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Kinematic alignment

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https://www.readbyqxmd.com/read/29780617/patellar-tracking-in-primary-total-knee-arthroplasty
#1
Simon Donell
This is a review of the recent literature of the various factors that affect patellar tracking following total knee arthroplasty (TKA).Patellar tracking principally depends on the pre-existing patellar tracking and the rotational alignment of the femoral and tibial implants, but the detailed movements depend on the patellar shape. The latter means that the patellar kinematics of any implanted TKA does not return to normal.Laboratory cadaveric studies use normal knees and non-activity-based testing conditions and so may not translate into clinical findings...
April 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29769833/effects-of-knee-alignments-and-toe-clip-on-frontal-plane-knee-biomechanics-in-cycling
#2
Guangping Shen, Songning Zhang, Hunter J Bennett, James C Martin, Scott E Crouter, Eugene C Fitzhugh
Effects of knee alignment on the internal knee abduction moment (KAM) in walking have been widely studied. The KAM is closely associated with the development of medial knee osteoarthritis. Despite the importance of knee alignment, no studies have explored its effects on knee frontal plane biomechanics during stationary cycling. The purpose of this study was to examine the effects of knee alignment and use of a toe clip on the knee frontal plane biomechanics during stationary cycling. A total of 32 participants (11 varus, 11 neutral, and 10 valgus alignment) performed five trials in each of six cycling conditions: pedaling at 80 rpm and 0...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29763812/computation-of-hip-rotation-kinematics-retrospectively-using-functional-knee-calibration-during-gait
#3
Morgan Sangeux
BACKGROUND: Hip rotation kinematics during gait is a key parameter to support clinical decision making, for example in children with lower limb torsional deformities. However, hip rotation kinematics is also one of the least repeatable parameter because it is difficult to locate the position of the medio-lateral axis of the femur. Functional knee calibration provides an alternative to locate the medio-lateral axis of the femur and may be performed retrospectively, using the movement of the knee joint during gait...
May 8, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29762541/biomechanical-gait-variable-estimation-using-wearable-sensors-after-unilateral-total-knee-arthroplasty
#4
Ik-Hyun Youn, Jong-Hoon Youn, Joseph A Zeni, Brian A Knarr
Total knee arthroplasty is a common surgical treatment for end-stage osteoarthritis of the knee. The majority of existing studies that have explored the relationship between recovery and gait biomechanics have been conducted in laboratory settings. However, seamless gait parameter monitoring in real-world conditions may provide a better understanding of recovery post-surgery. The purpose of this study was to estimate kinematic and kinetic gait variables using two ankle-worn wearable sensors in individuals after unilateral total knee arthroplasty...
May 15, 2018: Sensors
https://www.readbyqxmd.com/read/29756441/multi-responsive-kinematics-and-robotics-of-surface-patterned-polymer-film
#5
Shumin Liang, Xiaxin Qiu, Jun Yuan, Wei Huang, Xuemin Du, Lidong Zhang
Soft robots, sensors and energy harvesters require materials that are capable of converting external stimuli to visible deformations, and especially shape-programmable deformations are desired. Herein, we develop a polymer film that can reversibly respond to humidity, heating and acetone vapors with generation of shape-programmable large deformations. Polyvinylidene fluoride (PVDF) film, capable of providing acetone responsiveness, is designed with microchannel patterns on one side by using templates, and the microchannels-patterned side is then treated with hygroscopic 3-aminopropyltriethoxysilane (APTES) to give humidity/heating-responsive elements...
May 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29746965/spine-and-lower-extremity-kinematics-during-gait-in-cervical-spondylotic-myelopathy-patients
#6
Ram Haddas, Sujal Patel, Raj Arakal, Akwasi Boah, Theodore Belanger, Kevin L Ju
BACKGROUND CONTEXT: CSM typically manifests with a slow, progressive stepwise decline in neurologic function, including hand clumsiness and balance difficulties. Gait disturbances are frequently seen in CSM patients, with more advanced cases exhibiting a stiff, spastic gait. PURPOSE: To evaluate the spatiotemporal parameters and spine and lower extremity kinematics during the gait cycle of adult cervical spondylotic myelopathy (CSM) patients prior to surgical intervention...
May 7, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29745752/predicting-volleyball-serve-reception-at-group-level
#7
Ana Paulo, Frank T J M Zaal, Ludovic Seifert, Sofia Fonseca, Duarte Araújo
In a group-serve-reception task, how does serve-reception become effective? We addressed "who" receives/passes the ball, what task-related variables predict action mode selection and whether the action mode selected was associated with reception efficacy. In 182 serve-receptions we tracked the ball and the receivers' heads with two video-cameras to generate 3D world-coordinates reconstructions. We defined receivers' reception-areas based on Voronoi diagrams (VD). Our analyses of the data showed that this approach was accurate in describing "who" receives the serve in 95...
