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Biomechanics external fixator

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https://www.readbyqxmd.com/read/29035584/hybrid-fixation-for-ankle-fusion-in-diabetic-charcot-arthropathy
#1
Hani El-Mowafi, Mazen Abulsaad, Yasser Kandil, Ahmed El-Hawary, Samer Ali
BACKGROUND: Ankle fusion is difficult to achieve in the diabetic Charcot ankle Brodsky type 3a because of the poor quality of the bone and the inability to achieve a stable biomechanical construct. The aim of this study was to report the outcome of ankle fusion using a combination of an intramedullary nail and a circular external fixator in patients with diabetic Charcot arthropathy. METHODS: We prospectively studied 24 patients with diabetic Charcot arthropathy of the ankle who were treated by fusion of the tibiotalar joint using a combined retrograde intramedullary nail and Ilizarov external fixator...
October 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/29025603/triangular-block-bridge-method-for-surgical-treatment-of-complex-proximal-humeral-fractures-theoretical-concept-surgical-technique-and-clinical-results
#2
Raffaele Russo, Daniela D'Auria, Michele Ciccarelli, Giuseppe Della Rotonda, Gesualdo D'Elia, Bruno Siciliano
INTRODUCTION: Criteria for classification, indication and choice of a surgical device to treat proximal humeral fractures are still controversial. We report an original technique based on a mechanical concept with a structural principle of a triangle as a rigid body applied to the humeral head fractures in association with other devices. This retrospective study aims to describe in detail the surgical technique and results at long time follow up. METHODS AND MATERIAL: We analysed two series of 101 patients with proximal humeral fractures (mean age, 52...
October 2017: Injury
https://www.readbyqxmd.com/read/28971694/biomechanical-comparison-of-intramedullary-fibular-nail-versus-plate-and-screw-fixation
#3
George Smith, Samuel Peter Mackenzie, Robert James Wallace, Tom Carter, Timothy Oliver White
BACKGROUND: Clinical evidence has shown that percutaneous ankle fracture fixation using an intramedullary fibular nail results in good outcomes at 1 year and reduces postoperative wound complications in patients with vulnerable soft tissues. Confirmatory biomechanical evidence of its strength when used to secure a supination external rotation (SER) IV (AO/OTA 44B-type) fracture, compared with traditional plates and screws, is currently lacking. METHODS: Twenty cadaveric lower limbs (10 cadavers) had a SER IV injury surgically created...
September 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28948328/open-fracture-management-in-low-resource-settings-a-medical-training-experience-in-cambodian-hospitals
#4
Nenad B Tajsic, Puon Sambath, Sophy Nguon, Vannara Sokh, Virak Chheang, Gaute Landsem, Ivan Zaletel, Hans Husum
INTRODUCTION: A prospective interventional study has been carried out on the teaching effect and sustainability of low-cost trauma training program in open tibia fracture management for health workers. MATERIALS AND METHODS: In 2007, an external fixator and a patella-bearing orthosis were developed at a rural workshop in Cambodia. From 2010 to 2016, a core group of nine Cambodian health workers was trained in open fracture management by Norwegian senior surgeons, using the locally made fixator and brace...
September 25, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28930778/radioprotection-with-amifostine-enhances-bone-strength-and-regeneration-and-bony-union-in-a-rat-model-of-mandibular-distraction-osteogenesis
#5
Catherine N Tchanque-Fossuo, Alexis Donneys, Sagar S Deshpande, Deniz Sarhaddi, Noah S Nelson, Laura A Monson, Sara E Dahle, Steve A Goldstein, Steven R Buchman
BACKGROUND: Using distraction osteogenesis (DO) to regenerate robust endogenous bone could greatly enhance postoncologic reconstruction of head and neck cancer. However, radiation (XRT) corrosive effects still preclude DO's immense potential. We posit that adjunctive pretreatment with the radioprotectant amifostine (AMF) can optimize wound healing and allow for successful DO with quantifiable enhancements in bony union and strength despite previous surgical bed irradiation. METHODS: Two groups of murine left hemimandibles were exposed to a human equivalent radiation dosage fractionated over 5 daily doses of 7 Gy...
