Geometric Modelling and Multi-Axis NC Machining for the Femoral Component of Knee Prosthesis

Lee, Jeng-Nan; Chen, Hung-Shyong; Luo, Chih-Wen; Tsai, Yaw-Bin; Huang, Chao-Jen

doi:10.1166/asl.2012.2482

Cited by 3 publications

(3 citation statements)

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“…More recently, Harrysson et al [20] proposed a new design method for knee implants, based on patient-specific Computed Tomography (CT) data which can provide among other, more accurate replication of the actual geometries of knee components and the reduced possibility of implant loosening. Lee et al [21] also employed CT data in order to design the femoral component and afterwards, they created femoral components using rapid prototyping and Computer Numerical Control (CNC) machining methods. Finally, Song et al [22] presented a thorough work related to the rapid manufacturing of femoral component using Selective Laser Melting (SLM) method which can provide a reliable way to produce customized implants.…”

Section: Introductionmentioning

confidence: 99%

Precision CNC Machining of Femoral Component of Knee Implant: A Case Study

et al. 2018

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Abstract:The design and manufacturing of medical implants constitutes an active and highly important field of research, both from a medical and an engineering point of view. From an engineering aspect, the machining of implants is undoubtedly challenging due to the complex shape of the implants and the associated restrictive geometrical and dimensional requirements. Furthermore, it is crucial to ensure that the surface integrity of the implant is not severely affected, in order for the implant to be durable and wear resistant. In the present work, the methodology of designing and machining the femoral component of total knee replacement using a 3-axis Computer Numerical Control (CNC) machine is presented, and then, the results of the machining process, as well as the evaluation of implant surface quality are discussed in detail. At first, a preliminary design of the components of the knee implant is performed and the planning for the production of the femoral component is implemented in Computed Aided Manufacturing (CAM) software. Then, three femoral components are machined under different process conditions and the surface quality is evaluated in terms of surface roughness. Analysis of the results indicated the appropriate process conditions for each part of the implant surface and led to the determination of optimum machining strategy for the finishing stage.

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Section: Introductionmentioning

confidence: 99%

Precision CNC Machining of Femoral Component of Knee Implant: A Case Study

et al. 2018

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“…Gibson et al [3] did some case studies on the applications of RP technology in medicine. Jeng-Nan lee et al [4] studied the application of Rapid Prototyping technology and multi axis machining for fabrication of femoral component of the knee prosthesis. Juan Felipe et al [5] designed and manufactured a skull implant by Titanium alloy.Milan et al [1] studied on the production of medical implants by using rapid prototyping technology and investment casting technology.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Knee Joint

2014

IJRA

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Knee joint is an important part of human body. Failure of knee joint may occur mainly because of surface to surface contact of femoral and tibial surfaces owing to the dry out of bursae fluid. The damaged surfaces must be replaced by artificial implants made of metals, ceramics, or composite materials. This process is known as total knee replacement. The failure of bearing component in knee implant is due to high stresses at the contact regions of femoral component and polyethylene insert causes wear and decreases the life of the implant. The stiffness of artificial implants is around 110 GPa to 210 GPa, while that of the human bone is around 17 GPa. This increases the stress shielding effect. To reduce stress shielding effect an implant material should have the stiffness value nearer to human bone. This reduces the effect of stress shielding between the bone and implant.

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“…Cemented prosthesis is held in place by cement for fixation, whereas no cemented prosthesis has a rough, porous surface intended for bone to grow into and attach the prosthesis to the bone. [4][5][6]. Major metallic alloys used for orthopedic prostheses include titanium alloys, cobalt-chromiummolybdenum alloys and stainless steels.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Machining Operations of a Femoral Prosthesis Using CAM Applications

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2013

KEM

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The studies of biomaterials machinability applied in the medical field are extensive, however many of these studies use models of regular geometry and use elementary machining operations. In this work, a femoral prosthesis with a complex geometric shape was experimental milled using two different commercial Computer Aided Manufacturing (CAM) applications. The toolpaths defined in both CAM applications were similar and carefully selected according with the femoral prosthesis geometry. Roughing, semi-finishing and finishing passes were applied in this work. The influence of toolpath strategy was studied and predicted results from software’s simulation were compared with milled part.

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Geometric Modelling and Multi-Axis NC Machining for the Femoral Component of Knee Prosthesis

Cited by 3 publications

References 0 publications

Precision CNC Machining of Femoral Component of Knee Implant: A Case Study

Precision CNC Machining of Femoral Component of Knee Implant: A Case Study

Analysis of Knee Joint

Analysis of Machining Operations of a Femoral Prosthesis Using CAM Applications

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