May 10, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29739631/morphological-patterns-of-anterior-femoral-condylar-resection-in-kinematically-and-mechanically-aligned-total-knee-arthroplasty
#8
Jung-Taek Kim, Jun Han, Quan Hu Shen, Sung Won Moon, Ye-Yeon Won
BACKGROUND: "Grand-piano sign" has been used as a popular benchmark to facilitate correct rotational alignment during total knee arthroplasty (TKA). The purpose was to quantitatively determine morphological patterns on anterior femoral resection in mechanically aligned (MA) and kinematically aligned (KA) TKA. METHODS: Computed tomography scans of 60 TKA candidates were reconstructed into 3D models. Femurs were virtually cut with a 3D imaging program using various anterior flange flexion angles (AFFAs) of 3°, 5°, and 7°...
April 9, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29725764/a-preliminary-videofluoroscopic-investigation-of-swallowing-physiology-and-function-in-individuals-with-oculopharyngeal-muscular-dystrophy-opmd
#9
Ashley A Waito, Catriona M Steele, Melanie Peladeau-Pigeon, Angela Genge, Zohar Argov
Dysphagia is one of the primary symptoms experienced by individuals with Oculopharyngeal Muscular Dystrophy (OPMD). However, we lack understanding of the discrete changes in swallowing physiology that are seen in OPMD, and the resulting relationship to impairments of swallowing safety and efficiency. This study sought to describe the pathophysiology of dysphagia in a small sample of patients with OPMD using a videofluoroscopy examination (VFSS) involving 3 × 5 mL boluses of thin liquid barium (22% w/v)...
May 3, 2018: Dysphagia
https://www.readbyqxmd.com/read/29657851/kinematic-alignment-technique-for-total-hip-and-knee-arthroplasty-the-personalized-implant-positioning-surgery
#10
Charles Rivière, Stefan Lazic, Loïc Villet, Yann Wiart, Sarah Muirhead Allwood, Justin Cobb
Conventional techniques for hip and knee arthroplasty have led to good long-term clinical outcomes, but complications remain despite better surgical precision and improvements in implant design and quality.Technological improvements and a better understanding of joint kinematics have facilitated the progression to 'personalized' implant positioning (kinematic alignment) for total hip (THA) and knee (TKA) arthroplasty, the true value of which remains to be determined.By achieving a true knee resurfacing, the kinematic alignment (KA) technique for TKA aims at aligning the components with the physiological kinematic axes of the knee and restoring the constitutional tibio-femoral joint line frontal and axial orientation and soft-tissue laxity...
March 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29657844/spine-hip-relations-in-patients-with-hip-osteoarthritis
#11
Charles Rivière, Stefan Lazic, Louis Dagneaux, Catherine Van Der Straeten, Justin Cobb, Sarah Muirhead-Allwood
Patients with hip osteoarthritis often have an abnormal spine-hip relation (SHR), meaning the presence of a clinically deleterious spine-hip and/or hip-spine syndrome.Definition of the individual SHR is ideally done using the EOS® imaging system or, if not available, with conventional lumbopelvic lateral radiographs.By pre-operatively screening patients with abnormal SHR, it is possible to refine total hip replacement (THR) surgical planning, which may improve outcomes.An important component of the concept of kinematically aligned total hip arthroplasty (KA THA) consists of defining the optimal acetabular cup design and orientation based on the assessment of an individual's SHR, and use of the transverse acetabular ligament to adjust the cup positioning...
February 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29657839/current-concepts-for-aligning-knee-implants-patient-specific-or-systematic
#12
REVIEW
Charles Rivière, Stefan Lazic, Oliver Boughton, Yann Wiart, Loic Vïllet, Justin Cobb
Mechanical or anatomical alignment techniques create a supposedly 'biomechanically friendly' but often functionally limited prosthetic knee.Alternative techniques for alignment in total knee arthroplasty (TKA) aim at being more anatomical and patient-specific, aiming to improve functional outcomes after TKA.The kinematic alignment (KA) technique for TKA has shown good early clinical outcomes. Its role in extreme anatomical variation remains to be defined.The restricted KA technique for TKA might be a reasonable option for patients with extreme anatomical variation...
January 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29651903/the-kinetics-of-swinging-a-baseball-bat
#13
Joseph J Crisco, Nikolas J Osvalds, Michael J Rainbow
The purpose of this study was to compute the three-dimensional kinetics required to swing three youth baseball bats of varying moments of inertia (MOI). 306 swings by 22 male players (13-18 yrs.) were analyzed. Inverse dynamics with respect to the batter's hands were computed given the known kinematics and physical properties of the bats. We found that peak force increased with larger bat MOI and was strongly correlated with bat tip speed. In contrast, peak moments were weakly correlated with bat MOI and bat tip speed...
April 13, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29651897/the-effect-of-uphill-and-downhill-slopes-on-weight-transfer-alignment-and-shot-outcome-in-golf
#14
Glen M Blenkinsop, Ying Liang, Nicholas J Gallimore, Michael J Hiley
The aim of the study was to examine changes in weight transfer, alignment and shot outcome during golf shots from flat, uphill, and downhill slopes. Twelve elite male golfers hit 30 shots with a six-iron from a computer assisted rehabilitation environment (CAREN) used to create 5° slopes while collecting 3D kinematics and kinetics of the swing. A launch monitor measured performance outcomes. A shift in the centre of pressure was found throughout the swing when performed on a slope, with the mean position moving approximately 9% closer to the lower foot...
