
Yoshihisa Tanaka, Shinichiro Nakamura, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Moritoshi Furu, Mutsumi Watanabe, Shuichi Matsuda
BACKGROUND: Kinematically aligned total knee arthroplasty is based on the concept to represent the premorbid joint alignment with cruciate-retaining implants, characterized by medial tilt and internal rotation. However, kinematic and kinetic effects of kinematically aligned total knee arthroplasty with posterior-stabilized implants is unknown. The purpose of this study was to examine the effect of medial tilting of the joint line with posterior-stabilized implants. METHODS: A mechanical alignment model, and medial tilt 3° and 5° models were constructed...
February 9, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29447910/preventing-non-contact-acl-injuries-in-female-athletes-what-can-we-learn-from-dancers
#5
Catherine Turner, Sarah Crow, Thomas Crowther, Brittany Keating, Trenton Saupan, Jason Pyfer, Kimberly Vialpando, Szu-Ping Lee
OBJECTIVES: To investigate the effects of dance experience and movement instruction on lower extremity kinematics and muscle activation during a landing task. DESIGN: Cross-sectional case control. SETTING: Laboratory setting. PARTICIPANTS: 27 female subjects (age 18-25) in 2 groups: dancers (n = 12) and non-dancers (n = 15). MAIN OUTCOME MEASURES: Lower extremity biomechanics during drop landing were analyzed...
December 23, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29446974/error-reduction-in-the-finite-helical-axis-for-knee-kinematics
#6
Emily L Bishop, Jessica C Küpper, Ingrid R Fjeld, Gregor Kuntze, Janet L Ronsky
Traditionally the FHA is calculated stepwise between data points (sFHA), requiring down sampling to achieve a sufficiently large step size to minimize error. This paper proposes an alternate FHA calculation approach (rFHA), using a unique reference position to reduce error associated with small rotation angles. This study demonstrated error reduction using the rFHA approach relative to the sFHA approach. Furthermore, the rFHA in the femur is defined at each time point providing a continuous representation of joint motion...
February 15, 2018: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29444542/kinematically-aligned-total-knee-arthroplasty-or-mechanically-aligned-total-knee-arthroplasty
#7
Tsuneari Takahashi, Juned Ansari, Hemant G Pandit
Kinematically aligned total knee arthroplasty (KATKA) was developed to more anatomically align the knee prosthesis to restore the native alignment of the knee and promote physiological kinematics. Even though there are concerns with implant survival, and follow-up at 10 years or more after KATKA has not been reported, there is a negligible incidence of failure of a tibial component at 2 to 9 years. Early clinical results with this technique are encouraging and demonstrate better functional outcomes compared with mechanically aligned TKA (MATKA)...
February 14, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29443845/raising-the-joint-line-in-tka-is-associated-with-mid-flexion-laxity-a-study-in-cadaver-knees
#8
Thomas Luyckx, Hilde Vandenneucker, Lennart Scheys Ing, Evie Vereecke, Arnout Victor Ing, Jan Victor
BACKGROUND: In a typical osteoarthritic knee with varus deformity, distal femoral resection based off the worn medial femoral condyle may result in an elevated joint line. In a setting of fixed flexion contracture, the surgeon may choose to resect additional distal femur to obtain extension, thus purposefully raising the joint line. However, the biomechanical effect of raising the joint line is not well recognized. QUESTIONS/PURPOSES: (1) What is the effect of the level of the medial joint line (restored versus raised) on coronal plane stability of a TKA? (2) Does coronal alignment technique (mechanical axis versus kinematic technique) affect coronal plane stability of the knee? (3) Can the effect of medial joint-line elevation on coronal plane laxity be predicted by an analytical model? METHODS: A TKA prosthesis was implanted in 10 fresh frozen nonarthritic cadaveric knees with restoration of the medial joint line at its original level (TKA0)...
