Investigation on the distal screw of a trochanteric intramedullary implant (Fi-nail) using a simplified finite element model

Efstathopoulos, Nicolas; Nikolaou, Vassilios S.; Xypnitos, F.N.; Korres, Demitrios; Lazarettos, Ioannis; Panousis, Kostas; Kasselouris, Evangelos N.; Venetsanos, Demetrios T.; Provatidis, Christopher G.

doi:10.1016/j.injury.2009.09.006

Cited by 12 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The violin is a well-known stringed musical instrument and has been studied experimentally via modal analysis [1] and holographic [2] methods, as well as via numerical modelling and simulations, especially via the finite element method [3][4][5][6]. The vibro-acoustic properties of the violin and the construction of the instrument are related to the top plate's vibrational modes in a direct way [7].…”

Section: Introductionmentioning

confidence: 99%

Vibro-acoustics time domain FEM-BEM analysis of a Titian Stradivari violin: the role of the bridge

Kaselouris

Dimitriou²

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The acoustic behaviour of the violin is defined during manufacturing since the vibrational acoustic properties of the instrument are related to the top plate’s vibrational modes in a direct way. An important component of the violin assembly is the bridge. The bridge transfers the excitation forces from the strings to the soundboard via the bridge feet and acts as a sound filter. In this study the Titian Stradivari violin CAD geometry of the soundboard, including the f-holes and bass bar, and the bridge is modelled, and time domain coupled finite element method-boundary element method, vibro-acoustic, simulations are performed to analyse the interference of the instrument’s sound with its structural components. A comparison of the vibroacoustic behaviour for the soundboard with and without the bridge enlightens the crucial role of the bridge. This initial computational approach will be extended, with similar studies on the role of every structural component of the violin individually, aiming to decode the full violin soundbox vibroacoustic behaviour and provide key insights for violinmakers on how structural changes affect the quality of the emitted sound.

show abstract

Section: Introductionmentioning

confidence: 99%

Vibro-acoustics time domain FEM-BEM analysis of a Titian Stradivari violin: the role of the bridge

Kaselouris

Dimitriou²

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…In the treatment of trochanteric fractures (TF), stable fixation is mandatory to achieve a safe and early mobilization, because it is important for patients to return to their previous activity level (1,2). Although choice of the implant varies according to the type of TFs, many studies report that unstable pertrochanteric fractures of the femur, i.e.…”

Section: Introductionmentioning

confidence: 99%

Düz Proksimal Femur Çivileri Femurun Anterior Eğimi ile Uyumsuzdur

Yıldız¹,

Güzel²,

Erden³

et al. 2019

bs.

View full text Add to dashboard Cite

Objective: Increased anterior bow of the femur due to advanced age and osteoporosis impinges with the distal part of the non-anatomic, standard proximal femoral nails (PFN), which is one of the most preferred implant for the fixation of trochanteric fractures (TF) in the elderly. The relation between increased femoral bowing and standard PFN application was investigated.Methods: Radiographs of 111 patients (59 men, 52 women; mean age 74.5 years), who were treated with PFN due to TF between 2011 and 2015, were evaluated retrospectively. Relation between the nail and the anterior cortex was determined by measuring the angle between distal anatomical axes of the nail and the femur (ADA). The patients were divided into two groups according to their ADA (group 1 ADA ≤4° and group 2 ADA >4°). Functional results and pain was evaluated using Harris Hip Score (HHS) and visual analog scale (VAS). Complications were also recorded. Results:The mean amount of ADA was 4.5°±1.5°. Forty-seven patients were classified in group 1 and 64 patients were in group 2. The mean HHSs were 80.6 and 79.3 (p=0.464), and the mean VAS scores were 2.13 and 5.35 (p<0.001) in group 1 and 2, respectively. Five patients were revised due to cut-out of the lag screws (total hip arthroplasty in two patients and revision of the nails in three patients). Union was achieved in all patients without infection. Conclusion:Because straight femoral nails impinges anterior cortex of the femur with increased bowing, new design PFN with anterior curve is needed especially for shorter or osteoporotic people, or Caucasian population.

show abstract

“…In fact, locking screws are stress concentrators which may lead to screw or nail breakage [6][7][8]. In addition, locking screws prevent load distribution between bone fragments, which negatively affect fracture healing and can lead to various complications [1].…”

Section: Introductionmentioning

confidence: 99%

Expandable intramedullary nail: review of biomechanical studies

Ivanov¹,

Anatoly²,

Yuri³

2016

Russ. Open Med. J.

View full text Add to dashboard Cite

Abstract:This article reviews studies of Fixion expandable nail biomechanical properties in case of long bones fractures osteosynthesis. The purpose of this study was to systematize biomechanical researches dedicated to the expandable nail. There were found seven biomechanical studies published between 2005 and 2008. Among them, six studies are devoted to mechanical experiments, and one is a comment to the published study. In four papers, the authors compared biomechanical properties of expandable and locked nails. Expandable nail proved to be a highly effective device for fixation of long bone fractures. However, in case of mid-shaft fractures Fixion nail was significantly less stable than standard locked nails. This conclusion was obtained for humeri, tibia and femur. Stiffness of bone-implant system for expandable nail in case of torsional loads was significantly lower than the similar parameter of standard implant in case of transverse fracture models. Expandable Fixion nail rod should be used with great caution for osteosynthesis of long bones transverse shaft fractures. In contrast, in the case of oblique and spiral fractures, when contact area between fragments is sufficiently high and can share loads between nail and bone fragments, the expandable nail should be used.

show abstract

Investigation on the distal screw of a trochanteric intramedullary implant (Fi-nail) using a simplified finite element model

Cited by 12 publications

References 35 publications

Vibro-acoustics time domain FEM-BEM analysis of a Titian Stradivari violin: the role of the bridge

Vibro-acoustics time domain FEM-BEM analysis of a Titian Stradivari violin: the role of the bridge

Düz Proksimal Femur Çivileri Femurun Anterior Eğimi ile Uyumsuzdur

Expandable intramedullary nail: review of biomechanical studies

Contact Info

Product

Resources

About