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https://www.readbyqxmd.com/read/29168434/changes-in-knee-shape-and-geometry-resulting-from-total-knee-arthroplasty
#1
Mohsen Akbari Shandiz, Paul Boulos, Stefan Karl Saevarsson, Heiko Ramm, Chun Kit Jack Fu, Stephen Miller, Stefan Zachow, Carolyn Anglin
Changes in knee shape and geometry resulting from total knee arthroplasty can affect patients in numerous important ways: pain, function, stability, range of motion, and kinematics. Quantitative data concerning these changes have not been previously available, to our knowledge, yet are essential to understand individual experiences of total knee arthroplasty and thereby improve outcomes for all patients. The limiting factor has been the challenge of accurately measuring these changes. Our study objective was to develop a conceptual framework and analysis method to investigate changes in knee shape and geometry, and prospectively apply it to a sample total knee arthroplasty population...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29167870/association-of-the-hospital-readmissions-reduction-program-with-surgical-readmissions
#2
Tudor Borza, Mary K Oerline, Ted A Skolarus, Edward C Norton, Andrew M Ryan, Chad Ellimoottil, Justin B Dimick, Vahakn B Shahinian, Brent K Hollenbeck
Importance: Readmissions after surgery lead to poor patient outcomes and increased costs. The Hospital Readmissions Reduction Program (HRRP) penalizes hospitals with excess readmissions after specified medical and surgical discharges. Objective: To evaluate the association of the HRRP with readmissions after major joint surgery (targeted) and procedures with historically high rates not under its purview (nontargeted). Design, Setting, and Participants: In this population-based analysis using a 20% Medicare sample, a retrospective cohort study was performed of patients undergoing one of 5 major surgical procedures between January 1, 2006, and November 30, 2014...
November 22, 2017: JAMA Surgery
https://www.readbyqxmd.com/read/29164285/referent-control-of-the-orientation-of-posture-and-movement-in-the-gravitational-field
#3
Aditi A Mullick, Nicolas A Turpin, Szu-Chen Hsu, Sandeep K Subramanian, Anatol G Feldman, Mindy F Levin
This study addresses the question of how posture and movement are oriented with respect to the direction of gravity. It is suggested that neural control levels coordinate spatial thresholds at which multiple muscles begin to be activated to specify a referent body orientation (RO) at which muscle activity is minimized. Under the influence of gravity, the body is deflected from the RO to an actual orientation (AO) until the emerging muscle activity and forces begin to balance gravitational forces and maintain body stability...
November 21, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29162607/computational-study-on-the-effect-of-malalignment-of-the-tibial-component-on-the-biomechanics-of-total-knee-arthroplasty-a-finite-element-analysis
#4
D-S Suh, K-T Kang, J Son, O-R Kwon, C Baek, Y-G Koh
OBJECTIVES: Malalignment of the tibial component could influence the long-term survival of a total knee arthroplasty (TKA). The object of this study was to investigate the biomechanical effect of varus and valgus malalignment on the tibial component under stance-phase gait cycle loading conditions. METHODS: Validated finite element models for varus and valgus malalignment by 3° and 5° were developed to evaluate the effect of malalignment on the tibial component in TKA...
November 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/29159677/not-all-sagittal-band-tears-come-with-extensor-instability-a-case-report-with-radiological-and-operative-correlation
#5
Shuo Li, Jeffrey J Brooks, Jubin Jacob, Ahmadreza Ghasemiesfe, Greg B Marrinan
The sagittal bands are a component of the extensor hood. They serve an important role in stabilizing the extensor tendon by forming a "check-rein" to radial-ulnar translation of the tendon over the metacarpal head, and extending the metacarpophalangeal (MCP) joint by virtue of attaching the extensor tendon to the palmar plate. Injury to the sagittal band is thought to cause extensor instability and subluxation to the contralateral side by disruption of this "check-rein" function, although recent evidence from cadaver studies suggests that ulnar sagittal band tear may be spared of extensor instability...
