The Experts below are selected from a list of 6558 Experts worldwide ranked by ideXlab platform
S. Ashfaq Hasan - One of the best experts on this subject based on the ideXlab platform.
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Os acromiale fixation: a biomechanical comparison of polyethylene suture versus stainless steel Wire Tension band.
Journal of shoulder and elbow surgery, 2016Co-Authors: Brian Shiu, Xuyang Song, Abigail Iacangelo, Hyunchul Kim, Ehsan Jazini, R. Frank Henn, Mohit N. Gilotra, S. Ashfaq HasanAbstract:Background Symptomatic hardware is a commonly reported complication after surgical fixation of an unstable meso-type os acromiale. This study compared the biomechanical properties of a cannulated screw Tension band construct using a metal Wire Tension band vs. a suture Tension band, considering that the suture construct could allow for decreased hardware burden in the clinical setting. Methods A meso-type os acromiale was created in 16 cadaveric shoulders. Two cannulated 4-mm screws were placed in each specimen. Tension band augmentation was accomplished with a 1-mm stainless steel Wire (Wire group) or a #5 braided polyethylene suture (suture group), with 8 specimens in each group. An inferiorly directed force was applied to the anterior acromion at 1 mm/s on a materials testing machine. Stiffness and ultimate failure load were recorded and analyzed. Results No significant difference ( P = .22) was observed in the ultimate failure load between the Wire (228 ± 85 N; range, 114-397 N) and the suture (275 ± 139 N; range, 112–530 N). No significant difference ( P = .17) was observed in the stiffness between the Wire (28 ± 12 N/mm; range, 18–53 N/mm) and the suture (38 ± 25 N/mm; range, 10–83 N/mm). Conclusions Stainless steel Wire and polyethylene suture have similar biomechanical strength in the cannulated screw Tension band fixation of meso-type os acromiale at time zero.
Brian Shiu - One of the best experts on this subject based on the ideXlab platform.
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Os acromiale fixation: a biomechanical comparison of polyethylene suture versus stainless steel Wire Tension band.
Journal of shoulder and elbow surgery, 2016Co-Authors: Brian Shiu, Xuyang Song, Abigail Iacangelo, Hyunchul Kim, Ehsan Jazini, R. Frank Henn, Mohit N. Gilotra, S. Ashfaq HasanAbstract:Background Symptomatic hardware is a commonly reported complication after surgical fixation of an unstable meso-type os acromiale. This study compared the biomechanical properties of a cannulated screw Tension band construct using a metal Wire Tension band vs. a suture Tension band, considering that the suture construct could allow for decreased hardware burden in the clinical setting. Methods A meso-type os acromiale was created in 16 cadaveric shoulders. Two cannulated 4-mm screws were placed in each specimen. Tension band augmentation was accomplished with a 1-mm stainless steel Wire (Wire group) or a #5 braided polyethylene suture (suture group), with 8 specimens in each group. An inferiorly directed force was applied to the anterior acromion at 1 mm/s on a materials testing machine. Stiffness and ultimate failure load were recorded and analyzed. Results No significant difference ( P = .22) was observed in the ultimate failure load between the Wire (228 ± 85 N; range, 114-397 N) and the suture (275 ± 139 N; range, 112–530 N). No significant difference ( P = .17) was observed in the stiffness between the Wire (28 ± 12 N/mm; range, 18–53 N/mm) and the suture (38 ± 25 N/mm; range, 10–83 N/mm). Conclusions Stainless steel Wire and polyethylene suture have similar biomechanical strength in the cannulated screw Tension band fixation of meso-type os acromiale at time zero.
Pin-hsum Huang - One of the best experts on this subject based on the ideXlab platform.
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Accuracy improvement of Wire-EDM by real-time Wire Tension control
International Journal of Machine Tools & Manufacture, 2004Co-Authors: Mu-tian Yan, Pin-hsum HuangAbstract:Abstract In this paper, a closed-loop Wire Tension control system for a Wire-EDM machine is presented to improve the machining accuracy. Dynamic models of the Wire feed control apparatus and Wire Tension control apparatus are derived to analyze and design the control system. PI controller and one-step-ahead adaptive controller are employed to investigate the dynamic performance of the closed-loop Wire Tension control system. In order to reduce the vibration of Wire Tension during Wire feeding, dynamic absorbers are added to the idle rollers of Wire transportation mechanism. Experimental results not only demonstrate that the developed control system with dynamic absorbers can obtain fast transient response and small steady-state error than an open-loop control system, they also indicate that the geometrical contour error of corner cutting is reduced with approximately 50% and the vertical straightness of a workpiece can be improved significantly.
Olav A. Foss - One of the best experts on this subject based on the ideXlab platform.