April 13, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29643592/does-trampoline-or-hard-surface-jumping-influence-lower-extremity-alignment
#15
Kiyokazu Akasaka, Akihiro Tamura, Aoi Katsuta, Ayako Sagawa, Takahiro Otsudo, Yu Okubo, Yutaka Sawada, Toby Hall
[Purpose] To determine whether repetitive trampoline or hard surface jumping affects lower extremity alignment on jump landing. [Subjects and Methods] Twenty healthy females participated in this study. All subjects performed a drop vertical jump before and after repeated maximum effort trampoline or hard surface jumping. A three-dimensional motion analysis system and two force plates were used to record lower extremity angles, moments, and vertical ground reaction force during drop vertical jumps. [Results] Knee extensor moment after trampoline jumping was greater than that after hard surface jumping...
December 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29642512/finite-element-simulations-of-hard-on-soft-hip-joint-prosthesis-accounting-for-dynamic-loads-calculated-from-a-musculoskeletal-model-during-walking
#16
Alessandro Ruggiero, Massimiliano Merola, Saverio Affatato
The hip joint replacement is one of the most successful orthopedic surgical procedures although it involves challenges to overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime for the replacement joint. It is well known that wear tests have a long duration and they are very expensive, thus studying the effects of geometry, loading, or alignment perturbations may be performed by Finite Element Analysis...
April 9, 2018: Materials
https://www.readbyqxmd.com/read/29605796/femoral-anteversion-assessment-comparison-of-physical-examination-gait-analysis-and-eos-biplanar-radiography
#17
David E Westberry, Linda I Wack, Roy B Davis, James W Hardin
BACKGROUND: Multiple measurement methods are available to assess transverse plane alignment of the lower extremity. RESEARCH QUESTION: This study was performed to determine the extent of correlation between femoral anteversion assessment using simultaneous biplanar radiographs and three-dimensional modeling (EOS imaging), clinical hip rotation by physical examination, and dynamic hip rotation assessed by gait analysis. METHODS: Seventy-seven patients with cerebral palsy (GMFCS Level I and II) and 33 neurologically typical children with torsional abnormalities completed a comprehensive gait analysis with same day biplanar anterior-posterior and lateral radiographs and three-dimensional transverse plane assessment of femoral anteversion...
March 26, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29582097/native-rotational-knee-kinematics-is-restored-after-lateral-uka-but-not-after-medial-uka
#18
Keizo Wada, Daisuke Hamada, Tomoya Takasago, Akihiro Nitta, Tomohiro Goto, Ichiro Tonogai, Yoshihiro Tsuruo, Koichi Sairyo
PURPOSE: The aim of this study was to compare the intraoperative kinematics of medial and lateral unicompartmental knee arthroplasty (UKA) with those of the native knee using a navigation system. METHODS: Six fresh-frozen cadaveric knees were included in the study. Medial UKA was performed in all right knees and lateral UKA was performed in all left knees. All UKA procedures were performed with a computerised navigation system. The tibial internal rotation angle and coronal alignment of the mechanical axis during passive knee flexion were assessed as rotational and varus/valgus kinematics before and after surgery using the navigation system...
March 26, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29573895/the-effect-of-dorsally-angulated-distal-radius-deformities-on-carpal-kinematics-an-in-vitro-biomechanical-study
#19
Clare E Padmore, Helen Stoesser, Masao Nishiwaki, Braden Gammon, G Daniel G Langohr, Emily A Lalone, James A Johnson, Graham J W King
PURPOSE: The purpose was to quantify the effect of distal radius dorsal angulation (DA) on carpal kinematics and the relative roles of the radiocarpal and midcarpal joints during wrist motion. METHODS: Six cadaveric specimens (69 ± 17 y) were mounted at 90° elbow flexion in a custom wrist motion simulator. The wrist was guided through planar passive flexion and extension motion trials (∼ 5°/s). A custom modular distal radius implant was used to simulate native alignment and 3 distal radius DA deformities (10°, 20°, 30°)...
March 21, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29560510/flexing-and-downsizing-the-femoral-component-is-not-detrimental-to-patellofemoral-biomechanics-in-posterior-referencing-cruciate-retaining-total-knee-arthroplasty
#20
Marco A Marra, Marta Strzelczak, Petra J C Heesterbeek, Sebastiaan A W van de Groes, Dennis Janssen, Bart F J M Koopman, Nico Verdonschot, Ate B Wymenga
PURPOSE: When downsizing the femoral component to prevent mediolateral overhang, notching of the anterior femoral cortex may occur, which could be solved by flexing the femoral component. In this study, we investigated the effect of flexion of the femoral component on patellar tendon moment arm, patellofemoral forces and kinematics in posterior-referencing CR-TKA. Our hypothesis was that flexion of the femoral component increases the patellar tendon moment arm, reduces the patellofemoral forces and provides stable kinematics...
March 20, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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