e-Knee: Evolution of the Electronic Knee Prosthesis

M, Bâ; Dd, D'Lima; Slamin, John; Kovacevic, N; Sw, Arms; Cp, Townsend; Cw, Colwell

doi:10.2106/00004623-200100021-00013

Cited by 66 publications

(46 citation statements)

References 3 publications

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“…The impetus behind this study was the collection of in-vitro data concerning the most common failure mode of a TKR: lift-off of the tibia's lateral aspect. The work of Morris et al 2 was closely related to the study conducted by Kaufman with a few notable differences. The tibial tray used in the study conducted by Morris was instrumented with four load cells, which were placed in the four quadrants of the tibial tray.…”

Section: Introductionmentioning

confidence: 93%

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Embedded piezoelectrics for sensing and energy harvesting in total knee replacement units

2015

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The knee replacement is the second most common orthopedic surgical intervention in the United States, but currently only 1 in 5 knee replacement patients are satisfied with their level of pain reduction one year after surgery. It is imperative to make the process of knee replacement surgery more objective by developing a data driven approach to ligamentous balance, which increases implant life. In this work, piezoelectric materials are considered for both sensing and energy harvesting applications in total knee replacement implants. This work aims to embed piezoelectric material in the polyethylene bearing of a knee replacement unit to act as self-powered sensors that will aid in the alignment and balance of the knee replacement by providing intraoperative feedback to the surgeon. Postoperatively, the piezoelectric sensors can monitor the structural health of the implant in order to perceive potential problems before they become bothersome to the patient. Specifically, this work will present on the use of finite element modeling coupled with uniaxial compression testing to prove that piezoelectric stacks can be utilized to harvest sufficient energy to power sensors needed for this application.

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Section: Introductionmentioning

confidence: 93%

“…Intraoperative sensors are currently used in total knee replacements (TKR), but they must be removed after the data is collected during surgery [1][2][3] . There are some in-vivo sensors that use electromagnets as their power source.…”

Section: Introductionmentioning

confidence: 99%

Embedded piezoelectrics for sensing and energy harvesting in total knee replacement units

2015

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“…A few measurement systems aimed at providing a quantitative measurement of the ligament imbalance have been reported in the literature (Winemaker, 2002;Morris et al, 2001;Takahashi et al, 1997;Wallace et al, 1998;Attfield et al, 1994). However, they show various drawbacks such as a low accuracy, no realtime measurement, the necessity of a patellar eversion that may significantly modify the mediolateral force distribution or a stability assessment at the end of the surgery when the possibilities of correction are limited.…”

Section: Introductionmentioning

confidence: 99%

Ligament balancing in TKA: Evaluation of a force-sensing device and the influence of patellar eversion and ligament release

Crottet

Kowal

Sarfert

et al. 2007

Journal of Biomechanics

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Ligament balancing in total knee arthroplasty may have an important influence on joint stability and prosthesis lifetime. In order to provide quantitative information and assistance during ligament balancing, a device that intraoperatively measures knee joint forces and moments was developed. Its performance and surgical advantages were evaluated on six cadaver specimens mounted on a knee joint loading apparatus allowing unconstrained knee motion as well as compression and varus-valgus loading. Four different experiments were performed on each specimen. (1) Knee joints were axially loaded. Comparison between applied and measured compressive forces demonstrated the accuracy and reliability of in situ measurements (1.8 N). (2) Assessment of knee stability based on condyle contact forces or varus-valgus moments were compared to the current surgical method (difference of varus-valgus loads causing condyle lift-off). The force-based approach was equivalent to the surgical method while the moment-based, which is considered optimal, showed a tendency of lateral imbalance. (3) To estimate the importance of keeping the patella in its anatomical position during imbalance assessment, the effect of patellar eversion on the mediolateral distribution of tibiofemoral contact forces was measured. One fourth of the contact force induced by the patellar load was shifted to the lateral compartment. (4) The effect of minor and major medial collateral ligament releases was biomechanically quantified. On average, the medial contact force was reduced by 20% and 46%, respectively. Large variation among specimens reflected the difficulty of ligament release and the need for intraoperative force monitoring. This series of experiments thus demonstrated the device's potential to improve ligament balancing and survivorship of total knee arthroplasty.

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“…At present, in orthopedics in vivo microsystems do not go beyond measuring [5][6][7][8][9][10]. However the real challenge is to use in-vivo microsystems to make real-time corrections to internal dysfunctions [11].…”

Section: Introductionmentioning

confidence: 99%

“…[7], [15][16][17]. Thus, to secure a necessary and useful power source to the electromechanical device, the generator should be able to produce sufficient power.…”

Section: Introductionmentioning

confidence: 99%

Preliminary study of a pendulum in vivo electromechanical generator for orthopedic implants

Turri¹,

Benbouzid²

2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Abstract-This paper presents the principle and the energy potential of an original electromechanical generator that uses human body natural motions during walking, in order to create an autonomous generator. This in vivo and noninvasive system is intended to be used in intelligent knee prosthesis. As the combined human, mechanical, and electrical phenomena are very significant, a mechanical and an electrical study are then carried to evaluate the recoverable power.

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e-Knee: Evolution of the Electronic Knee Prosthesis

Cited by 66 publications

References 3 publications

Embedded piezoelectrics for sensing and energy harvesting in total knee replacement units

Embedded piezoelectrics for sensing and energy harvesting in total knee replacement units

Ligament balancing in TKA: Evaluation of a force-sensing device and the influence of patellar eversion and ligament release

Preliminary study of a pendulum in vivo electromechanical generator for orthopedic implants

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