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Clinical Biomechanics

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https://www.readbyqxmd.com/read/28719806/effect-of-cage-design-supplemental-posterior-instrumentation-and-approach-on-primary-stability-of-a-lumbar-interbody-fusion-a-biomechanical-in-vitro-study
#1
Werner Schmoelz, Sabrina Sandriesser, Oded Loebl, Marlies Bauer, Dietmar Krappinger
BACKGROUND: There are various techniques and approaches for lumbar interbody fusion differing in access, cage type and type of supplemental posterior instrumentation. While a transforaminal access usually includes a hemifacetectomy, the facet joint can be preserved with a more lateral extraforaminal access. The supplemental posterior instrumentation required for both fusion techniques is still debated. The purpose of the present study was to compare primary stability of the two accesses for two different cage types with none, unilateral and bilateral supplemental posterior instrumentation...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28704694/harmony-as-a-convergence-attractor-that-minimizes-the-energy-expenditure-and-variability-in-physiological-gait-and-the-loss-of-harmony-in-cerebellar-ataxia
#2
Mariano Serrao, Giorgia Chini, Marco Iosa, Carlo Casali, Giovanni Morone, Carmela Conte, Fabiano Bini, Franco Marinozzi, Gianluca Coppola, Francesco Pierelli, Francesco Draicchio, Alberto Ranavolo
BACKGROUND: The harmony of the human gait was recently found to be related to the golden ratio value (ϕ). The ratio between the duration of the stance and that of the swing phases of a gait cycle was in fact found to be close to ϕ, which implies that, because of the fractal property of autosimilarity of that number, the gait ratios stride/stance, stance/swing, swing/double support, were not significantly different from one another. We studied a group of patients with cerebellar ataxia to investigate how the differences between their gait ratios and the golden ratio are related to efficiency and stability of their gait, assessed by energy expenditure and stride-to-stride variability, respectively...
July 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28708989/sex-specific-hip-osteoarthritis-associated-gait-abnormalities-alterations-in-dynamic-hip-abductor-function-differ-in-men-and-women
#3
Kharma C Foucher
BACKGROUND: Hip osteoarthritis results in abnormal gait mechanics, but it is not known whether abnormalities are the same in men and women. The hypothesis tested was that gait abnormalities are different in men and women with hip osteoarthritis vs. sex-specific asymptomatic groups. METHODS: 150 subjects with mild through severe radiographic hip osteoarthritis and 159 asymptomatic subjects were identified from an Institutional Review Board-approved motion analysis data repository...
July 4, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28668552/the-effect-of-an-8-week-stabilization-exercise-program-on-the-lumbopelvic-rhythm-and-flexion-relaxation-phenomenon
#4
Ali Shahvarpour, Sharon M Henry, Richard Preuss, Hakim Mecheri, Christian Larivière
BACKGROUND: Lumbar stabilization exercise programs should normalize the aberrant movements patterns often observed in patients with low back pain. This study aimed to determine the effect of an 8-week lumbar stabilization program on EMG/kinematics measures of the aberrant movement patterns in such patients. A secondary goal was to assess the 8-week test-retest reliability of these measures. METHODS: The patients followed an 8-week lumbar stabilization program while no intervention was carried out on the controls...
June 23, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28662423/biomechanical-research-on-contour-cage-with-transacetabular-screws-fixation-in-revision-total-hip-arthroplasty
#5
Haobo Wu, Chiyuan Ma, Jisheng Ran, Danfeng Xu, An Liu, Miao Sun, Lidong Wu, Shigui Yan
BACKGROUND: Use biomechanical technique to access the strain distribution and stability of Contour anti-protrusion cage with or without the whole circumference acetabular cup fixation by the transacetabular screws. METHODS: Pelvic specimens from 10 male cadavers were used for the biomechanical test. The models of type C bone defect were copied according to the AAOS classification. Group 1: the contour reconstruction ring was fixed only by flange screws; Group 2: the contour reconstruction ring was fixed both by flange screws and transacetabular screws in dome...
