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Biomechanics external fixator

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https://www.readbyqxmd.com/read/29890932/biomechanical-analysis-of-walking-gait-when-simulating-the-use-of-an-ilizarov-external-fixator
#1
Robin B Layton, Todd D Stewart, Paul Harwood, Neil Messenger
The Ilizarov frame is an external fixation device, primarily used for the treatment of complex fractures. The authors postulate that the size and weight of the frame may lead to biomechanical adaptations to gait, independent to any injury. Temporospatial characteristics, kinetics and kinematics were assessed when simulating the use of an Ilizarov frame. Fifteen healthy participants performed walking trials, with and without the simulated frame. Significant changes to temporospatial characteristics were identified, with a decreased mean walking speed (with: 1...
June 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29858655/implant-preloading-in-extension-reduces-spring-length-change-in-dynamic-intraligamentary-stabilization-a-biomechanical-study-on-passive-kinematics-of-the-knee
#2
Janosch Häberli, Benjamin Voumard, Clemens Kösters, Daniel Delfosse, Philipp Henle, Stefan Eggli, Philippe Zysset
PURPOSE: Dynamic intraligamentary stabilization (DIS) is a primary repair technique for acute anterior cruciate ligament (ACL) tears. For internal bracing of the sutured ACL, a metal spring with 8 mm maximum length change is preloaded with 60-80 N and fixed to a high-strength polyethylene braid. The bulky tibial hardware results in bone loss and may cause local discomfort with the necessity of hardware removal. The technique has been previously investigated biomechanically; however, the amount of spring shortening during movement of the knee joint is unknown...
June 1, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29797166/strength-of-suture-button-fixation-versus-ligament-reconstruction-in-syndesmotic-injury-a-biomechanical-study
#3
Hong-Yun Li, Ru-Shou Zhou, Zi-Ying Wu, Yutong Zhao, Shi-Yi Chen, Ying-Hui Hua
PURPOSE: To compare the biomechanical characteristics of suture-button fixation versus ligament reconstruction using semitendinosus tendon autograft in treatment of syndesmotic injury in cadaver biomechanical study. METHODS: Eight matched pairs of human cadaveric lower-extremities were measured intact, then following simulated syndesmosis injury by cutting the anterior tibiofibular ligament (AITFL), the distal 15 cm of the interosseous membrane (IO), and the deltoid ligament...
May 24, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29779978/biomechanical-evaluation-of-cable-and-suture-cerclages-for-tuberosity-reattachment-in-a-4-part-proximal-humeral-fracture-model-treated-with-reverse-shoulder-arthroplasty
#4
Dominik Knierzinger, Christian H Heinrichs, Clemens Hengg, Marko Konschake, Franz Kralinger, Werner Schmoelz
BACKGROUND: Sufficient tuberosity fixation in proximal humeral fractures treated with shoulder arthroplasty is essential to gain a good clinical outcome. This biomechanical study evaluated the strength of the reattached tuberosities in reverse total shoulder arthroplasty fixed with cables or with sutures in a cerclage-like technique. Considering the mechanical advantages of flexible titanium alloy cables compared with conventional sutures for cerclage-like fixations, we hypothesized that titanium alloy cables would achieve higher fixation strengths of the tuberosities compared with heavy nonabsorbable sutures...
May 17, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29761212/the-elastic-capacity-of-a-tendon-repair-construct-influences-the-force-necessary-to-induce-gapping
#5
Atesch Ateschrang, Christoph Salewski, Marc-Daniel Ahrend, Anna Janine Schreiner, Michael T Hirschmann, Ulrich Stöckle, Sufian S Ahmad
PURPOSE: Most biomechanical investigations of tendon repairs were based on output measures from hydraulic loading machines, therefore, accounting for construct failure rather than true gapping within the rupture zone. It was hypothesized that the elastic capacity of a tendon-repair construct influences the force necessary to induce gapping. METHODS: A tendon-repair model was created in 48 porcine lower hind limbs, which were allocated to three fixation techniques: (1) Krackow, (2) transosseous and (3) anchor fixation...