September 19, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28888569/a-biomechanical-analysis-of-2-constructs-for-metacarpal-spiral-fracture-fixation-in-a-cadaver-model-2-large-screws-versus-3-small-screws
#6
Andre Eu-Jin Cheah, Anthony W Behn, Garet Comer, Jeffrey Yao
PURPOSE: Surgeons confronted with a long spiral metacarpal fracture may choose to fix it solely with lagged screws. A biomechanical analysis of a metacarpal spiral fracture model was performed to determine whether 3 1.5-mm screws or 2 2.0-mm screws provided more stability during bending and torsional loading. METHODS: Second and third metacarpals were harvested from 12 matched pairs of fresh-frozen cadaveric hands and spiral fractures were created. One specimen from each matched pair was fixed with 2 2...
September 7, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28878532/bladder-incarceration-following-anterior-pelvic-infix-of-a-traumatic-pubic-symphysis-diastasis-treated-with-immediate-open-reduction-and-internal-fixation
#7
Mantu Jain, Saurav Narayan Nanda, Soumya Shrikanta Mohapatra, Barada Prasanna Samal
Stabilization after a pelvic fracture can be accomplished using multiple techniques. The anterior external fixator has been traditionally used in variety of unstable pelvis either singly or in combination of posterior screws. These devices are cumbersome and restrict side turning and sitting particularly in obese patients. An alternative, anterior subcutaneous pelvic internal fixation technique (ASPIF) was developed which is well tolerated by patients for mobility and comfort and biomechanically more stable construct Complications of this construct included irritation of the lateral femoral cutaneous nerve, femoral nerve palsy &heterotypic ossification with reduced rates of infections and aseptic loosening as compared to external fixator...
August 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28865300/technical-feasibility-of-personalized-articulating-knee-joint-distraction-for-treatment-of-tibiofemoral-osteoarthritis
#8
T Struik, J E N Jaspers, N J Besselink, P M van Roermund, S Plomp, M J Rudert, F P J G Lafeber, S C Mastbergen
BACKGROUND: Knee osteoarthritis is a highly prevalent degenerative joint disorder characterized by joint tissue damage and pain. Knee joint distraction has been introduced as a joint preserving surgical procedure to postpone knee arthroplasty. An often used standard externally fixation device for distraction poses a burden to patients due to the absence of joint flexion during the 6weeks treatment. Therefore, a personalized articulating distraction device was developed. The aim of this study was to test technical feasibility of this device...
August 12, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28840674/-case-report-comprehensive-treatment-of-forefoot-with-double-brachymetatarsia-in-one-surgical-stage
#9
I Caldiño-Lozada, O Gallegos-de la Torre, R Esperón-Hernández
Brachymetatarsia (shortening of the metatarsal) directly affects the transversal arch of the foot causing severe deformities, such as hallux valgus, divergent toes, overlapping toes, metatarsalgia, all of these alter the biomechanics of the foot and gait. Treatment consists of two main techniques, one-stage lengthening with bone graft or elongation through callotaxis with external fixator; there are variants of both techniques used to minimize the disadvantages of each. The objective of treatment must be to return the structural harmony to the forefoot, improving the biomechanics, resulting in a satisfactory outcome for the patients...
March 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28822222/biomechanical-comparison-of-a-novel-monocortical-and-two-common-bicortical-external-fixation-systems-regarding-rigidity-and-dynamic-stability
#10
Patrick A Varady, Markus Greinwald, Peter Augat
AIM: To biomechanically compare a monocortical single frame external fixator (Orthofix UNYCO) with two bicortical fixator systems (dual frame: Stryker Hoffmann and single frame: Synthes LEF) with respect to system rigidity and stability under cyclic loading. METHODS: The fixator systems were assessed for axial rigidity under loads which would occur clinically during fixator application and dynamic stability (cyclic fatigue) under loads which would occur in the first week postoperatively...