June 21, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28668553/the-recovery-response-to-a-novel-unannounced-laboratory-induced-slip-the-first-trial-effect-in-older-adults
#6
Xuan Liu, Sasha Reschechtko, Shuaijie Wang, Yi-Chung Clive Pai
BACKGROUND: After a single slip, older adults rapidly make adaptive changes to avoid or eliminate further backward loss of balance or a fall. This rapid adaptation has been termed the "single trial effect". The purpose of this study was to explore the relationship between the motor errors subjects experienced upon a novel slip and the selection and execution of corrective response by which they modified their ongoing gait pattern and turned it into a protective step. METHODS: A forward slip was induced in the laboratory among 145 community-living older (≥65year old) adults who were protected by an overhead full body harness system...
June 17, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28628801/evaluation-of-midcarpal-capitate-contact-mechanics-in-normal-injured-and-post-operative-wrists
#7
Saman Modaresi, Madhan S Kallem, Phil Lee, Terence E McIff, E Bruce Toby, Kenneth J Fischer
BACKGROUND: Scapholunate ligament injury is a commonly occurring carpal ligament injury. Pathology associated with scapholunate ligament injury depends on several factors such as the time after injury, type of injury (instability) and the development of osteoarthritis. The aim of this study was to investigate and compare contact mechanics in the lunocapitate and scaphocapitate joints in the normal, injured (scapholunate dissociation) and repaired (postoperative) wrist. METHODS: Four human subjects with scapholunate ligament dissociation participated in this study...
June 13, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28618311/predicting-knee-osteoarthritis-risk-in-injured-populations
#8
Michael J Long, Enrica Papi, Lynsey D Duffell, Alison H McGregor
BACKGROUND: Individuals who suffered a lower limb injury have an increased risk of developing knee osteoarthritis. Early diagnosis of osteoarthritis and the ability to track its progression is challenging. This study aimed to explore links between self-reported knee osteoarthritis outcome scores and biomechanical gait parameters, whether self-reported outcome scores could predict gait abnormalities characteristic of knee osteoarthritis in injured populations and, whether scores and biomechanical outcomes were related to osteoarthritis severity via Spearman's correlation coefficient...
June 12, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28628800/increased-internal-femoral-torsion-can-be-regarded-as-a-risk-factor-for-patellar-instability-a-biomechanical-study
#9
Peter Kaiser, Werner Schmoelz, Philip Schoettle, Marit Zwierzina, Christian Heinrichs, Rene Attal
BACKGROUND: Increased internal femoral torsion is regarded as a risk factor for patellar instability. Biomechanical investigations confirming this hypothesis are missing. METHODS: Eight fresh-frozen cadaver knees were tested on a specially designed simulator. Patellar motion and patellofemoral pressure were evaluated for 0°, 10°, and 20° of increased internal and external femoral torsion with native and with transected medial patellofemoral ligaments used to simulate patellar instability...
June 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28641199/influence-of-weight-bearing-visual-feedback-on-movement-symmetry-during-sit-to-stand-task
#10
Sumayeh Abujaber, Federico Pozzi, Joseph Zeni
BACKGROUND: Weight-bearing asymmetry is common in individuals with hip osteoarthritis and after total hip arthroplasty. Including symmetry training to the rehabilitation programs may normalize movement strategies during dynamic tasks. The purpose of this study was to evaluate the immediate influences of real-time visual feedback of weight distribution on the interlimb movement symmetry during the sit-to-stand task, before and after total hip arthroplasty, and to determine whether physical impairments affect the response to visual feedback...