May 14, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29744649/a-comparative-biomechanical-study-on-different-fixation-techniques-in-the-management-of-transverse-metaphyseal-diaphyseal-junction-fractures-of-the-distal-humerus-in-children
#6
Allieu Kamara, Xianglu Ji, Tianjing Liu, Yu Zhan, Jianjun Li, Enbo Wang
BACKGROUND: Metaphyseal-diaphyseal junction (MDJ) fractures of the distal humerus are problematic to reduce and more susceptible to post-operative complications. This biomechanical study was designed to compare Kirschner wires (KW), lateral external fixation, and elastic stable intramedullary nails (ESIN) in simulated transverse MDJ fractures of various heights. METHOD: Sagittally oblique, transverse MDJ fractures were created in fourth-generation composite bone models at three levels: high, mid, and low fractures, respectively, and then fixed with either Kirschner wires, lateral external fixation (EF), or ESIN respectively and tested in extension, flexion, valgus, varus, internal, and external rotations...
May 9, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29731951/advanced-computational-methods-in-bio-mechanics
#7
REVIEW
Waleed M S Al Qahtani, Mohamed I El-Anwar
A novel partnership between surgeons and machines, made possible by advances in computing and engineering technology, could overcome many of the limitations of traditional surgery. By extending surgeons' ability to plan and carry out surgical interventions more accurately and with fewer traumas, computer-integrated surgery (CIS) systems could help to improve clinical outcomes and the efficiency of healthcare delivery. CIS systems could have a similar impact on surgery to that long since realised in computer-integrated manufacturing...
April 15, 2018: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29727021/biomechanics-of-two-external-fixator-devices-used-in-rat-femoral-fractures
#8
Liza Osagie-Clouard, Joshua Kaufmann, Gordon Blunn, Melanie Coathup, Catherine Pendegrass, Richard Meeson, Timothy Briggs, Mehran Moazen
The use of external fixators allows for the direct investigation of newly formed interfragmentary bone, and the radiographic evaluation of the fracture. We validated the results of a finite element model with the in vitro stiffness' of two widely used external fixator devices used for in vivo analysis of fracture healing in rat femoral fractures with differing construction (Ti alloy ExFix1 and PEEK ExFix2). Rat femoral fracture fixation was modelled using two external fixators. For both constructs an osteotomy of 2...
May 4, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29694687/sclerostin-neutralizing-antibody-treatment-enhances-bone-formation-but-does-not-rescue-mechanically-induced-delayed-healing
#9
Bettina Kruck, Elizabeth A Zimmermann, Sophie Damerow, Christine Figge, Catherine Julien, Dag Wulsten, Tobias Thiele, Madge Martin, Reggie Hamdy, Marie K Reumann, Georg N Duda, Sara Checa, Bettina M Willie
During bone healing, tissue formation processes are governed by mechanical strain. Sost/sclerostin, a key Wnt signaling inhibitor and mechano-sensitive pathway, is downregulated in response to mechanical loading. Sclerostin neutralizing antibody (SclAb) increases bone formation. Nevertheless, it remains unclear whether sclerostin inhibition can rescue bone healing in situations of mechanical instability, which otherwise delay healing. We investigated SclAb's influence on tissue formation in a mouse femoral osteotomy, stabilized with rigid or semirigid external fixation...
April 25, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29679256/biomechanical-features-of-six-design-of-the-delta-external-fixator-for-treating-pilon-fracture-a-finite-element-study
#10
Muhammad Hanif Ramlee, Mohd Ayub Sulong, Evelyn Garcia-Nieto, Daniel Angure Penaranda, Antonio Ros Felip, Mohammed Rafiq Abdul Kadir
Pilon fractures can be caused by high-energy vertical forces which may result in long-term patient immobilization. Many experts in orthopedic surgery recommend the use of a Delta external fixator for type III Pilon fracture treatment. This device can promote immediate healing of fractured bone, minimizing the rate of complications as well as allowing early mobilization. The characteristics of different types of the Delta frame have not been demonstrated yet. By using the finite element method, this study was conducted to determine the biomechanical characteristics of six different configurations (Model 1 until Model 6)...