August 19, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28816898/timing-of-postoperative-mechanical-loading-affects-healing-following-anterior-cruciate-ligament-reconstruction-analysis-in-a-murine-model
#11
Christopher L Camp, Amir Lebaschi, Guang-Ting Cong, Zoe Album, Camila Carballo, Xiang-Hua Deng, Scott A Rodeo
BACKGROUND: Following anterior cruciate ligament (ACL) reconstruction, the mechanical loading of the tissues has a significant impact on tendon-to-bone healing. The purpose of this study was to determine the effect of the timing of the initiation of mechanical loading on healing of a tendon graft in a bone tunnel. METHODS: ACL reconstruction using a flexor tendon autograft was performed in 56 mice randomized to 4 groups with differing times to initiation of postoperative mechanical loading: (1) immediate, (2) 5 days, (3) 10 days, or (4) 21 days following surgery...
August 16, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28795328/severe-hemorrhagic-shock-leads-to-a-delayed-fracture-healing-and-decreased-bone-callus-strength-in-a-mouse-model
#12
Katrin Bundkirchen, Christian Macke, Janin Reifenrath, Luisa Marilena Schäck, Sandra Noack, Borna Relja, Philipp Naber, Bastian Welke, Michael Fehr, Christian Krettek, Claudia Neunaber
BACKGROUND: Multiple trauma is frequently associated with hemorrhagic shock and fractures of the extremities. Clinically, the rate of impaired fracture healing (delayed healing and nonunion) seems to be increased in patients with multiple injuries compared with patients with isolated fractures. As the underlying pathogenesis remains poorly understood, we aimed to analyze the biomechanical properties during fracture healing in a murine model. QUESTIONS: The aim of this study was to determine whether fracture healing after severe hemorrhagic shock results in (1) delayed bridging as determined by macroscopic and radiographic assessment, (2) altered conditions of callus components as determined by µCT, and (3) decreased maximum bending moment measured by a three-point-bending test compared with ordinary fracture healing...
August 9, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28771373/biomechanical-evaluation-of-glenoid-reconstruction-with-an-implant-free-j-bone-graft-for-anterior-glenoid-bone-loss
#13
Leo Pauzenberger, Felix Dyrna, Elifho Obopilwe, Philipp R Heuberer, Robert A Arciero, Werner Anderl, Augustus D Mazzocca
BACKGROUND: The anatomic restoration of glenoid morphology with an implant-free J-shaped iliac crest bone graft offers an alternative to currently widely used glenoid reconstruction techniques. No biomechanical data on the J-bone grafting technique are currently available. PURPOSE: To evaluate (1) glenohumeral contact patterns, (2) graft fixation under cyclic loading, and (3) the initial stabilizing effect of anatomic glenoid reconstruction with the implant-free J-bone grafting technique...
October 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28747337/comparisons-of-external-fixator-combined-with-limited-internal-fixation-and-open-reduction-and-internal-fixation-for-sanders-type-2-calcaneal-fractures-finite-element-analysis-and-clinical-outcome
#14
M Pan, L Chai, F Xue, L Ding, G Tang, B Lv
OBJECTIVES: The aim of this study was to compare the biomechanical stability and clinical outcome of external fixator combined with limited internal fixation (EFLIF) and open reduction and internal fixation (ORIF) in treating Sanders type 2 calcaneal fractures. METHODS: Two types of fixation systems were selected for finite element analysis and a dual cohort study. Two fixation systems were simulated to fix the fracture in a finite element model. The relative displacement and stress distribution were analysed and compared...
July 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28715124/chemical-imaging-of-fresh-vascular-smooth-muscle-cell-response-by-epi-detected-stimulated-raman-scattering
#15
Delong Zhang, Wei Chen, Huan Chen, Han-Qing Yu, Ghassan Kassab, Ji-Xin Cheng
An understanding of deformation of cardiovascular tissue under hemodynamic load is crucial for understanding the health and disease of blood vessels. In the present work, an epi-detected stimulated Raman scattering (epi-SRS) imaging platform was designed for in situ functional imaging of vascular smooth muscle cells (VMSCs) in fresh coronary arteries. For the first time, the pressure-induced morphological deformation of fresh VSMCs was imaged with no fixation and in a label free manner. The relation between the loading pressure and the morphological parameters, including angle and length of the VSMCs, were apparent...
