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Biomechanics external fixator

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https://www.readbyqxmd.com/read/28228100/influence-of-hooks-and-a-lag-screw-on-internal-fixation-plates-for-lateral-malleolar-fracture-a-biomechanical-and-ergonomic-study
#1
Rina Sakai, Masataka Uchino, Terumasa Yoneo, Yasuaki Ohtaki, Hiroaki Minehara, Terumasa Matsuura, Tsutomu Gomi, Masanobu Ujihira
BACKGROUND: For internal fixation of AO classification Type B lateral malleolar fracture, insertion of lag screws into the fracture plane and fixation with a one-third tubular plate as a neutralization plate are the standard treatment procedures. The one-third tubular plate is processed to a hook shape and hung on the distal end of the fibula. In this study, to compare the function of the hook and lag screws of a one-third tubular plate and LCP for osteosynthesis of lateral malleolar fracture, mechanical indices of internal fixation were compared among the one-third tubular plates with lag screws with and without the hook and a locking compression plate...
February 23, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28185981/analysis-of-the-s2-alar-iliac-screw-as-compared-with-the-traditional-iliac-screw-does-it-increase-stability-with-sacroiliac-fixation-of-the-spine
#2
Daniel G Hoernschemeyer, Troy D Pashuck, Ferris M Pfeiffer
BACKGROUND CONTEXT: Arthrodesis of the lumbosacral junction continues to be a challenge in pediatric and adult spinal deformity surgery. PURPOSE: To evaluate the biomechanical rigidity of two types of lumbosacral fixation. Our hypothesis was that the use of S2 alar-iliac (S2AI) fixation will result in statistically similar biomechanical fixation as compared with use of an iliac screw with a 95% confidence interval. STUDY SETTING: Controlled biomechanical laboratory METHODS: Ten human cadaveric lumbosacral specimens were separated into two test groups: (1) S2AI (n=5) and (2) iliac screw (n=5)...
February 6, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28129269/the-effect-of-varying-tension-of-a-suture-button-construct-in-fixation-of-the-tibiofibular-syndesmosis-evaluation-using-stress-computed-tomography
#3
John Morellato, Hakim Louati, Andrew Bodrogi, Andrew Stewart, Steven Papp, Allan Liew, Wade Gofton
BACKGROUND/PURPOSE: There have been no studies assessing the optimal biomechanical tension of suture button constructs. The purpose of this study was to assess optimal tensioning of suture button fixation and its ability to maintain reduction under loaded conditions using a stress computed tomography (CT) model. METHODS: Ten cadaveric lower limbs disarticulated at the knee were used. The limbs were placed in a modified ankle load frame that allowed for the application of sustained torsional axial or combined torsional/axial loads...
February 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28103852/stiffness-of-the-locking-compression-plate-as-an-external-fixator-for-treating-distal-tibial-fractures-a-biomechanics-study
#4
Wei Liu, Lihui Yang, Xiaochuan Kong, Likun An, Gang Hong, Zicheng Guo, Lei Zang
BACKGROUND: Locking compress plate, as external fixator, is an attractive technique for distal tibial fracture treatment. But it still remains unclear whether the external LCP has sufficient stiffness. Thus, the present study aims to make a comprehensive evaluation of the stiffness of external locking compress plate when it is used as an external fixator in distal tibial fractures treatment. METHODS: Composite tibia was used to simulate distal tibia fracture (Orthopedic Trauma Association type 43 A3 fracture)...
January 19, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28060814/glenohumeral-joint-kinematics-following-clavicular-fracture-and-repairs
#5
Claudio Rosso, Michael Nasr, Kempland C Walley, Ethan R Harlow, Babak Haghpanah, Ashkan Vaziri, Arun J Ramappa, Ara Nazarian, Joseph P DeAngelis
BACKGROUND: The purpose of this biomechanical study was to determine the effect of shortened clavicle malunion on the center of rotation of the glenohumeral (GH) joint, and the capacity of repair to restore baseline kinematics. METHODS: Six shoulders underwent automated abduction (ABD) and abbreviated throwing motion (ATM) using a 7-DoF automated upper extremity testing system in combination with an infrared motion capture system to measure the center of rotation of the GH joint...
