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Clinical Biomechanics

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https://www.readbyqxmd.com/read/28528237/skin-deformation-during-shoulder-movements-and-upper-extremity-activities
#1
Weiqing Ge, Alison Sfara, Brittany Hians
BACKGROUND: The necessity of sternal precautions for patients following cardiac surgery with median sternotomy has been questioned by clinicians, researchers, and even patients. The primary purpose was to determine if sternal skin deformation during shoulder movements and upper extremity activities is compressive or distractive and if there are any significant differences between the skin deformation at different positions during shoulder movements and upper extremity activities. The secondary purpose was to determine if sternal skin deformation is correlated with scapular stabilizer muscle strength...
May 12, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28528238/effects-of-grab-bar-on-utilized-friction-and-dynamic-stability-when-elderly-people-enter-the-bathtub
#2
Yusuke Sekiguchi, Tomohisa Kato, Keita Honda, Hiroyasu Kanetaka, Shin-Ichi Izumi
BACKGROUND: The effect of the grab bar on dynamic stability when elderly people enter the bathtub remains unclear. The purpose of the present study is to examine the age-related effect of the grab bar on dynamic stability during lateral stepping over an obstacle when entering bathtub. METHODS: Sixteen young, healthy adults and sixteen elderly adults participated. The subjects performed lateral stepping over an obstacle with and without vertical and horizontal bars...
May 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28514698/clinical-outcomes-and-frontal-plane-two-dimensional-biomechanics-during-the-30-second-single-leg-stance-test-in-patients-before-and-after-hip-abductor-tendon-reconstructive-surgery
#3
Rose E Huxtable, Timothy R Ackland, Gregory C Janes, Jay R Ebert
BACKGROUND: Hip abductor tendon tears are a common cause of Greater Trochanteric Pain Syndrome. Conservative treatments are often ineffective and surgical reconstruction may be recommended. This study investigated the improvement in clinical outcomes and frontal plane two-dimensional biomechanics during a 30-second single leg stance test, in patients undergoing reconstruction. We hypothesized that clinical scores and pertinent biomechanical variables would significantly improve post-surgery, and these outcomes would be significantly correlated...
May 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28511104/lumbar-extensor-muscle-force-control-is-associated-with-disability-in-people-with-chronic-low-back-pain
#4
Adrian Pranata, Luke Perraton, Doa El-Ansary, Ross Clark, Karine Fortin, Tim Dettmann, Adam Bryant
BACKGROUND: The ability to control lumbar extensor force output is necessary for daily activities. However, it is unknown whether this ability is impaired in chronic low back pain patients. Similarly, it is unknown whether lumbar extensor force control is related to the disability levels of chronic low back pain patients. METHODS: Thirty-three chronic low back pain and 20 healthy people performed lumbar extension force-matching task where they increased and decreased their force output to match a variable target force within 20%-50% maximal voluntary isometric contraction...
May 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28501788/dynamic-femoral-head-translations-in-dysplastic-hips
#5
Tatsuya Sato, Hiromasa Tanino, Yasuhiro Nishida, Hiroshi Ito, Takeo Matsuno, Scott A Banks
BACKGROUND: Developmental dysplasia of the hip is an important disease leading to osteoarthritis. Recently, researchers have focused on hip instability as a potentially important dynamic factor for osteoarthritis, but the detailed kinematics of dysplastic hips during weight-bearing gait have not been reported. The purpose of this research is to contrast femoral translation in contralateral healthy hips and dysplastic hips during weight-bearing stepping. METHODS: Twelve dysplastic hips and eight healthy hips were investigated...
May 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28500909/development-and-testing-of-a-moment-based-coactivation-index-to-assess-complex-dynamic-tasks-for-the-lumbar-spine
#6
Peter Le, Alexander Aurand, Jonathan S Dufour, Gregory G Knapik, Thomas M Best, Safdar N Khan, Ehud Mendel, William S Marras
BACKGROUND: Many methods exist to describe coactivation between muscles. However, most methods have limited capability in the assessment of coactivation during complex dynamic tasks for multi-muscle systems such as the lumbar spine. The ability to assess coactivation is important for the understanding of neuromuscular inefficiency. In the context of this manuscript, inefficiency is defined as the effort or level of coactivation beyond what may be necessary to accomplish a task (e.g., muscle guarding during postural stabilization)...
May 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28500910/ankle-strength-impairments-associated-with-knee-osteoarthritis
#7
Glaucia Helena Gonçalves, Francisco Alburquerque Sendín, Paula Regina Mendes da Silva Serrão, Luiz Fernando Approbato Selistre, Marina Petrella, Cristiano Carvalho, Stela Márcia Mattiello
BACKGROUND: Knee Osteoarthritis seems to negatively impact ankle biomechanics. However, the effect of knee osteoarthritis on ankle muscle strength has not been clearly established. This study aimed to evaluate the ankle strength of the plantar flexors and dorsiflexors of patients with knee osteoarthritis in different degrees of severity. METHODS: Thirty-seven patients with knee osteoarthritis and 15 controls, subjected to clinical and radiographic analysis, were divided into three groups: control, mild, and moderate knee osteoarthritis...