March 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29436742/biomechanical-influence-of-deficient-posterolateral-corner-structures-on-knee-joint-kinematics-a-computational-study
#9
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Moonki Jung, Sangyun Oh, Sung-Jae Kim, Sung-Hwan Kim
The posterolateral corner (PLC) structures including the popliteofibular ligament (PFL), popliteus tendon (PT) and lateral collateral ligament (LCL) are important soft tissues for posterior translational, external rotational and varus angulation knee joint instabilities. The purpose of this study was to determine the effects of deficient PLC structures on the kinematics of the knee joint under gait and squat loading conditions. We developed subject-specific computational models with full 12-degree-of-freedom tibiofemoral and patellofemoral joints for four male subjects and one female subject...
February 13, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29432721/vastus-lateralis-motor-unit-firing-rate-is-higher-in-females-with-patellofemoral-pain
#10
Alessio Gallina, Michael A Hunt, Paul Hodges, S Jayne Garland
OBJECTIVE: To compare neural drive, determined from motor unit firing rate, to the vastus medialis and lateralis in females with and without patellofemoral pain. DESIGN: Cross-sectional study. SETTING: University research laboratory. PARTICIPANTS: Females (N=56) 19-35 years old, 36 with patellofemoral pain and 20 controls. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE(S): Participants sustained an isometric knee extension contraction at 10% of their maximal voluntary effort for 70s...
February 9, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29430489/posterior-cruciate-ligament-current-concepts-review
#11
REVIEW
Santiago Pache, Zachary S Aman, Mitchell Kennedy, Gilberto Yoshinobu Nakama, Gilbert Moatshe, Connor Ziegler, Robert F LaPrade
The posterior cruciate ligament (PCL) is the largest and strongest ligament in the human knee, and the primary posterior stabilizer. Recent anatomy and biomechanical studies have provided an improved understanding of PCL function. PCL injuries are typically combined with other ligamentous, meniscal and chondral injuries. Stress radiography has become an important and validated objective measure in surgical decision making and post-operative assessment. Isolated grade I or II PCL injuries can usually be treated non-operatively...
January 2018: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/29427858/spatiotemporal-and-kinematic-characteristics-of-gait-initiation-across-a-wide-speed-range
#12
Ben Stansfield, Katrina Hawkins, Sarah Adams, Doireann Church
BACKGROUND: Gait initiation can be performed at a range of speeds. Those with disability tend to use a slower speed compared to those without disability. In assessing the spatiotemporal and kinematic characteristics of gait initiation it is therefore important to consider the effects of speed on outcomes. RESEARCH QUESTION: What is the effect of speed of performance on spatiotemporal and kinematic characteristics of gait initiation? METHODS: Spatiotemporal and kinematic characteristics were measured across a wide range of speeds from very slow to very fast (normalised initiating leg (swing or SW limb) step speed 0...
February 5, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29426012/mri-ute-t2-profile-characteristics-correlate-to-walking-mechanics-and-patient-reported-outcomes-2-years-after-acl-reconstruction
#13
Ashley A Williams, Matthew R Titchenal, Thomas P Andriacchi, Constance R Chu
OBJECTIVE: Quantitative 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 analyses is a useful clinical metric for assessing cartilage matrix degeneration. This work tests the hypotheses that UTE-T2* depthwise rates of change (profile slopes) correlated with clinical outcome metrics of walking mechanics and patient reported outcomes (PRO) in patients 2 years after ACLR...
February 6, 2018: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29425835/the-influence-of-internal-and-external-tibial-rotation-offsets-on-knee-joint-and-ligament-biomechanics-during-simulated-athletic-tasks
#14
Nathaniel A Bates, Rebecca J Nesbitt, Jason T Shearn, Gregory D Myer, Timothy E Hewett
BACKGROUND: Following anterior cruciate ligament injury and subsequent reconstruction transverse plane tibiofemoral rotation becomes underconstrained and overconstrained, respectively. Conflicting reports exist on how rotations influence loading at the knee. This investigation aimed to determine the mechanical effects of internal and external tibial rotation offsets on knee kinematics and ligament strains during in vitro simulations of in vivo recorded kinematics. METHOD: A 6-degree-of-freedom robotic manipulator arm was used to articulate 11 cadaveric tibiofemoral joint specimens through simulations of four athletic tasks produced from in vivo recorded kinematics...