2017: PloS One
https://www.readbyqxmd.com/read/27975121/-mechanobiology-of-fracture-healing%C3%A2-part-2-relevance-for-internal-fixation-of-fractures
#6
L Claes
Clinical studies do not allow a quantitative correlation between stability of fracture fixation and outcome of bone healing. This limits the biomechanical improvement of fracture fixation techniques. The most practical quantitative parameter to describe the stability of a fracture fixation is the stiffness. This can be determined for several types of fixation through biomechanical methods and in some clinical studies in vivo. By using numerical fracture healing models, it is now possible to use the tissue differentiation rules found in basic research to calculate optimal stiffness parameters for various fixation techniques...
January 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/27919511/metaphyseal-locking-plate-as-an-external-fixator-for-open-tibial-fracture-clinical-outcomes-and-biomechanical-assessment
#7
Ching-Hou Ma, Chin-Hsien Wu, Jiun-Ru Jiang, Yuan-Kun Tu, Ting-Sheng Lin
OBJECTIVE: This study aimed to evaluate the outcome of using a metaphyseal locking plate as a definitive external fixator for treating open tibial fractures based on biomechanical experiments and analysis of clinical results. METHODS: A metaphyseal locking plate was used as an external fixator in 54 open tibial fractures in 52 patients. The mean follow-up was 38 months (range, 20-52 months). Moreover, static axial compression and torsional tests were performed to evaluate the strength of the fixation techniques...
February 2017: Injury
https://www.readbyqxmd.com/read/27885572/improving-tribological-and-anti-bacterial-properties-of-titanium-external-fixation-pins-through-surface-ceramic-conversion
#8
Huan Dong, Tatiana Mukinay, Maojun Li, Richard Hood, Sein Leung Soo, Simon Cockshott, Rachel Sammons, Xiaoying Li
In this study, an advanced ceramic conversion surface engineering technology has been applied for the first time to self-drilling Ti6Al4V external fixation pins to improve their performance in terms of biomechanical, bio-tribological and antibacterial properties. Systematic characterisation of the ceramic conversion treated Ti pins was carried out using Scanning electron microscope, X-ray diffraction, Glow-discharge optical emission spectroscopy, nano- and micro-indentation and scratching; the biomechanical and bio-tribological properties of the surface engineered Ti pins were evaluated by insertion into high density bone simulation material; and the antibacterial behaviour was assessed with Staphylococcus aureus NCTC 6571...
January 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/27848193/from-prevention-of-pin-tract-infection-to-treatment-of-osteomyelitis-during-paediatric-external-fixation
#9
REVIEW
Dimitri Ceroni, Catherine Grumetz, Odile Desvachez, Sophie Pusateri, Pierre Dunand, Eleftheria Samara
Pin-tract infection (PTI) is the most commonly expected problem, or even an almost inevitable complication, when using external fixation. Left unteated, PTI will progress unavoidably, lead to mechanical pin loosening, and ultimately cause instability of the external fixator pin-bone construct. Thus, PTI remains a clinical challenge, specifically in cases of limb lengthening or deformity correction. Standardised pin site protocols which encompass an understanding of external fixator biomechanics and meticulous surgical technique during pin and wire insertion, postoperative pin site care and pin removal could limit the incidence of major infections and treatment failures...
December 2016: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/27810029/distal-fibula-fracture-fixation-biomechanical-evaluation-of-three-different-fixation-implants
#10
Ashleen R Knutsen, Sophia N Sangiorgio, Chang Liu, Steve Zhou, Tibor Warganich, John Fleming, Thomas G Harris, Edward Ebramzadeh
BACKGROUND: The goal of this study was to evaluate the biomechanical performance of three distal fibula fracture fixation implants in a matched pair cadaveric fibula model: (1) a 5-hole compression plate with lag screw, (2) a 5-hole locking plate with lag screw, and (3) the 6-hole tabbed-plate with locking screws. METHODS: Three-dimensional motions between the proximal and distal fibular segments were measured under cyclic valgus bending, cyclic compressive axial loading, and cyclic torsional external-rotation loading...
