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Proceedings ArticleDOI

Design of an artificial high flexion knee

S. Sudesh1, L. Mathew1
10 Dec 2007-pp 112-115
TL;DR: This research is aimed to design an artificial knee for Indian conditions, which emphasizes the high flexion-extension range of over 125 which would provide the comfort of squatting even after the total knee replacement [TKR].
Abstract: The total knee arthroplasty is the end stage surgical procedure for pain relief in degenerative diseases like arthritis. There are many models, which had been designed so far in 5 to 6 decades of arthroplasty history. This research is aimed to design an artificial knee for Indian conditions, which emphasizes the high flexion-extension range of over 125 which would provide the comfort of squatting even after the total knee replacement [TKR]. The research also aims in designing a cost effective knee implant which would also suit the Indian economic conditions.
Citations
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Journal ArticleDOI
TL;DR: A new design allowing a flexion extension range of over 120 degrees was designed and is used for analysis and the results obtained were very satisfactory and based on these results the models have been recommended for prototyping.
Abstract: The application of finite-element modelling in medical applications has been evolving as a field of high importance in recent times. Total knee arthroplasty TKA has been in existence for over 6 decades. The generic artificial knee implants used in the TKA have a restricted range of motion of around 90 degrees. A new design allowing a flexion extension range of over 120 degrees was designed and is used for analysis. Loading conditions of 10 times the body weight are considered. The finite-element analyses of the designs were carried out based on standard biomaterials used in orthopaedic implants. The results of the analyses were used in identifying areas of extreme stress within the design and the spots prone to higher deformation. On the basis of these results slight modification of the designs was carried out. The results are also verified whether the body is within the linear deformation levels. The results obtained were very satisfactory and based on these results the models have been recommended for prototyping.

8 citations


Cites background from "Design of an artificial high flexio..."

  • ...(Sivarasu and Mathew 2007)....

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  • ...Maximum load 10 × Body weight Average body weight 70 Kg (Sivarasu and Mathew, 2007) Maximum load 70 × 10 = 700 Kg Maximum load on single knee 700 Kg (considering the patient standing in single leg)...

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Journal Article
TL;DR: The finite element analyses of the designs were carried out based on standard biomaterial used in orthopaedic implants and the results obtained were very satisfactory the models have been recommended for prototyping.
Abstract: The application of Finite Element Modelling in Medical Applications has been evolving as the field of high importance especially in the development of medical devices. The Total Knee Arthroplasty [TKA] has been in existence for over 6 decades till now. The generic artificial knee implants used in the TKA have the restriction in its range of motion with around 90 degrees. A new design allowing flexion extension range of over 120 degrees was designed with a view to facilitate partial squatting and the same is used for the analysis purpose. The loading conditions of 10 times the body weight are considered. The finite element analyses of the designs were carried out based on standard biomaterial used in orthopaedic implants. In this paper we have discussed the results of analyses of an artificial knee with Ti alloy. The results of the analyses were used in identifying areas of extreme stresses within the design and the spot prone for higher deformation. Based on these results slight modification on the designs was carried out. The results are also verified whether the body is within the linear deformation levels. As the results obtained were very satisfactory the models have been recommended for prototyping.

6 citations

Journal ArticleDOI
TL;DR: The parameters that affect activity levels after total knee replacement are discussed, and the aspects of a novel knee design that allow normal high flexion activity even after total knees replacement are described.
Abstract: Total knee arthroplasty is a surgical procedure that is commonly used for pain relief and movement restoration in cases of severe arthritis The knee implant design plays a vital role in determining patients' activity levels after total knee replacement Of the 90 percent of younger patients who undergo knee replacement surgeries, restriction is caused by the implant design This article discusses the parameters that affect activity levels after total knee replacement, and describes the aspects of a novel knee design that allow normal high flexion activity even after total knee replacement

3 citations

Journal ArticleDOI
TL;DR: The design aspects of a novel knee design that allows the normal high flexion activity even after TKR are briefs and the models have been recommended for prototyping.
Abstract: Total knee arthroplasty (TKA) has been the end-time surgical procedure for pain relief and movement restoration in cases of severe arthritis. The knee implant design plays a vital role in deciding the activity levels of a patient after total knee replacement (TKR). In about 90% of younger patients undergoing the knee replacement surgeries, the restriction is not from the subject but from the implant design. This paper discusses parameters affecting the activity levels after TKR. It also briefs the design aspects of a novel knee design that allows the normal high flexion activity even after TKR. The application of finite element modeling in medical applications has been evolving as the field of high importance especially in the development of medical devices. The TKA has been in existence for over six decades till now. The generic artificial knee implants used in the TKA have the restriction in its range of motion of about 90°. A new design allowing flexion extension range of over 120° was designed with a view to facilitate partial squatting and the same is used for the analysis purpose. The loading conditions of 10 times the body weight are considered. The finite element analyses of the designs were carried out based on standard biomaterial used in orthopedic implants. In this paper, we have discussed the results of analyses of an artificial knee with titanium (Ti) alloy. The results of the analyses were used in identifying areas of extreme stresses within the design and the spot prone for higher deformation. Based on these results, slight modification on the designs was carried out. The results are also verified whether the body is within the linear deformation levels. As the results obtained were very satisfactory, the models have been recommended for prototyping.

2 citations

Book ChapterDOI
S. Sivarasu1, L. Mathew1
01 Jan 2009
TL;DR: The emphasize for customized joint design for the eastern world has be in the discussion for a while now, mainly owing to the economic growth surrounding the eastern countries like China and India.
Abstract: Total Knee Arthroplasty has been an end term surgical procedure for pain relief and movement restoration in knee joint with Arthritis. The procedure has been followed for more than 5 decades. The performance of the joint after the procedure is dependent on the implant design. The emphasize for customized joint design for the eastern world has be in the discussion for a while now, mainly owing to the economic growth surrounding the eastern countries like China and India. Also the arthritis estimates show that the probable increase in the procedure numbers in the coming years.

1 citations

References
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Journal ArticleDOI
TL;DR: This paper is an effort to identify the innovators who contributed to the development of today's condylar total knee prostheses and the surgical techniques used to insert them.
Abstract: The 1970s saw an explosion of ideas in the field of prosthetic knee arthroplasty. This paper is an effort to identify the innovators who contributed to the development of today's condylar total knee prostheses and the surgical techniques used to insert them. The 1970s were selected because most innovations occurred during those years. Two different design approaches were undertaken simultaneously. One was a functional approach whereas the other was a strictly anatomical approach. Initially, these 2 approaches led to very different designs. But the common goal of recreating human knee function eventually led to more similarities than differences. The author describes how, when, and why these dedicated individuals came to their ideas. The work is largely based on interviews and correspondence with those involved as well as on reviews of patents and papers pertaining to their work.

109 citations