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Knee biomechanics

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https://www.readbyqxmd.com/read/28924748/a-multi-joint-model-of-quiet-upright-stance-accounts-for-the-uncontrolled-manifold-structure-of-joint-variance
#1
Hendrik Reimann, Gregor Schöner
The upright body in quiet stance is usually modeled as a single-link inverted pendulum. This agrees with most of the relevant sensory organs being at the far end of the pendulum, i.e., the eyes and the vestibular system in the head. Movement of the body in quiet stance has often been explained in terms of the "ankle strategy," where most movement is generated by the ankle musculature, while more proximal muscle groups are only rarely activated for faster movements or in response to perturbations, for instance, by flexing at the hips in what has been called the "hip strategy...
September 18, 2017: Biological Cybernetics
https://www.readbyqxmd.com/read/28920556/the-effects-of-limb-dominance-and-a-short-term-high-intensity-exercise-protocol-on-both-landings-of-the-vertical-drop-jump-implications-for-the-vertical-drop-jump-as-a-screening-tool
#2
Enda F Whyte, Patrick Kennelly, Oliver Milton, Chris Richter, Siobhán O'Connor, Kieran A Moran
The effectiveness of vertical drop jumps (VDJs) to screen for non-contact ACL injuries is unclear. This may be contributed to by discrete point analysis, which does not evaluate patterns of movement. Also, limited research exists on the second landing of VDJs, potential lower limb performance asymmetries and the effect of fatigue. Statistical parametric mapping investigated the main effects of landing, limb dominance and a high intensity, intermittent exercise protocol (HIIP) on VDJ biomechanics. Twenty-two male athletes (21...
September 18, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28915105/variations-of-ankle-foot-orthosis-constrained-movements-increase-ankle-range-of-movement-while-maintaining-power-output-of-recumbent-cycling
#3
Puteri N F Hamdan, Nur Azah Hamzaid, Juliana Usman, Md Anamul Islam, Victor S P Kean, Ahmad K Abdul Wahab, Nazirah Hasnan, Glen M Davis
Previous research investigated recumbent cycle power output (PO) from the perspective of knee and hip joint biomechanics. However, ankle-foot biomechanics and, in particular, the effect of ankle-foot orthosis (AFO)-constrained movements on cycle PO has not been widely explored. Therefore, the purpose of this study was to determine whether AFOs of a fixed position (FP) and in dorsi-plantarflexion (DPF)-, dorsiflexion (DF)- and plantarflexion (PF)-constrained movements might influence PO during voluntary recumbent cycling exercises...
September 15, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28914209/knee-ligament-injury-and-the-clinical-application-of-tissue-engineering-techniques-a-systematic-review
#4
Thomas Riley, Reza Mafi, Pouya Mafi, Wasim Khan
Background The incidence of knee ligament injury is increasing and represents a significant cost to healthcare providers. Current interventions include tissue grafts, suture repair and non-surgical management. These techniques have demonstrated good patient outcomes but have been associated graft rejection, infection, long term immobilization and reduced joint function. The limitations of traditional management strategies have prompted research into tissue engineering of knee ligaments. Objective This paper aims to evaluate whether tissue engineering of knee ligaments offers a viable alternative in the clinical management of knee ligament injuries...
September 15, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28913685/-ramp-lesions-tips-and-tricks-in-diagnostics-and-therapy
#5
REVIEW
R Seil, A Hoffmann, S Scheffler, D Theisen, C Mouton, D Pape
There is an increasing biomechanical and anatomical understanding of the different types of meniscal lesions. Lesions of the posterior part of the medial meniscus in the meniscosynovial area have recently received increased attention. They generally occur in association with anterior cruciate ligament (ACL) injuries. They are often missed ("hidden lesions") due to the fact that they cannot be seen by routine anterior arthroscopic inspection. Furthermore, meniscosynovial lesions play a role in anteroposterior knee laxity and, as such, they may be a cause of failure of ACL reconstruction or of postoperative persistent laxity...