December 2016: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/27784330/c5ar-inhibition-in-the-early-inflammatory-phase-does-not-affect-bone-regeneration-in-a-model-of-uneventful-fracture-healing
#11
Christian Ehrnthaller, Markus Huber-Lang, Anna Kovtun, Anna Elise Rapp, Julia Kemmler, Florian Gebhard, Anita Ignatius
BACKGROUND: Recent studies were able to demonstrate involvement of the complement cascade in bone biology. Further studies analyzed the role of complement in traumatic injuries and demonstrated negative effects after excessive systemic activation of the inflammatory response with early abrogation of complement activation after application of a C5aR-antagonist exerting beneficial effects upon bone regeneration. In contrast, own fracture healing experiments with complement-deficient animals implied a crucial role of the complement cascade for sufficient fracture healing...
October 26, 2016: European Journal of Medical Research
https://www.readbyqxmd.com/read/27755331/the-effect-of-varying-tension-of-a-suture-button-construct-in-fixation-of-the-tibiofibular-syndesmosis-evaluation-using-stress-computed-tomography
#12
John Morellato, Hakim Louati, Andrew Bodrogi, Andrew Stewart, Steven Papp, Allan Liew, Wade Gofton
BACKGROUND/PURPOSE: There have been no studies assessing the optimal biomechanical tension of suture button constructs. The purpose of this study was to assess optimal tensioning of suture button fixation and its ability to maintain reduction under loaded conditions using a stress computed tomography (CT) model. METHODS: Ten cadaveric lower limbs disarticulated at the knee were used. The limbs were placed in a modified ankle load frame that allowed for the application of sustained torsional axial, or combined torsional/axial loads...
October 13, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27735977/biomechanical-and-cost-comparisons-of-near-far-and-pin-bar-constructs
#13
Augusta Whitney Kluk, Tina Zhang, Joseph P Russell, Hyunchul Kim, Adam H Hsieh, Robert V O'Toole
Orthopedic dogma states that external fixator stiffness is improved by placing 1 pin close to the fracture and 1 as distant as possible ("near-far"). This fixator construct is thought to be less expensive than placing pins a shorter distance apart and using "pin-bar" clamps that attach pins to outriggers. The authors therefore hypothesized that the near-far construct is stiffer and less expensive. They compared mechanical stiffness and costs of near-far and pin-bar constructs commonly used for temporary external fixation of femoral shaft fractures...
October 13, 2016: Orthopedics
https://www.readbyqxmd.com/read/27681857/biomechanical-analysis-of-the-individual-ligament-contributions-to-syndesmotic-stability
#14
Thomas O Clanton, Brady T Williams, Jonathon D Backus, Grant J Dornan, Daniel J Liechti, Scott R Whitlow, Adriana J Saroki, Travis Lee Turnbull, Robert F LaPrade
BACKGROUND: Biomechanical data and contributions to ankle joint stability have been previously reported for the individual distal tibiofibular ligaments. These results have not yet been validated based on recent anatomic descriptions or using current biomechanical testing devices. METHODS: Eight matched-pair, lower leg specimens were tested using a dynamic, biaxial testing machine. The proximal tibiofibular joint and the medial and lateral ankle ligaments were left intact...
January 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/27672016/biomechanical-comparison-of-3-current-ankle-syndesmosis-repair-techniques
#15
Thomas O Clanton, Scott R Whitlow, Brady T Williams, Daniel J Liechti, Jonathon D Backus, Grant J Dornan, Adriana J Saroki, Travis Lee Turnbull, Robert F LaPrade
BACKGROUND: Significant debate exists regarding optimal repair for unstable syndesmosis injuries. Techniques range from screw fixation, suture-button fixation, or a combination of the two. In this study, 3 common repairs were compared using a simulated weightbearing protocol with internal and external rotation of the foot. METHODS: Twenty-four lower leg specimens with mean age 54 years (range, 38-68 years) were used for testing. Following creation of a complete syndesmotic injury (AITFL, ITFL, PITFL, interosseous membrane), specimens were repaired using 1 of 3 randomly assigned techniques: (1) one 3...