February 2, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29413796/varus-thrust-visualized-during-gait-was-associated-with-inverted-foot-in-patients-with-knee-osteoarthritis-an-exploratory-study
#15
Hiroshi Ohi, Hirotaka Iijima, Naoto Fukutani, Tomoki Aoyama, Eishi Kaneda, Kazuko Ohi, Hiromu Ito, Shuichi Matsuda, Abe Kaoru
The foot is speculated to play a role in knee joint kinematics. This exploratory cross-sectional study examined the association between static foot posture and the presence of varus thrust visualized during gait in patients with medial knee osteoarthritis (OA). Patients (n = 88 patients and 134 knees; age, 61-91 years; 68.2% female) with Kellgren/Lawrence (K/L) grade ≥1 in the medial compartment were included in this study and underwent gait observation for varus thrust. These patients' three-dimensional static foot posture while standing was evaluated and their tibiofemoral joint K/L grades and anatomical axis angles were also assessed as covariates...
January 29, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29413794/gait-adaptations-of-older-adults-on-an-uneven-brick-surface-can-be-predicted-by-age-related-physiological-changes-in-strength
#16
P C Dixon, K H Schütte, B Vanwanseele, J V Jacobs, J T Dennerlein, J M Schiffman
BACKGROUND: Outdoor falls in community-dwelling older adults are often triggered by uneven pedestrian walkways. It remains unclear how older adults adapt to uneven surfaces typically encountered in the outdoor built-environment and whether these adaptations are associated to age-related physiological changes. RESEARCH QUESTION: The aims of this study were to (1) compare gait parameters over uneven and flat brick walkways, (2) evaluate the differences between older and young adults for these two surfaces, and (3) assess if physiological characteristics could predict adaptations in older adults...
January 29, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29413788/biomechanical-characteristics-of-lower-limb-gait-waveforms-associations-with-body-fat-in-children
#17
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
https://www.readbyqxmd.com/read/29413784/relationship-between-gait-parameters-and-mr-imaging-in-idiopathic-normal-pressure-hydrocephalus-patients-after-shunt-surgery
#18
Ippei Kitade, Ryuhei Kitai, Hiroyuki Neishi, Ken-Ichiro Kikuta, Seiichiro Shimada, Akihiko Matsumine
BACKGROUND: A few previous studies have reported a change in gait motion in idiopathic normal pressure hydrocephalus (iNPH) patients after shunt surgery compared with before shunt surgery; however, there has been no detailed quantitative investigation of gait, including kinetic and kinematic parameters. Furthermore, the relationship between gait parameters and magnetic resonance (MR) imaging has not been confirmed. RESEARCH QUESTION: We investigated the gait motion in patients with iNPH, and evaluated the relationship between kinetic gait parameters and MR imaging before and after shunt surgery...
January 12, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29413451/muscle-activity-and-kinetics-of-lower-limbs-during-walking-in-pronated-feet-individuals-with-and-without-low-back-pain
#19
Nader Farahpour, AmirAli Jafarnezhadgero, Paul Allard, Mahdi Majlesi
The objectives of this study were to investigate whether excessive feet pronation alters the joints' kinematics, kinetics and the activity of involved muscles during gait in low back pain patients. METHODS: The lower limb joints' motion, moment and power, as well as the activity of involved muscles during walking were measured in a control group, and two experimental groups including a group with excessive feet pronation only, and another group of low back pain patients with excessive feet pronation...
January 30, 2018: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29411900/in-vivo-comparison-of-medialized-dome-and-anatomic-patellofemoral-geometries-using-subject-specific-computational-modeling
#20
Azhar A Ali, Erin M Mannen, Paul J Rullkoetter, Kevin B Shelburne
Successful outcome following total knee arthroplasty (TKA) with patella resurfacing is partly determined by the restoration of patellofemoral (PF) function and recovery of the quadriceps mechanism. The current study compared two patellar TKA geometries (medialized dome and anatomic) to determine their impact on PF mechanics and quadriceps function. In-vivo, subject-specific patellar mechanics were evaluated using a sequential experimental and modeling approach. First, stereo radiography, marker-based motion capture, and force plate data were collected for TKA patients (10 dome, 10 anatomic) performing a knee extension and lunge...
February 7, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
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