July 17, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28689459/biomechanical-comparison-of-supraacetabular-external-fixation-and-anterior-pelvic-bridge-plating
#16
Ali Turgay Çavuşoğlu, Fatma Kübra Erbay, Mehmet Hakan Özsoy, Teyfik Demir
Unstable pelvic ring injuries are complex and risky injuries due to high morbidity and mortality. Although anterior pelvic external fixator is a suitable method for rapid stabilization of an injured pelvic ring, due to some disadvantages such as high complication rate, nerve damage, and difficulties of patient's mobility and comfort, there has recently been increased searching for alternative methods for stabilization of the pelvic ring. Pubic symphysis zone freely moves in pelvic models. This study aims to evaluate the biomechanical stability of anterior pelvic bridge plating and compare it with supraacetabular external fixators in an untreated unstable pelvic fracture model...
July 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28660106/biomechanical-evaluation-of-unilateral-versus-bilateral-c1-lateral-mass-c2-intralaminar-fixation
#17
Nitin Bhatia, Asheen Rama, Brandon Sievers, Ryan Quigley, Michelle H McGarry, Yu-Po Lee, Thay Q Lee
STUDY DESIGN: Biomechanical, cadaveric study. OBJECTIVES: To compare the relative stiffness of unilateral C1 lateral mass-C2 intralaminar fixation to intact specimens and bilateral C1 lateral mass-C2 intralaminar constructs. METHODS: The biomechanical integrity of a unilateral C1 lateral mass-C2 intralaminar screw construct was compared to intact specimens and bilateral C1 lateral mass-C2 intralaminar screw constructs. Five human cadaveric specimens were used...
May 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28641837/corrigendum-to-metaphyseal-locking-plate-as-an-external-fixator-for-open-tibial-fracture-clinical-outcomes-and-biomechanical-assessment-injury-48-2-2017-501-505
#18
Ching-Hou Ma, Chin-Hsien Wu, Jiun-Ru Jiang, Yuan-Kun Tu, Ting-Sheng Lin
No abstract text is available yet for this article.
June 19, 2017: Injury
https://www.readbyqxmd.com/read/28574414/impaired-fracture-healing-with-high-non-union-rates-remains-irreversible-after-traumatic-brain-injury-in-leptin-deficient-mice
#19
F Graef, R Seemann, A Garbe, K Schmidt-Bleek, K D Schaser, J Keller, G Duda, S Tsitsilonis
Patients with traumatic brain injury (TBI) and long-bone fractures can show increased callus formation. This effect has already been reproduced in wild-type (wt) mice. However, the mechanisms remain poorly understood. Leptin is significantly increased following TBI, while its role in bone healing remains unclear. The aim of this study was to evaluate fracture healing in leptin-deficient ob/ob mice and to measure any possible impact of TBI on callus formation. 138 female, 12 weeks old, ob/ob mice were divided into four groups: Control, fracture, TBI and combined trauma...
June 1, 2017: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/28566775/orthopedic-surgery-in-cerebral-palsy-instructional-course-lecture
#20
Deepak Sharan
Orthopedic surgery (OS) plays an important role in the management of cerebral palsy (CP). The objectives of OS are to optimize functions and prevent deformity. Newer developments in OS for CP include emphasis on hip surveillance, minimally invasive procedures, use of external fixators instead of plates and screws, better understanding of lever arm dysfunctions (that can only be corrected by bony OS), orthopedic selective spasticity-control surgery, and single-event multilevel lever arm restoration and anti spasticity surgery, which have led to significant improvements in gross motor function and ambulation, especially in spastic quadriplegia, athetosis, and dystonia...
May 2017: Indian Journal of Orthopaedics
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