May 4, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28511105/quadriceps-rate-of-torque-development-and-disability-in-individuals-with-anterior-cruciate-ligament-reconstruction
#8
Hope C Davis, J Troy Blackburn, Eric D Ryan, Brittney A Luc-Harkey, Matthew S Harkey, Darin A Padua, Brian Pietrosimone
BACKGROUND: The purpose of this study was to determine associations between self-reported function (International Knee Documentation Committee Index), isometric quadriceps strength and rate of torque development in individuals with a unilateral anterior cruciate ligament reconstruction. METHODS: Forty-one individuals [31% male, BMI mean 25 (SD 4) kg/m(2), months post anterior cruciate ligament reconstruction mean 49 (SD 40)] completed the self-reported function and isometric quadriceps function testing...
April 28, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28472739/inter-joint-coordination-analysis-of-reach-to-grasp-kinematics-in-children-and-adolescents-with-obstetrical-brachial-plexus-palsy
#9
Christian H Mayfield, Sahana N Kukke, Sylvain Brochard, Christopher J Stanley, Katharine E Alter, Diane L Damiano
BACKGROUND: Obstetrical brachial plexus palsy is a common birth injury to nerves passing through the brachial plexus that may result in structural and functional abnormalities. Individual joint trajectories from kinematic analyses have been used to evaluate the source and extent of abnormalities. Here, two summary measures of limb kinematics were utilized: 1) the Arm Profile Score summarizing upper limb joint kinematic abnormalities from a typical pattern across a task, and 2) the recently developed Multi-joint Coordination Measure using principal component analysis to characterize typical coordination of multiple joints throughout a task and compute deviations in time and space...
April 25, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28463696/spinal-fusion-without-instrumentation-experimental-animal-study
#10
Sandra Reitmaier, Julian Schuelke, Hendrik Schmidt, David Volkheimer, Anita Ignatius, Hans-Joachim Wilke
BACKGROUND: The number and cost of instrumented spinal fusion surgeries have increased rapidly, primarily for the treatment of lumbar segmental instabilities. However, what if the organism itself is able to restore segmental stability over time? This large-animal study using sheep aimed to investigate whether the reparative response after destabilization via facetectomy and nucleotomy without instrumentation can effectively fuse the spinal segment comparable to instrumented standard fusion surgery...
April 25, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28463695/influence-of-the-compliance-of-a-patient-s-body-on-the-head-taper-fixation-strength-of-modular-hip-implants
#11
Annika Krull, Nicholas E Bishop, Niels M Steffen, Frank Lampe, Klaus Püschel, Michael M Morlock
BACKGROUND: The strength of the modular fixation between head and stem taper of total hip replacement implants should be sufficient to minimise relative motion and prevent corrosion at the interface. Intraoperatively the components are assembled by impaction with a hammer. It is unclear whether the effective compliance of the patient's body modifies the strength of the taper interface under impaction assembly. The purpose of this study was to assess the influence of the compliance of the patient's body on the taper fixation strength...
April 25, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28477525/the-effect-of-a-rotator-cuff-tear-and-its-size-on-three-dimensional-shoulder-motion
#12
Arjen Kolk, Jan Ferdinand Henseler, Pieter Bas de Witte, Erik W van Zwet, Peer van der Zwaal, Cornelis P J Visser, Jochem Nagels, Rob G H H Nelissen, Jurriaan H de Groot
BACKGROUND: Rotator cuff-disease is associated with changes in kinematics, but the effect of a rotator cuff-tear and its size on shoulder kinematics is still unknown in-vivo. METHODS: In this cross-sectional study, glenohumeral and scapulothoracic kinematics of the affected shoulder were evaluated using electromagnetic motion analysis in 109 patients with 1) subacromial pain syndrome (n=34), 2) an isolated supraspinatus tear (n=21), and 3) a massive rotator cuff tear involving the supraspinatus and infraspinatus (n=54)...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28460254/foot-segmental-motion-and-coupling-in-stage-ii-and-iii-tibialis-posterior-tendon-dysfunction
#13
Maarten Van de Velde, Giovanni Arnoldo Matricali, Sander Wuite, Charlotte Roels, Filip Staes, Kevin Deschamps
BACKGROUND: Classification systems developed in the field of posterior tibialis tendon dysfunction omit to include dynamic measurements. Since this may negatively affect the selection of the most appropriate treatment modality, studies on foot kinematics are highly recommended. Previous research characterised the foot kinematics in patients with posterior tibialis tendon dysfunction. However, none of the studies analysed foot segmental motion synchrony during stance phase, nor compared the kinematic behaviour of the foot in presence of different posterior tibialis tendon dysfunction stages...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28458187/torsional-stiffness-after-subtalar-arthrodesis-using-second-generation-headless-compression-screws-biomechanical-comparison-of-2-screw-and-3-screw-fixation
#14
Markus Riedl, Richard R Glisson, Takumi Matsumoto, Stefan G Hofstaetter, Mark E Easley