November 20, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29157249/biomechanical-study-of-isolated-radial-head-dislocation
#6
Naoki Hayami, Shohei Omokawa, Akio Iida, Jirachart Kraisarin, Hisao Moritomo, Pasuk Mahakkanukrauh, Takamasa Shimizu, Kenji Kawamura, Yasuhito Tanaka
BACKGROUND: Isolated radial head dislocation is a rare injury with an unclear pathomechanism, and the treatment is controversial. The purpose of the present study was to investigate the biomechanical contributions of the annular ligament, quadrate ligament, interosseous membrane, and annular ligament reconstructions to proximal radioulnar joint stability. METHODS: Five fresh frozen cadaveric upper extremities were amputated above the elbow and solidly fixed on a customized jig...
November 21, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29156379/evaluating-the-immediate-effects-of-wearing-foot-orthotics-in-children-with-joint-hypermobility-syndrome-jhs-by-analysis-of-temperospatial-parameters-of-gait-and-dynamic-balance-a-preliminary-study
#7
P McDermott, E Wolfe, C Lowry, K Robinson, H P French
Joint Hypermobility Syndrome (JHS) in children, presents with increased joint range of motion and can lead to altered gait strategies and reduced dynamic balance. Despite limited evidence foot orthoses are sometimes prescribed to patients with JHS with the aim to improve the stability of their gait pattern and theoretically reduce associated symptoms of fatigue and joint pain. The purpose of this study was therefore to analyse the immediate effects of 'off the shelf' orthoses on temporospatial parameters of gait and dynamic balance in this cohort...
November 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29156167/advancements-in-bone-fixation-utilizing-novel-biointegrative-fixation-technology
#8
REVIEW
Bob Baravarian, Tal Pnina Lindner, Ronit Merchav-Feuermann
Advancement in orthopedics have been increasing rapidly. The most important advances have been in fixation. With time, metallic hardware will begin to be replaced by materials that become one with the body. This progress will not only aid in the repair process it will allow permanent and improved reinforcement of the fixated region. Biointegrative technology is a promising new generation of materials capable of achieving this goal. Over time, it is expected that plates, screws, pins, interference screws, and even possibly joint replacements will incorporate into patients' bodies, negating the need for hardware removal and adding structure and stability to an iatrogenically weakened area...
January 2018: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/29155842/posterior-column-acetabular-fracture-fixation-using-a-w-shaped-angular-plate-a-biomechanical-analysis
#9
Ke Su, Song Liu, Tao Wu, Yingchao Yin, Ruipeng Zhang, Shilun Li, Yingze Zhang
OBJECTIVE: The purpose of this study was to compare the stability and feasibility of four fixation constructs in a posterior column acetabular fracture: one reconstruction plate, one reconstruction plate and lag screw, two reconstruction plates, and a W-shaped acetabular angular plate. METHODS: Twenty embalmed cadaveric pelvises with a posterior column acetabular fractures were allocated to one of four groups: 1) a reconstruction plate, 2) a reconstruction plate with a posterior column lag screw, 3) double reconstruction plates, and 4) a W-shaped acetabular angular plate...
2017: PloS One
https://www.readbyqxmd.com/read/29155415/phase-diagrams-of-ferroelectric-nanocrystals-strained-by-an-elastic-matrix
#10
Andrei Nikitchenko, Andrei V Azovtsev, Nikolay A Pertsev
Ferroelectric crystallites embedded into a dielectric matrix experience temperature-dependent elastic strains caused by differences in the thermal expansion of the crystallites and the matrix. Owing to the electrostriction, these lattice strains may affect polarization states of ferroelectric inclusions significantly, making them different from those of a stress-free bulk crystal. Here, using a nonlinear thermodynamic theory, we study the mechanical effect of elastic matrix on the phase states of embedded single-domain ferroelectric nanocrystals...