February 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/27637854/biomechanical-comparison-of-graft-structures-in-anterior-cruciate-ligament-reconstruction
#16
Breck R Lord, Hadi El-Daou, Bhushan M Sabnis, Chinmay M Gupte, Adrian M Wilson, Andrew A Amis
PURPOSE: Double-bundle (DB) anterior cruciate ligament (ACL) reconstruction may offer kinematic restoration superior to anatomic single bundle (SB), but it remains technically challenging. The femoral attachment site has the most effect on ACL graft isometry, so a simplified three-socket (3S) construct which still uses two sockets to cover the femoral ACL attachment is attractive. It was hypothesised that ACL reconstruction using three- and four-socket techniques would more closely restore native knee kinematics compared to anatomic two-socket (SB) surgery...
September 16, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27628500/a-biomechanical-comparison-study-of-a-modern-fibular-nail-and-distal-fibular-locking-plate-in-ao-ota-44c2-ankle-fractures
#17
Paul J Switaj, Daniel Fuchs, Mohammed Alshouli, Avinash G Patwardhan, Leonard I Voronov, Muturi Muriuki, Robert M Havey, Anish R Kadakia
BACKGROUND: A lateral approach with open reduction and internal fixation with a plate is a very effective technique for the majority of distal fibular fractures. However, this open approach for ankle fixation may be complicated by wound dehiscence and infection, especially in high-risk patients. An alternative to plating is an intramedullary implant, which allows maintenance of length, alignment, and rotation and which allows for decreased soft tissue dissection. While there has been clinical data suggesting favorable short-term outcomes with these implants, there is no current biomechanical literature investigating this technology in this particular fracture pattern...
September 15, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27528850/a-biomechanical-comparison-of-pin-configurations-used-for-percutaneous-pinning-of-distal-tibia-fractures-in-children
#18
Justin Brantley, Aditi Majumdar, J Taylor Jobe, Antony Kallur, Christina Salas
BACKGROUND: Percutaneous pin fixation is often used in conjunction with closed-reduction and cast immobilization to treat pediatric distal tibia fractures. The goal of this procedure is to maintain reduction and provide improved stabilization, in effort to facilitate a more anatomic union. We conducted a biomechanical study of the torsional and bending stability of three commonly used pin configurations in distal tibia fracture fixation. METHODS: A transverse fracture was simulated at the metaphyseal/diaphyseal junction in 15 synthetic tibias...
2016: Iowa Orthopaedic Journal
https://www.readbyqxmd.com/read/27411276/-healing-model-research-of-rotator-cuff-injury-in-canine
#19
Wei Ye, Nirong Bao, Jianning Zhaq
OBJECTIVE: To compare the difference of rotator cuff healing between different types of injury andbetween different repair methods, and to explore the animal model to accurately simulate the restorative process afterrepair of rotator cuff injury. METHODS: Twelve adult male beagle dogs (weighing, 10-15 kg) were divided into 3 groups (n = 4) according to different processing methods: acute rotator cuff injury+Mason-Allen suture repair (group A), huge rotator cuff injury+Mason-Allen suture repair (group B), and huge rotator cuff injury+Mason-Allen combined with autogenous semitendinosus expansion suture repair (group C)...
April 2016: Chinese Journal of Reparative and Reconstructive Surgery
https://www.readbyqxmd.com/read/27302535/virtual-stress-testing-of-fracture-stability-in-soldiers-with-severely-comminuted-tibial-fractures
#20
Joseph L Petfield, Garry T Hayeck, David L Kopperdahl, Leon J Nesti, Tony M Keaveny, Joseph R Hsu
Virtual stress testing provides a non-invasive estimate of the strength of a healing bone through a biomechanical analysis of a patient's computed tomography (CT) scan. We asked whether virtual stress testing could improve management of patients who had a tibia fracture treated with external fixation. In a retrospective case-control study of 65 soldier-patients who had tibia fractures treated with an external fixator, we performed virtual stress testing utilizing CT scans acquired prior to fixator removal. The strength of the healing bone and the amount of tissue damage after application of an overload were computed for various virtual loading cases...
June 15, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
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