September 14, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28910722/analysis-of-in-vivo-articular-cartilage-contact-surface-of-the-knee-during-a-step-up-motion
#6
Peng Yin, Jing-Sheng Li, Willem A Kernkamp, Tsung-Yuan Tsai, Seung-Hoon Baek, Ali Hosseini, Lin Lin, Peifu Tang, Guoan Li
BACKGROUND: Numerous studies have reported on the tibiofemoral articular cartilage contact kinematics, however, no data has been reported on the articular cartilage geometry at the contact area. This study investigated the in-vivo tibiofemoral articular cartilage contact biomechanics during a dynamic step-up motion. METHODS: Ten healthy subjects were imaged using a validated magnetic resonance and dual fluoroscopic imaging technique during a step-up motion. Three-dimensional bone and cartilage models were constructed from the magnetic resonance images...
September 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28900569/there-are-no-biomechanical-differences-between-runners-classified-by-the-functional-movement-screen
#7
Rodrigo Ribeiro de Oliveira, Shalimá Figueirêdo Chaves, Yuri Lopes Lima, Márcio Almeida Bezerra, Gabriel Peixoto Leão Almeida, Pedro Olavo de Paula Lima
BACKGROUND: Running has been one of the main choices of physical activity in people seeking an active lifestyle. The Functional Movement Screen (FMS™) is a screening tool that aims to discern movement competency. PURPOSE: The purposes of this study were to compare biomechanical characteristics between two groups rated using the composite FMS™ score, and to analyze the influence of specific individual tests. The hypothesis was that the group that scored above 14 would demonstrate better performance on biomechanical tests than the group that scored below 14...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900562/a-biomechanical-comparison-among-three-kinds-of-rebound-type-jumps-in-female-collegiate-athletes
#8
Miki Nariai, Naruto Yoshida, Atsushi Imai, Kazumichi Ae, Ryo Ogaki, Hirokazu Suhara, Hitoshi Shiraki
BACKGROUND: Single-legged drop jumps (SDJ), single-legged repetitive jumps (SRJ), and single-legged side hops (SSH) are often used as plyometric training and functional performance tests. Differences in the kinetics and kinematic characteristics of lower extremity joints during these jumps are unclear. HYPOTHESIS/PURPOSE: The purpose of this study was to investigate the joint motion and mechanical work of the takeoff leg from foot contact to foot-off during SDJ, SRJ, and SSH in the sagittal and frontal planes in female athletes...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900561/effects-of-a-band-loop-on-lower-extremity-muscle-activity-and-kinematics-during-the-barbell-squat
#9
Ryan C A Foley, Brittany D Bulbrook, Duane C Button, Michael W R Holmes
BACKGROUND: Medial knee collapse can signal an underlying movement issue that, if uncorrected, can lead to a variety of knee injuries. Placing a band around the distal thigh may act as a proprioceptive aid to minimize medial collapse of the knee during squats; however, little is known about EMG and biomechanics in trained and untrained individuals during the squat with an elastic band added. HYPOTHESIS/PURPOSE: To investigate the effects of the TheraBand® Band Loop on kinematics and muscle activity of the lower extremity during a standard barbell back squat at different intensities in both trained and untrained individuals...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28899825/long-term-performance-and-user-satisfaction-with-implanted-neuroprostheses-for-upright-mobility-after-paraplegia-two-to-14-year-follow-up
#10
Ronald J Triolo, Stephanie Nogan Bailey, Kevin M Foglyano, Rudi Kobetic, Lisa M Lombardo, Michael E Miller, Gilles Pinault
OBJECTIVE: To quantify the long-term (LT) (>2 years) effects of lower extremity (LE) neuroprostheses (NPs) for standing, transfers, stepping and seated stability after spinal cord injury. DESIGN: Single-subject design case series with participants acting as their own concurrent controls, including retrospective data review. SETTING: Hospital-based clinical biomechanics laboratory with experienced (>20 years in the field) research biomedical engineers, physical therapist and medical monitoring review...
