Biomechanical Analysis of Two Types of Osseointegrated Transfemoral Prosthesis

Mirulla, Agostino Igor; Paolo, Stefano Di; Simone, Francesco Di; Ingrassia, Tommaso; Nigrelli, Vincenzo; Zaffagnini, Stefano; Bragonzoni, Laura

doi:10.3390/app10228263

Cited by 8 publications

(5 citation statements)

References 59 publications

(81 reference statements)

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“…As reported in the literature [ 4 , 24 ], custom specific knee finite element models (FEM) has recently been developed, both in clinical applications and in the process of medical devices design [ 13 , 23 ], to investigate native and replaced knee joint kinematics and kinetics [ 6 , 15 , 18 ]. These models represent a valid alternative to in-vivo or experimental assessments since they were able to provide results comparable to those two methods while maintaining lower cost in comparison [ 2 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of paradoxical anterior translation in a CR total knee prosthesis coupling dynamic RSA and FE techniques

et al. 2021

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Purpose The study aims were to assess the kinematic data, Internal-External (IE) rotation, and Antero-Posterior (AP) translation of the contact points between the femoral condyles and polyethylene insert and to develop a combined dynamic RSA-FE (Radiostereometric – Finite Element) model that gives results congruent with the literature. Methods A cohort of 15 patients who underwent cemented cruciate-retaining highly congruent mobile-bearing total knee arthroplasty were analyzed during a sit-to-stand motor task. The kinematical data from Dynamic RSA were used as input for a patient-specific FE model to calculate condylar contact points between the femoral component and polyethylene insert. Results The femoral component showed an overall range about 4 mm of AP translation during the whole motor task, and the majority of the movement was after 40° of flexion. Concerning the IE rotation, the femoral component started from an externally rotate position (− 6.7 ± 10°) at 80° of flexion and performed an internal rotation during the entire motor task. The overall range of the IE rotation was 8.2°. Conclusions During the sit to stand, a slight anterior translation from 40° to 0° of flexion of the femoral component with respect to polyethylene insert, which could represent a paradoxical anterior translation. Despite a paradoxical anterior femoral translation was detected, the implants were found to be stable. Dynamic RSA and FE combined technique could provide information about prosthetic component’s stress and strain distribution and the influence of the different designs during the movement.

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Section: Introductionmentioning

confidence: 99%

Assessment of paradoxical anterior translation in a CR total knee prosthesis coupling dynamic RSA and FE techniques

et al. 2021

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“…Young's modulus (GPa) Poisson's Ratio Cortical bone 17.6 0.3 Spongy bone 13 0.36 Titanium alloy 110 0.33 An appropriate contact model that can represent the implant boundary conditions is important for the accuracy of the finite element (FE) analysis. For the OPL and ILP implants, friction is the main mechanism for connecting bone and implants after the first surgery, whereas bonded contact is commonly used in many FE simulations [1,8,9,16,29]. There is no sliding and separation of the contact elements in bonded contact.…”

Section: Methodsmentioning

confidence: 99%

“…A two-stage surgical protocol and rehabilitation plan can help patients gain implant stability gradually [16]. In the first stage, the implant will be hammered into the bone remnant and the wound is closed using a stump pressure bandage.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the bone degradation-induced loosening of osseointegrated percutaneous implant using vibration analysis

Zhou

2023

Materials Research Proceedings

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Abstract. Osseointegrated implants attach prosthetic devices directly to the skeletal system with a stable connection, allowing amputees to control prostheses with good proprioception. However, periprosthetic cortical thinning can occur if the remaining bone is stress shielded after implantation, resulting in aseptic implant loosening, and requiring revision surgery. It is therefore important to quantitatively monitor the degree of bone loss and probability of loosening to provide evidence for doctors to plan treatment. This computational study investigates the vibration behavior of a bone-implant construct by monitoring its transient response over varying degrees of bone degradation. The thickness of distal bone is progressively reduced through a revolving material removal to simulate cortical thinning due to stress shielding. First, bonded contact is adopted to represent the case of the fully osseointegrated implant under bone resorption, leading to a linear vibrational response. Next, frictional contact with 0.05 mm over-fit offset is adopted to include the non-linear contact behavior when loosening is induced by cortical thinning. The torsional mode shape of the bone-implant construct is identified through cross-spectrum analysis. The results suggest that the change in the natural frequency of the first torsional mode provides the most sensitive indicator of cortical thinning and implant loosening. The findings underpin the potential of vibration analysis in the monitoring of bone degradation-induced implant looseness.

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“…Therefore, numerical simulation of the in vivo biomechanical responses by using finite element analysis (FEA) becomes a more effective approach [ 21 - 23 ] . FEA can provide the mechanical responses of bone tissue [ 24 - 26 ] and prostheses [ 27 - 30 ] under various mechanical environments, which in turn is valuable to guide the design and fabrication of prostheses. Despite the wide applications of FEA, few studies were reported on its application in the clinical design of patient-specific 3D-printed porous tantalum prostheses, especially in the evaluation of the designed prostheses from the viewpoint of bone biomechanics.…”

Section: Introductionmentioning

confidence: 99%

Design and biomechanical analysis of patient-specific porous tantalum prostheses for knee joint revision surgery

Mao¹,

Yang²,

Wang³

et al. 2024

IJB

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Artificial joint revision surgery, as an increasingly common surgery in orthopedics, often requires patient-specific prostheses to repair the bone defect. Porous tantalum is a good candidate due to its excellent abrasion and corrosion resistance and good osteointegration. Combination of 3D printing technology and numerical simulation is a promising strategy to design and prepare patient-specific porous prostheses. However, clinical design cases have rarely been reported, especially from the viewpoint of biomechanical matching with the patient’s weight and motion and specific bone tissue. This work reports a clinical case on the design and mechanical analysis of 3D-printed porous tantalum prostheses for the knee revision of an 84-year-old male patient. Particularly, standard cylinders of 3D-printed porous tantalum with different pore size and wire diameters were first fabricated and their compressive mechanical properties were measured for following numerical simulation. Subsequently, patient-specific finite element models for the knee prosthesis and the tibia were constructed from the patient’s computed tomography data. The maximum von Mises stress and displacement of the prostheses and tibia and the maximum compressive strain of the tibia were numerically simulated under two loading conditions by using finite element analysis software ABAQUS. Finally, by comparing the simulated data to the biomechanical requirements for the prosthesis and the tibia, a patient-specific porous tantalum knee joint prosthesis with a pore diameter of 600 μm and a wire diameter of 900 μm was determined. The Young’s modulus (5719.32 ± 100.61 MPa) and yield strength (172.71 ± 1.67 MPa) of the prosthesis can produce both sufficient mechanical support and biomechanical stimulation to the tibia. This work provides a useful guidance for designing and evaluating a patient-specific porous tantalum prosthesis.

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Biomechanical Analysis of Two Types of Osseointegrated Transfemoral Prosthesis

Cited by 8 publications

References 59 publications

Assessment of paradoxical anterior translation in a CR total knee prosthesis coupling dynamic RSA and FE techniques

Assessment of paradoxical anterior translation in a CR total knee prosthesis coupling dynamic RSA and FE techniques

Monitoring the bone degradation-induced loosening of osseointegrated percutaneous implant using vibration analysis

Design and biomechanical analysis of patient-specific porous tantalum prostheses for knee joint revision surgery

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