November 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29154637/stability-and-change-in-mother-child-planning-over-middle-childhood
#11
Mary Gauvain, Susan M Perez, Z Reisz
This longitudinal research examines maternal and child behaviors during joint planning over a 3-year period of middle childhood. 118 mother-child dyads were observed once a year beginning when the children were 8 years of age. Coding focused on mother and child planning behaviors, maternal instructional support, and child task engagement. Multilevel modeling was used to compare 3 models of stability and change: stability, normative developmental change, and individual differences in change. Results indicate that normative developmental change was the best predictor of mother and child planning behaviors and maternal guidance...
November 20, 2017: Developmental Psychology
https://www.readbyqxmd.com/read/29154266/rehabilitation-of-neglected-monteggia-fracture-dislocations-in-children
#12
Azad Yıldırım, Kemal Nas
PURPOSE: There are limited studies related to the rehabilitation of neglected Monteggia fracture-dislocations. This study reports the results of the rehabilitation of neglected Monteggia fractures and dislocations and the best treatment options available. MATERIAL AND METHODS: Thirteen children were rehabilitated between 2009 and 2012. A retrospective chart review was conducted to record the following: age, gender, anatomic region of fractures, time delay from symptom onset to fracture, Bado classification, Mayo Elbow Performance Index (MEPI) which includes pain, range of motion and daily life comfort, surgeries, length of hospitalization, location and pattern of fracture, length of follow-up and complications...
November 6, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29151999/mid-term-outcomes-after-open-reduction-internal-fixation-of-proximal-interphalangeal-joint-dorsal-fracture-dislocations-through-a-volar-shotgun-approach-and-a-review-of-the-literature
#13
REVIEW
Juan Marcelo Giugale, Juntian Wang, Robert A Kaufmann, John R Fowler
Background: Proximal interphalangeal (PIP) fracture dislocations remain a complex injury pattern to treat. There are several treatment methods available aimed to restore stability, preserve range of motion, and reconstitute the articular surface. This study looked at the mid-term clinical and radiographic results of open reduction internal fixation through a shotgun approach of comminuted PIP fracture dislocations. Methods: A retrospective review was conducted of all PIP fracture dislocations treated through a volar, shotgun approach at a single institution over a 15-year period...
2017: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/29148848/corrigendum
#14
(no author information available yet)
Klemola T, Leppilahti J, Laine V, et al. Effect of first tarsometatarsal joint derotational arthrodesis on first ray dynamic stability compared to distal chevron osteotomy. Foot Ankle Int. 2017;38(8):847-854. (Original DOI: 10.1177/1071100717706153).
November 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/29146433/a-novel-technique-for-cervical-facet-joint-hyperplasia-spondylotic-radiculopathy-by-laminar-and-lateral-mass-screw-co-fixations
#15
Sun-Ren Sheng, Ke Wang, Majid Nisar, Jiao-Xiang Chen, Ai-Min Wu, Xiang-Yang Wang
OBJECTIVE: To describe the novel technique and report the outcomes of cervical spondylotic radiculopathy caused by facet joint hyperplasia treated with minimally invasive surgery by laminar and lateral mass screw co-fixations. METHOD: In this retrospective study, patients with spondylotic radiculopathy caused by facet joint hyperplasia underwent this technique in our unit between January 2010 and June 2015. Hospital charts, magnetic resonance imaging studies, and follow-up records for all the patients were reviewed...
November 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29146012/a-biomechanical-cadaveric-study-comparing-superior-capsule-reconstruction-using-fascia-lata-allograft-with-human-dermal-allograft-for-irreparable-rotator-cuff-tear
#16
Teruhisa Mihata, Christopher N H Bui, Masaki Akeda, Matthew A Cavagnaro, Michael Kuenzler, Alexander B Peterson, Michelle H McGarry, Yasuo Itami, Orr Limpisvasti, Masashi Neo, Thay Q Lee
BACKGROUND: Biomechanical and clinical success of the superior capsule reconstruction (SCR) using fascia lata (FL) grafts has been reported. In the United States, human dermal (HD) allograft has been used successfully for SCRs; however, the biomechanical characteristics have not been reported. METHODS: Eight cadaveric shoulders were tested in 5 conditions: (1) intact; (2) irreparable supraspinatus tear; (3) SCR using FL allograft with anterior and posterior suturing; (4) SCR using HD allograft with anterior and posterior suturing; and (5) SCR using HD allograft with posterior suturing...