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Reduction in Wire Tension caused by dynamic loading. An experimental Ilizarov frame study
Journal of biomechanics, 2011Co-Authors: Valentina La Russa, Bjørn Skallerud, Jomar Klaksvik, Olav A. FossAbstract:Abstract Small diameter transosseous Wires are main parts of the Ilizarov frame concept. Wire Tensioning is essential to gain the necessary transversal stiffness, and the Wire fixators are therefore important, coupling the Wire to the ring. The ability of three different Wire fixator designs to maintain Wire Tension under dynamic loading is described. The three fixator designs were combinations of two types of bolts and one washer. In a simplified frame set-up consisting of one ring and one Wire, sixty Wires were dynamically loaded in sequence with 200 N for 450 times and Wire Tension was repeatedly measured. The Tension loss employing the different fixator types at two Wire preTension levels (883 N, 1275 N) was measured. Wire slippage in the fixators and the midpoint deflection angle of the Wires were measured. Large differences in fixation ability were observed. Wire fixators holding a larger and rougher contact surface had significant smaller Tension loss compared to fixators with a smaller and smother contact surface. Both plastic Wire deformation and slippage causes Tension loss with slippage as the main contributor. Wire fixators' design can be improved in order to maintain Wire Tension. Such improvement could be of clinical interest enhancing the mechanical stability of the fixator.
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Reduction in Wire Tension caused by Wire clamping and Wire Tensioner removal: an experimental Ilizarov frame study.
Proceedings of the Institution of Mechanical Engineers. Part H Journal of engineering in medicine, 2011Co-Authors: Valentina La Russa, Bjørn Skallerud, Jomar Klaksvik, Olav A. FossAbstract:The stability of an external ring fixator mainly depends on Wire Tension. Wire fixators should maintain the Tension during both Wire clamping to the ring and removal of the Tensioner device. In the present study the loss in Wire Tension related to fixator clamping and Wire Tensioner removal using three different Wire fixator designs was studied. The fixators were based on two different cannulated bolts and a washer. Effects from two different preTension levels in combination with three different bolt torque levels upon loss in Wire Tension were described. Emitted Wire vibration frequency was used to assess the corresponding Wire Tension. Wire Tension was determined after each Wire fixator tightening and after the removal of the Wire Tensioner. Increased bolt torque led to a small decrease in Tension for both preTension levels. A considerable higher Tension loss was measured when removing the Wire Tensioner. In all cases, the combination of a new cannulated bolt and a washer maintained the highest Tension.
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Wire Tension versus Wire frequency: An experimental Ilizarov frame study
Journal of biomechanics, 2010Co-Authors: Valentina La Russa, Bjørn Skallerud, Jomar Klaksvik, Olav A. FossAbstract:Abstract Stability of an Ilizarov frame highly depends on maintenance of adequate Tension in the Wires. Wire Tension should be measured accurately in experimental laboratory studies when new types of Wire fixators are tested. In this study, 20 Wires were tested using two different Wire fixators. The Wires were sequentially Tensioned from 0 to 1275 N in 50 N intervals. For each Tension value, corresponding vibration frequency was recorded. We then described the relationship between Wire Tension and Wire vibration frequency in an empirical equation (R2=99.8). Wire vibration frequency can also be described theoretically by the Euler–Bernoulli equation for a thin beam. Theoretical frequencies were calculated and compared with corresponding experimental frequencies. A close agreement was found (95% limits of agreement, ±3.2 Hz). This empirical equation represents a simple tool, applicable when investigating the effect of new Wire fixators, pre-Tensioning and frame constructions on Wire Tension.
Ehsan Jazini - One of the best experts on this subject based on the ideXlab platform.
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Os acromiale fixation: a biomechanical comparison of polyethylene suture versus stainless steel Wire Tension band.
Journal of shoulder and elbow surgery, 2016Co-Authors: Brian Shiu, Xuyang Song, Abigail Iacangelo, Hyunchul Kim, Ehsan Jazini, R. Frank Henn, Mohit N. Gilotra, S. Ashfaq HasanAbstract:Background Symptomatic hardware is a commonly reported complication after surgical fixation of an unstable meso-type os acromiale. This study compared the biomechanical properties of a cannulated screw Tension band construct using a metal Wire Tension band vs. a suture Tension band, considering that the suture construct could allow for decreased hardware burden in the clinical setting. Methods A meso-type os acromiale was created in 16 cadaveric shoulders. Two cannulated 4-mm screws were placed in each specimen. Tension band augmentation was accomplished with a 1-mm stainless steel Wire (Wire group) or a #5 braided polyethylene suture (suture group), with 8 specimens in each group. An inferiorly directed force was applied to the anterior acromion at 1 mm/s on a materials testing machine. Stiffness and ultimate failure load were recorded and analyzed. Results No significant difference ( P = .22) was observed in the ultimate failure load between the Wire (228 ± 85 N; range, 114-397 N) and the suture (275 ± 139 N; range, 112–530 N). No significant difference ( P = .17) was observed in the stiffness between the Wire (28 ± 12 N/mm; range, 18–53 N/mm) and the suture (38 ± 25 N/mm; range, 10–83 N/mm). Conclusions Stainless steel Wire and polyethylene suture have similar biomechanical strength in the cannulated screw Tension band fixation of meso-type os acromiale at time zero.