April 21, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29582693/a-theoretical-analysis-and-finite-element-simulation-of-fixator-bone-system-stiffness-on-healing-progression
#11
Jianfeng Li, Xia Zhao, Xiaojie Hu, Chunjing Tao, Run Ji
INTRODUCTION: The unilateral external fixator has become a quick and easy application for fracture stabilization of the extremities; the main value for evaluation of mechanical stability of the external fixator is stiffness. The stiffness property of the external fixator affects the local biomechanical environment of fractured bone. METHODS: In this study, a theoretical model with changing Young's modulus of the callus is established by using the Castigliano's theory, investigating compression stiffness, torsional stiffness and bending stiffness of the fixator-bone system during the healing process...
March 1, 2018: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29502990/examination-of-skill-acquisition-and-grader-bias-in-a-distal-radius-fracture-fixation-model
#12
Matthew D Putnam, Julie E Adams, Paul Lender, Ann E Van Heest, Janet R Shanedling, David J Nuckley, Joan E Bechtold
OBJECTIVES: Primary: Assess the ability of faculty graders to predict the objectively measured strength of distal radius fracture fixation. Secondary: Compare resident skill variation and retention related to other knowable training data. DESIGN: Residents were allowed 60 minutes to stabilize a standardized distal radius fracture using an assigned fixed-angle volar plate. Faculty observed and subjectively graded the residents without providing real-time feedback...
March 1, 2018: Journal of Surgical Education
https://www.readbyqxmd.com/read/29461396/absolute-versus-relative-fracture-fixation-impact-on-fracture-healing
#13
Brent L Norris, Gerald Lang, Thomas A Toney Russell, David L Rothberg, William M Ricci, Joseph Borrelli
The goals of all orthopaedic surgeons treating fractures are, and will remain, obtaining union of the fracture with a well-aligned and functional limb while minimizing the risk of complications. This requires us to understand how the biomechanical environment of the fracture affects healing and to be able to discern which mechanical environment is preferred over another. Understanding the spectrum of stability imparted by our current surgical devices is paramount to giving our patients the best opportunity to heal and recover from their injury...
March 2018: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29452734/calcar-screw-position-in-proximal-humerus-fracture-fixation-don-t-miss-high
#14
Samir Mehta, Matthew Chin, Jennifer Sanville, Surena Namdari, Michael W Hast
INTRODUCTION: In locked plate fixation of proximal humerus fractures, the calcar is an important anchor point for screws providing much-needed medial column support. Most locking plate implants utilize a fixed-trajectory locking screw to achieve this goal. Consequently, adjustments of plate location to account for patient-specific anatomy may result in a screw position outside of the calcar. To date, little is known about the consequences of "missing" the calcar during plate positioning...
March 2018: Injury
https://www.readbyqxmd.com/read/29367057/estrogen-receptor-%C3%AE-er%C3%AE-but-not-er%C3%AE-signaling-is-crucially-involved-in-mechanostimulation-of-bone-fracture-healing-by-whole-body-vibration
#15
Melanie Haffner-Luntzer, Anna Kovtun, Ina Lackner, Yvonne Mödinger, Steffen Hacker, Astrid Liedert, Jan Tuckermann, Anita Ignatius
Mechanostimulation by low-magnitude high frequency vibration (LMHFV) has been shown to provoke anabolic effects on the intact skeleton in both mice and humans. However, experimental studies revealed that, during bone fracture healing, the effect of whole-body vibration is profoundly influenced by the estrogen status. LMHFV significantly improved fracture healing in ovariectomized (OVX) mice being estrogen deficient, whereas bone regeneration was significantly reduced in non-OVX, estrogen-competent mice. Furthermore, estrogen receptors α (ERα) and β (ERβ) were differentially expressed in the fracture callus after whole-body vibration, depending on the estrogen status...