September 9, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28899558/arthroscopically-measured-syndesmotic-stability-after-screw-vs-suture-button-fixation-in-a-cadaveric-model
#11
Bart Lubberts, Bryan G Vopat, Jonathon C Wolf, Umile Giuseppe Longo, Christopher W DiGiovanni, Daniel Guss
BACKGROUND: Appropriate management of ankle syndesmotic instability is needed to prevent the development of complications. Previous biomechanical studies have evaluated movement of the fibula after screw or suture button fixations with different results, most likely being caused by variations in experimental setups that did not mirror the in vivo clinical setting. This study aimed to arthroscopically compare in a cadaveric model the stability of syndesmotic fixation with either a suture button or syndesmotic screw...
August 31, 2017: Injury
https://www.readbyqxmd.com/read/28898105/gait-characteristics-associated-with-a-greater-increase-in-medial-knee-cartilage-t1%C3%AF-and-t2-relaxation-times-in-patients-undergoing-anterior-cruciate-ligament-reconstruction
#12
Hsiang-Ling Teng, Daniel Wu, Favian Su, Valentina Pedoia, Richard B Souza, C Benjamin Ma, Xiaojuan Li
BACKGROUND: Osteoarthritis of the medial tibiofemoral joint (MTFJ) is prevalent among patients undergoing anterior cruciate ligament reconstruction (ACLR). Magnetic resonance T1ρ and T2 relaxation times provide noninvasive methods to quantify early cartilage degeneration. Altered sagittal-plane gait biomechanics have been observed after ACLR, but their associations with longitudinal changes in MTFJ cartilage T1ρ and T2 remain unclear. Hypothesis/Purpose: To examine whether the peak knee flexion moment (KFM), knee flexion angle (KFA), and vertical ground-reaction force (vGRF) during gait are associated with prospective changes in medial tibiofemoral cartilage T1ρ and T2 in ACL-reconstructed knees and to compare these gait characteristics between patients undergoing ACLR and healthy control participants...
September 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895760/application-of-a-semi-automatic-cartilage-segmentation-method-for-biomechanical-modeling-of-the-knee-joint
#13
Mimmi K Liukkonen, Mika E Mononen, Petri Tanska, Simo Saarakkala, Miika T Nieminen, Rami K Korhonen
Manual segmentation of articular cartilage from knee joint 3D magnetic resonance images (MRI) is a time consuming and laborious task. Thus, automatic methods are needed for faster and reproducible segmentations. In the present study, we developed a semi-automatic segmentation method based on radial intensity profiles to generate 3D geometries of knee joint cartilage which were then used in computational biomechanical models of the knee joint. Six healthy volunteers were imaged with a 3T MRI device and their knee cartilages were segmented both manually and semi-automatically...
September 12, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28892671/kinematic-and-kinetic-gait-deviations-in-males-long-after-anterior-cruciate-ligament-reconstruction
#14
Giovanni Milandri, Mike Posthumus, T J Small, Adam Bothma, Willem van der Merwe, Reshma Kassanjee, Sudesh Sivarasu
BACKGROUND: Biomechanical deviations long (approx. 5years) after anterior cruciate ligament reconstruction have not been quantified in males, despite their distinct risk profile as compared to females. These deviations can indicate altered joint loading during chronic, repetitive motions. METHODS: Cross-sectional study, comparing kinematic and kinetic variables between 15 male anterior cruciate ligament reconstructed patients and 15 healthy controls. During walking and running gait, measurements were taken of impact dynamics, knee and hip sagittal plane angles and moments, and knee varus angles and adduction moments...
July 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28892670/the-influence-of-sex-and-obesity-on-gait-biomechanics-in-people-with-severe-knee-osteoarthritis-scheduled-for-arthroplasty
#15
K L Paterson, L Sosdian, R S Hinman, T V Wrigley, J Kasza, M Dowsey, P Choong, K L Bennell
BACKGROUND: Sex and body mass may influence knee biomechanics associated with poor total knee arthroplasty (TKA) outcomes for knee osteoarthritis (OA). This study aimed to determine if gait differed between men and women, and overweight and class I obese patients with severe knee OA awaiting TKA. METHODS: 34 patients with severe knee OA (average age 70.0 (SD 7.2) years, body mass index 30.3 (4.1kg/m(2))) were recruited from a TKA waiting list. Three-dimensional gait analysis was performed at self-selected walking speed...