BACKGROUND: Subtalar joint arthrodesis is a common operative treatment for symptomatic subtalar arthrosis. Because excessive relative motion between the talus and calcaneus can delay or prohibit fusion, fixation should be optimized, particularly in patients at risk for subtalar arthrodesis nonunion. Tapered, fully-threaded, variable pitch screws are gaining popularity for this application, but the mechanical properties of joints fixed with these screws have not been characterized completely...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28458186/dual-belt-treadmill-familiarization-implications-for-knee-function-in-moderate-knee-osteoarthritis-compared-to-asymptomatic-controls
#15
Derek Rutherford, Matthew Baker, Ivan Wong, William Stanish
BACKGROUND: Effect of treadmill familiarization on knee function in osteoarthritis is not clear. Purpose was to determine whether spatiotemporal characteristics, knee joint biomechanics and muscle activation patterns change as individuals with and without medial compartment knee osteoarthritis familiarize to dual-belt treadmill walking over 6min. METHODS: 20 individuals with knee osteoarthritis and 20 asymptomatic controls walked at a self-selected speed. Spatiotemporal characteristics, sagittal plane joint motions, sagittal and frontal plane moments and knee joint muscle activation patterns, amplitude normalized to maximum isometric contractions were analyzed...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28437676/superior-inferior-position-of-patellar-component-affects-patellofemoral-kinematics-and-contact-forces-in-computer-simulation
#16
Shinichiro Nakamura, Yoshihisa Tanaka, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Moritoshi Furu, Shuichi Matsuda
BACKGROUND: Anterior knee pain has been reported as a major postoperative complication after total knee arthroplasty, which may lead to patient dissatisfaction. Rotational alignment and the medial-lateral position correlate with patellar maltracking, which can cause knee pain postoperatively. However, the superior-inferior position of the patellar component has not been investigated. The purpose of the current study was to investigate the effects of the patellar superior-inferior position on patellofemoral kinematics and kinetics...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28432901/neuromuscular-rate-of-force-development-deficit-in-parkinson-disease
#17
Kelley G Hammond, Ronald F Pfeiffer, Mark S LeDoux, Brian K Schilling
BACKGROUND: Bradykinesia and reduced neuromuscular force exist in Parkinson disease. The interpolated twitch technique has been used to evaluate central versus peripheral manifestations of neuromuscular strength in healthy, aging, and athletic populations, as well as moderate to advanced Parkinson disease, but this method has not been used in mild Parkinson disease. This study aimed to evaluate quadriceps femoris rate of force development and quantify potential central and peripheral activation deficits in individuals with Parkinson disease...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28431220/contribution-of-ankle-foot-orthosis-moment-in-regulating-ankle-and-knee-motions-during-gait-in-individuals-post-stroke
#18
Toshiki Kobayashi, Michael S Orendurff, Madeline L Singer, Fan Gao, K Bo Foreman
BACKGROUND: Ankle-foot orthosis moment resisting plantarflexion has systematic effects on ankle and knee joint motion in individuals post-stroke. However, it is not known how much ankle-foot orthosis moment is generated to regulate their motion. The aim of this study was to quantify the contribution of an articulated ankle-foot orthosis moment to regulate ankle and knee joint motion during gait in individuals post-stroke. METHODS: Gait data were collected from 10 individuals post-stroke using a Bertec split-belt instrumented treadmill and a Vicon 3-dimensional motion analysis system...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28390935/evaluation-of-clinical-gait-analysis-parameters-in-patients-affected-by-multiple-sclerosis-analysis-of-kinematics
#19
Giacomo Severini, Mario Manca, Giovanni Ferraresi, Luisa Maria Caniatti, Michela Cosma, Francesco Baldasso, Sofia Straudi, Monica Morelli, Nino Basaglia
BACKGROUND: Clinical Gait Analysis is commonly used to evaluate specific gait characteristics of patients affected by Multiple Sclerosis. The aim of this report is to present a retrospective cross-sectional analysis of the changes in Clinical Gait Analysis parameters in patients affected by Multiple Sclerosis. METHODS: In this study a sample of 51 patients with different levels of disability (Expanded Disability Status Scale 2-6.5) was analyzed. We extracted a set of 52 parameters from the Clinical Gait Analysis of each patient and used statistical analysis and linear regression to assess differences among several groups of subjects stratified according to the Expanded Disability Status Scale and 6-Minutes Walking Test...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28384527/anterolateral-ligament-reconstruction-with-autologous-grafting-a-biomechanical-study
#20
E Monaco, R M Lanzetti, M Fabbri, A Redler, A De Carli, A Ferretti
BACKGROUND: To evaluate the reliability of the Iliotibial band compared to gracilis tendon as a graft to be used in anterolateral ligament reconstruction. METHODS: Gracilis tendon and a strip of Iliotibial band compared were harvested from 8 fresh human cadaveric knees. The gracilis tendon was prepared to obtain a graft of 10cm in length (Group 1). Iliotibial band compared was prepared to obtain a graft of 10cm in length and 0.5cm in width from the middle portion (Group 2)...
May 2017: Clinical Biomechanics
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