June 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28618309/exertion-and-pain-do-not-alter-coordination-variability-in-runners-with-iliotibial-band-syndrome
#11
Jocelyn F Hafer, Allison M Brown, Katherine A Boyer
BACKGROUND: Iliotibial band syndrome is a common overuse running injury which results in altered mechanics. While injuries alter discrete mechanics, they may also cause a change in coordination variability, the stride-to-stride organization of runners' movement patterns. Uninjured and injured runners may experience a change in coordination variability during a run to exertion due to fatigue, pain, or a combination of these factors. The aim of the current study was to determine if runners with iliotibial band syndrome and uninjured runners display different segment coordination variability across the course of a run to exertion...
June 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28618310/bilateral-changes-in-3-d-scapular-kinematics-in-individuals-with-chronic-stroke
#12
Maíra Carolina Lixandrão, Paula Rezende Camargo, Caroline Evelin Neves Scarpa, Christiane Lanatovitz Prado-Medeiros, Tania Fátima Salvini
BACKGROUND: Stroke can lead to altered scapular motion that may limit the ability to perform activities of daily living. The aims were to evaluate scapular kinematics of individuals with chronic stroke and the correlation with paretic arm function. METHODS: Scapular kinematics was assessed in thirty-four individuals (Chronic stroke=17; controls=17) during arm elevation and lowering in scapular and self-selected planes, and during hair combing. The use of the paretic arm to perform activities of daily living was assessed by the Motor Activity Log (MAL-30)...
June 7, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28618308/supplementary-medial-locking-plate-fixation-of-ludloff-osteotomy-versus-sole-lag-screw-fixation-a-biomechanical-evaluation
#13
Panagiotis E Chatzistergos, George C Karaoglanis, Stavros K Kourkoulis, Minos Tyllianakis, Emmanouil D Stamatis
BACKGROUND: The Ludloff oblique osteotomy is inherently unstable, which might lead to delayed union and loss of correction. Supplementary fixation to two lag screw fixation has been proposed. The hypothesis is that the osteotomy fixation constructs supplemented by a mini locking plate provide greater resistance to osteotomy gaping and loss of angular correction in response to cyclic loading. METHODS: Twenty fourth generation composite 1st metatarsals were used and underwent a Ludloff osteotomy...
June 7, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28600995/high-spatial-resolution-pressure-distribution-of-the-vaginal-canal-in-pompoir-practitioners-a-biomechanical-approach-for-assessing-the-pelvic-floor
#14
Licia P Cacciari, Anice C Pássaro, Amanda C Amorim, Isabel C N Sacco
BACKGROUND: Pompoir is a technique poorly studied in the literature that claims to improve pelvic floor strength and coordination. This study aims to investigate the pelvic floor muscles' coordination throughout the vaginal canal among Pompoir practitioners and non-practitioners by describing a high resolution map of pressure distribution. METHODS: This cross-sectional, study included 40 healthy women in two groups: control and Pompoir. While these women performed both sustained and "waveform" pelvic floor muscle contractions, the spatiotemporal pressure distribution in their vaginal canals was evaluated by a non-deformable probe fully instrumented with a 10×10 matrix of capacitive transducers...
June 1, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28582642/movement-of-the-sacroiliac-joint-during-the-active-straight-leg-raise-test-in-patients-with-long-lasting-severe-sacroiliac-joint-pain
#15
Thomas J Kibsgård, Stephan M Röhrl, Olav Røise, Bengt Sturesson, Britt Stuge
BACKGROUND: The Active Straight Leg Raise is a functional test used in the assessment of pelvic girdle pain, and has shown to have good validity, reliability and responsiveness. The Active Straight Leg Raise is considered to examine the patients' ability to transfer load through the pelvis. It has been hypothesized that patients with pelvic girdle pain lack the ability to stabilize the pelvic girdle, probably due to instability or increased movement of the sacroiliac joint. This study examines the movement of the sacroiliac joints during the Active Straight Leg Raise in patients with pelvic girdle pain...