September 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28888904/changes-in-biomechanical-risk-factors-for-knee-osteoarthritis-and-their-association-with-5-year-clinically-important-improvement-after-limb-realignment-surgery
#16
Trevor B Birmingham, Rebecca Moyer, Kristyn Leitch, Bert Chesworth, Dianne Bryant, Kevin Willits, Robert Litchfield, Peter J Fowler, J Robert Giffin
OBJECTIVE: To evaluate 5-year outcomes after lower limb realignment and test the hypothesis that surgery-induced changes in selected biomechanical risk factors for medial knee OA are associated with clinically important improvements. DESIGN: We prospectively evaluated patient-reported outcomes, full-limb standing radiographs and gait biomechanics before, 6 months (surgery-induced change) and 5 years after medial opening wedge high tibial osteotomy (HTO) in 170 patients (46...
September 6, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28888229/changes-in-ankle-joint-motion-after-supramalleolar-osteotomy-a-cadaveric-model
#17
Hak Jun Kim, Eui Dong Yeo, Im Joo Rhyu, Soon-Hyuck Lee, Yeon Soo Lee, Young Koo Lee
BACKGROUND: Malalignment of the ankle joint has been found after trauma, by neurological disorders, genetic predisposition and other unidentified factors, and results in asymmetrical joint loading. For a medial open wedge supramalleolar osteotomy(SMO), there are some debates as to whether concurrent fibular osteotomy should be performed. We assessed the changes in motion of ankle joint and plantar pressure after supramalleolar osteotomy without fibular osteotomy. METHODS: Ten lower leg specimens below the knee were prepared from fresh-frozen human cadavers...
September 9, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28888109/biomechanical-compensations-of-the-trunk-and-lower-extremities-during-stepping-tasks-after-unilateral-transtibial-amputation
#18
Amanda M Murray, Brecca M Gaffney, Bradley S Davidson, Cory L Christiansen
BACKGROUND: Lower extremity movement compensations following transtibial amputation are well-documented and are likely influenced by trunk posture and movement. However, the biomechanical compensations of the trunk and lower extremities, especially during high-demand tasks such as step ascent and descent, remain unclear. METHODS: Kinematic and kinetic data were collected during step ascent and descent tasks for three groups of individuals: diabetic/transtibial amputation, diabetic, and healthy...
August 30, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28886100/biomechanical-evaluation-of-tibial-bone-adaptation-after-revision-total-knee-arthroplasty-a-comparison-of-different-implant-systems
#19
María Paz Quilez, Belen Seral, María Angeles Pérez
The best methods to manage tibial bone defects following total knee arthroplasty remain under debate. Different fixation systems exist to help surgeons reconstruct knee osseous bone loss (such as tantalum cones, cement, modular metal augments, autografts, allografts and porous metaphyseal sleeves) However, the effects of the various solutions on the long-term outcome remain unknown. In the present work, a bone remodeling mathematical model was used to predict bone remodeling after total knee arthroplasty (TKA) revision...
2017: PloS One
https://www.readbyqxmd.com/read/28884352/risk-factors-for-knee-injury-in-golf-a-systematic-review
#20
REVIEW
Matthew L Baker, Devakar R Epari, Silvio Lorenzetti, Mark Sayers, Urs Boutellier, William R Taylor
BACKGROUND: Golf is commonly considered a low-impact sport that carries little risk of injury to the knee and is generally allowed following total knee arthroplasty (TKA). Kinematic and kinetic studies of the golf swing have reported results relevant to the knee, but consensus as to the loads experienced during a swing and how the biomechanics of an individual's technique may expose the knee to risk of injury is lacking. OBJECTIVES: Our objective was to establish (1) the prevalence of knee injury resulting from participation in golf and (2) the risk factors for knee injury from a biomechanical perspective, based on an improved understanding of the internal loading conditions and kinematics that occur in the knee from the time of addressing the ball to the end of the follow-through...
September 7, 2017: Sports Medicine
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