Stemmed TKA in a Femur With a Total Hip Arthroplasty

Soenen, M.; Baracchi, Matteo; Corte, Ronny De; Labey, Luc; Innocenti, Bernardo

doi:10.1016/j.arth.2013.01.010

Cited by 69 publications

(38 citation statements)

References 45 publications

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“…The comprehensive tibial component was then coupled to the corresponding femoral component considering an interaction friction coefficient of 0.1 to simulate the effect of synovial liquid. 8 A linear, elastic and isotropic material model was considered for all the materials used in this study [9][10][11] ; the material properties are detailed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Investigation on the Effects Induced by Tka Features on Tibio-Femoral Mechanics Part I: Femoral Component Designs

Innocenti

Yagüe

Bernabé

et al. 2015

J. Mech. Med. Biol.

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The lack of awareness of the exact number of instantaneous centers of knee flexion/extension rotation leads to the presence in the market of total knee arthroplasty (TKA) femoral components designed under different hypotheses. Although single radius (SR) designs are thought to replicate the physiological behavior in a more realistic way, surgeons do not always agree about the veracity of their theoretical advantages with respect to the multiple radii components (J-curve (JC) design). Apart from clinical studies, up to now, any literature study biomechanically and exhaustively compares these two TKA solutions, thus a finite element analysis (FEA) has been carried out. In particular, two models were defined to analyze the performance of a SR design and a JC design with the same tibial component during gait cycle and squat motor task. Tibio-femoral kinematics and kinetics have been investigated comparing the resulting contact area between components, internal-external (IE) rotation, position and magnitude of the center of total forces due to contact pressure and polyethylene von Misses stresses. Results demonstrate that, for low demanding tasks, there are no significant differences between the two designs, however, during the squat motor task, some changes in contact force and increases in polyethylene stress were identified for the SR solution.

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Section: Methodsmentioning

confidence: 99%

Investigation on the Effects Induced by Tka Features on Tibio-Femoral Mechanics Part I: Femoral Component Designs

Innocenti

Yagüe

Bernabé

et al. 2015

J. Mech. Med. Biol.

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“…of a left, fourth generation, composite tibia and femur, size medium. Such models are widely used for numerical and experimental tests [26,27]. Their geometries include cortical bone, cancellous bone, and intramedullary canal.…”

Section: Introductionmentioning

confidence: 99%

“…Material Models and Properties. According to previous studies and models [25][26][27][34][35][36], linear elasticity was used for all the material models considered in this study. This allows for a good approximation of all the involved materials in order to gain a qualitative comparison among different configurations.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Analysis of Augments in Revision Total Knee Arthroplasty

Innocenti

Fekete

Pianigiani

2018

Journal of Biomechanical Engineering

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Augments are a common solution for treating bone loss in revision total knee arthroplasty and industry is providing to surgeons several options, in terms of material, thickness and shapes. Actually, while the choice of the shape and the thickness is mainly dictated by the bone defect, no proper guidelines are currently available to select the optimal material for a specific clinical situation. Nevertheless, different materials could induce different bone responses and, later, potentially compromise implant stability and performances. Therefore, in this study, a biomechanical analysis is performed by means of finite element modelling about existing features for augment designs. Based upon a review of available products at present, the following augments features were analyzed: position (distal/proximal and posterior), thickness (5, 10 and 15 mm) and material (bone cement, porous and solid metal). For all analyzed configurations, bone stresses were investigated in different regions and compared among all configurations and the control model for which no augments were used. Results show that the use of any kind of augment usually induces a change in bone stresses, especially in the region close to the bone cut. The porous metal presents result very close to cement ones; thus it could be considered as a good alternative for defects of any size. Solid metal has the least satisfying results inducing the highest changes in bone stress. The results of this study demonstrate that material stiffness of the augment should be as close as possible to bone properties for allowing the best implant performances.

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“…Excessively small gaps pose a risk of femur fracture and development of minor resistant point in femur bone. Optimal gap should be at least 10 cm [26].…”

Section: Discussionmentioning

confidence: 99%

Straight versus modular nail: Analysis of mechanical properties two knee arthrodesis methods.

Białecki¹,

Para²,

Sobolewski³

et al. 2020

Preprint

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Background Complications after arthroplasty often result in irreversible disability. In some cases for the extremity to be salvaged, the permanent knee joint arthrodesis is the last-chance procedure. Modular implant design simplifies surgical technique but modularity may potentially compromise mechanical strength of an implant. Mechanical properties of the implant are particularly important in case of knee arthrodesis without bone-on-bone contact where forces during gait and weight bearing are transmitted directly through the nail. The aim of this article was to perform comparative analysis of the mechanical properties of modular nail CHARFIX2 FN, when compared to the femoral nail, used for knee arthrodesis; and to analyze the effectiveness of treatment with use of this nail based on the observations of clinical cases. Methods Comparative analysis of: the static 4-point bending test, dynamic 4-point bending test and static torsion test. All tests were performed in accordance with requirements of ASTM F 1264. A clinical analysis of 5 cases, in which CHARFIX2 FN nails were used, was also performed. Results Based on the results of mechanical tests, the strength characteristics of CHARFIX2 FN nail have been found superior and more advantageous than corresponding features of the standard femoral nail. For CHARFIX2 FN nail, the median for flexural stiffness was almost 4 times higher and for maximum torque value was almost 2 times higher when compared to the femoral nail. Observations of the clinical cases gave satisfactory results. Conclusions The obtained mechanical tests present significant differences between CHARFIX2 FN and the femoral nail in mechanical strength and, therefore, its improved stability and safety for patients during walking. It can be used for permanent knee immobilization with satisfactory clinical results. The functional outcomes and subjective measurements of pain in patients treated with CHARFIX2 FN group are satisfying.

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Stemmed TKA in a Femur With a Total Hip Arthroplasty

Cited by 69 publications

References 45 publications

Investigation on the Effects Induced by Tka Features on Tibio-Femoral Mechanics Part I: Femoral Component Designs

Investigation on the Effects Induced by Tka Features on Tibio-Femoral Mechanics Part I: Femoral Component Designs

Biomechanical Analysis of Augments in Revision Total Knee Arthroplasty

Straight versus modular nail: Analysis of mechanical properties two knee arthrodesis methods.

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