May 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28600994/differences-in-lumbar-spine-and-lower-extremity-kinematics-during-a-step-down-functional-task-in-people-with-and-people-without-low-back-pain
#16
Alejandra Hernandez, Karlie Gross, Sara Gombatto
BACKGROUND: When functional movements are impaired in people with low back pain, they may be a contributing factor to chronicity and recurrence. The purpose of the current study was to examine lumbar spine, pelvis, and lower extremity kinematics during a step down functional task between people with and without a history of low back pain. METHODS: A 3-dimensional motion capture system was used to analyze kinematics during a step down task. Total excursion of the lumbar spine, pelvis, and lower extremity segments in each plane were calculated from the start to end of the task...
May 27, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28600996/lower-limb-alignment-and-laxity-measures-before-during-and-after-total-knee-arthroplasty-a-prospective-cohort-study
#17
Jon V Clarke, Angela H Deakin, Frederic Picard, Philip E Riches
BACKGROUND: This study compared knee alignment and laxity in patients before, during and after total knee arthroplasty, using methodologically similar procedures, with an aim to help inform pre-operative planning. METHODS: Eighteen male and 13 female patients were recruited, mean age 66years (51-82) and mean body mass index of 33 (23-43). All were assessed pre- and postoperatively using a non-invasive infrared position capture system and all underwent total knee arthroplasty using a navigation system...
May 26, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28575704/muscle-function-in-women-with-systemic-sclerosis-association-with-fatigue-and-general-physical-function
#18
Amanda Cristina Justo, Fernando Silva Guimarães, Arthur Sá Ferreira, Mauricio Santos Soares, Priscila Santos Bunn, Agnaldo José Lopes
BACKGROUND: Individuals with systemic sclerosis have muscle functions with varying degrees of muscle weakness and atrophy, which in turn can have a negative impact on functional and health-related quality of life. This study aimed to evaluate peripheral muscle performance using isokinetic dynamometry of the knee in women with systemic sclerosis and to correlate peripheral muscle dysfunction with disability levels and general fatigue. METHODS: Twenty-six women with systemic sclerosis and a matched control group with an equal number of women underwent knee isokinetic dynamometry at angular speeds of 75°/s and 240°/s, isometric handgrip strength, the Health Assessment Questionnaire Disability Index, the Functional Assessment of Chronic Illness Therapy-Fatigue scale, and the Fatigue Impact Scale...
May 26, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28554052/acute-effects-of-spinal-bracing-on-scapular-kinematics-in-adolescent-idiopathic-scoliosis
#19
Gozde Gur, Elif Turgut, Cigdem Ayhan, Gul Baltaci, Yavuz Yakut
BACKGROUND: Bracing is the most common nonsurgical treatment for adolescent idiopathic scoliosis. Spinal braces affect glenohumeral and scapulothoracic motion because they restrict trunk movements. However, the potential spinal-bracing effects on scapular kinematics are unknown. The present study aimed to investigate the acute effects of spinal bracing on scapular kinematics in adolescent idiopathic scoliosis. METHODS: Scapular kinematics, including scapular internal/external rotation, posterior/anterior tilting, and downward/upward rotation during scapular plane elevation, were evaluated in 27 in-brace and out-of-brace adolescent idiopathic scoliosis patients with a three-dimensional electromagnetic tracking system...
May 22, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28554054/military-personnel-with-self-reported-ankle-injuries-do-not-demonstrate-deficits-in-dynamic-postural-stability-or-landing-kinematics
#20
Heather M Bansbach, Mita T Lovalekar, John P Abt, Deirdre Rafferty, Darcie Yount, Timothy C Sell
BACKGROUND: The odds of sustaining non-contact musculoskeletal injuries are higher in Special Operations Forces operators than in infantry soldiers. The ankle is one of the most commonly injured joints, and once injured can put individuals at risk for reinjury. The purpose of this study was to determine if any differences in postural stability and landing kinematics exist between operators with a self-reported ankle injury in the past one year and uninjured controls. METHODS: A total of 55 Special Operations Forces operators were included in this analysis...
May 19, 2017: Clinical Biomechanics
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