May 2018: Bone
https://www.readbyqxmd.com/read/29298079/effect-of-dynamic-changes-in-anterior-cruciate-ligament-in-situ-graft-force-on-the-biological-healing-response-of-the-graft-tunnel-interface
#16
Richard Ma, Michael Schär, Tina Chen, Marco Sisto, Joseph Nguyen, Clifford Voigt, Xiang-Hua Deng, Scott A Rodeo
BACKGROUND: Anterior cruciate ligament (ACL) grafts that are placed for reconstruction are subject to complex forces. Current "anatomic" ACL reconstruction techniques may result in greater in situ graft forces. The biological effect of changing magnitudes of ACL graft force on graft-tunnel osseointegration is not well understood. PURPOSE: The research objective is to determine how mechanical force on the ACL graft during knee motion affects tendon healing in the tunnel...
March 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29245327/locked-plating-as-an-external-fixator-in-treating-tibial-fractures-a-prisma-compliant-systematic-review
#17
REVIEW
Peng Luo, Ding Xu, Jia Wu, Yi-Heng Chen
OBJECTIVES: This article is a systematic review of the published literature about the biomechanics, functional outcomes, and complications of a locked plate as an external fixator in treating tibial fractures. METHODS: We searched the PubMed, Ovid Medline, Embase, ScienceDirect, and Cochrane Library databases to retrieve the relevant studies. Studies published in English and Chinese which assessed adult patients and more than 4 cases who had sustained any type of fresh tibial fracture treated with the external locking plate, provided that they reported functional outcomes, range of motion (ROM), union or complication rates, and the biomechanical studies of external locked plating are also included...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29230427/biomechanical-comparison-of-single-versus-double-row-capsulolabral-repair-for-shoulder-instability-a-review
#18
REVIEW
Matthew John Yousif, James Bicos
Background: The glenohumeral joint is the most commonly dislocated joint in the body. Failure rates of capsulolabral repair have been reported to be approximately 8%. Recent focus has been on restoration of the capsulolabral complex by a double-row capsulolabral repair technique in an effort to decrease redislocation rates after arthroscopic capsulolabral repair. Purpose: To present a review of the biomechanical literature comparing single- versus double-row capsulolabral repairs and discuss the previous case series of double-row fixation...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29162247/severe-tibial-plateau-fractures-schatzker-v-vi-open-reduction-and-internal-fixation-versus-hybrid-external-fixation
#19
Maria L Bertrand, F Javier Pascual-López, Enrique Guerado
Tibial plateau fractures (TPF) are highly prone to complications and adverse effects. Their treatment has long been a matter of controversy, as fracture patterns and possible damage to soft tissues can easily aggravate complications. On the one hand, open reduction and internal fixation (ORIF) techniques provide a good approach to joint shape restoration and biomechanics, but they may also provoke a higher rate of soft-tissue complications. On the other, hybrid external fixation (HEF), although allowing little facility for reduction, may, theoretically, produce much less damage to the soft tissues...
November 2017: Injury
https://www.readbyqxmd.com/read/29162245/ultrasound-guided-supra-acetabular-pin-placement-in-pelvic-external-fixation-description-of-a-surgical-technique-and-results
#20
Francisco Chana-Rodríguez, Manuel Cuervas-Mons, José Rojo-Manaute, Félix Mora, Juan Arnal, Javier Vaquero-Martín
INTRODUCTION: Pelvic fracture in trauma patients can lead to hemodynamic instability. External fixation is a treatment capable of stabilizing these injuries in the context of damage control surgery. Supra-acetabular pin offers the greater biomechanical stability but requires the use of intraoperative fluoroscopy. The aim of this study was to analyze our results for an ultrasound-guided supra-acetabular pinning. MATERIAL AND METHODS: Cross-sectional study with cadaveric specimens...
November 2017: Injury
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