December 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29145437/assessment-of-the-suitability-of-biodegradable-rods-for-use-in-posterior-lumbar-fusion-an-in-vitro-biomechanical-evaluation-and-finite-element-analysis
#17
Fon-Yih Tsuang, Yueh-Ying Hsieh, Yi-Jie Kuo, Chia-Hsien Chen, Feng-Huei Lin, Chen-Sheng Chen, Chang-Jung Chiang
Interbody fusion with posterior instrumentation is a common method for treating lumbar degenerative disc diseases. However, the high rigidity of the fusion construct may produce abnormal stresses at the adjacent segment and lead to adjacent segment degeneration (ASD). As such, biodegradable implants are becoming more popular for use in orthopaedic surgery. These implants offer sufficient stability for fusion but at a reduced stiffness. Tailored to degrade over a specific timeframe, biodegradable implants could potentially mitigate the drawbacks of conventional stiff constructs and reduce the loading on adjacent segments...
2017: PloS One
https://www.readbyqxmd.com/read/29144991/finite-element-simulation-on-posterior-tibial-tendinopathy-load-transfer-alteration-and-implications-to-the-onset-of-pes-planus
#18
Duo Wai-Chi Wong, Yan Wang, Aaron Kam-Lun Leung, Ming Yang, Ming Zhang
BACKGROUND: Posterior tibial tendinopathy is a challenging foot condition resulting in pes planus, which is difficult to diagnose in the early stage. Prior to the deformity, abnormal internal load transfer and soft tissue attenuation are anticipated. The objective of this study was to investigate the internal load transfer and strain of the ligaments with posterior tibial tendinopathy, and the implications to pes planus and other deformities. METHODS: A three-dimensional finite element model of the foot and ankle was reconstructed from magnetic resonance images of a 28-year-old normal female...
November 3, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29143300/effect-of-restraining-the-base-of-support-on-the-other-biomechanical-features-in-patients-with-cerebellar-ataxia
#19
C Conte, Mariano Serrao, L Cuius, A Ranavolo, S Conforto, F Pierelli, L Padua
This study aimed to analyze the biomechanical consequences of reducing the base of support in patients with ataxia. Specifically, we evaluated the spatio-temporal parameters, upper- and lower-body kinematics, muscle co-activation, and energy recovery and expenditure. The gaits of 13 patients were recorded using a motion analysis system in unperturbed and perturbed walking conditions. In the latter condition, patients had to walk using the same step width and speed of healthy controls. The perturbed walking condition featured reduced gait speed, step length, hip and knee range of motion, and energy recovery and increased double support duration, gait variability, trunk oscillation, and ankle joint muscle co-activation...
November 15, 2017: Cerebellum
https://www.readbyqxmd.com/read/29143041/joint-experimental-and-theoretical-studies-of-the-surprising-stability-of-the-aryl-pentazole-upon-noncovalent-binding-to-%C3%AE-cyclodextrin
#20
Yu-Zhang Yang, Xiao-Feng Liu, Ru-Bo Zhang, Si-Ping Pang
Herein, binding of the β-cyclodextrin (β-CD) host to the unstable aryl pentazole guest has been confirmed experimentally and theoretically. After the confinement of aryl pentazole, electron density reorganization was studied by M06-2X dispersion-corrected DFT and further reflected in the characteristic shift in the NMR spectra. Among the host-guest complexes, the inclusion complex is favored with the phenyl ring expectedly encapsulated within the cavity through noncovalent interactions such as hydrogen bonding, C-Hπ, and the special Csp(2)-HH-Csp(3) bonding discovered by the NBO, QTAIM, and NCI-RDG theories...
November 16, 2017: Physical Chemistry Chemical Physics: PCCP
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