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1

Influence of the patellar button thickness on the knee flexion after total knee arthroplasty

Rosso I., Surface C., Antonaci P., Surface F. M., Negretto R. J.

Acta of Bioengineering and Biomechanics

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2018

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Vol. 20, no. 4

121-134

EN

One of the main problems of knee replacement is the limit of knee flexion. This study focuses on the knee implant and the patellar component currently in use in total knee arthroplasty, analyzing the influence of patellar thickness on the degree of knee flexion following surgery. Methods: A kinematics study was performed to evaluate whether an optimal patellar thickness can be identified, which enables the maximum flexion angle to be achieved. Using TC images, a healthy model was built. On this basis, a model of a knee joint which had undergone total knee arthroplasty using a Legion PS prosthesis was constructed. Initially, the standard thickness of patellar implant (9 mm) was used to build the model; then several different patellar implant thicknesses (in the range of 5–15 mm) were analyzed. Results: The results show a non-linear trend: a button thickness of less than 9 mm does not change the flexion angle, whereas a button thickness of over 9 mm results in a loss of flexion. The flexion loss is significant in the first two additions of thicknesses but negligible in the last ones. Conclusions: In the case studied, flexion reduction is not linearly proportional to the patellar thickness. The outcome of total knee arthroplasty is considered to be satisfactory with the standard patellar button. The results of this study could be used to compare the kinematics with other total prosthesis and patellar implants, and should enable the optimization of the patellar residue bone thickness to obtain deep flexion.

2

Patellar tracking in the total knee joint replacement model

Jansova M., Kren J., Pokorny J., Koudela K., Koudela Jr. K.

Modelling and Optimization of Physical Systems

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2010

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z. 9

37--40

EN

The study aims to identify the key points that affect the patello-femoral joint stability and stress distribution. The finite element model of the knee joint is used. The femoral component is rotated along the mechanical axis for 5 degrees both medially and laterally. The stress pressure distribution is analyzed within patello-femoral joint during gait cycle.

CS

Tato práce si klade za cíl urćeni klíćových faktorů ovlivňujících stabilitu patelo-femorálního kloubniho spojení a rozloženi napěti v tomto spojení. Je použit konečně-prvkový model kolenního kloubu. Femorální část náhrady je otáčena kołem mechanické osy o 5 stupňů jak mediálně tak laterálně. Nakonec je provedena analýza rozložení napětí na patelo-femorálním kloubu během chůze.

3

Model of the total knee joint replacement

Kren J., Pokorny J, Koudela K.

Modelling and Optimization of Physical Systems

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2009

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z. 8

81--84

EN

The biomechanical investigation of the knee joint is essential in understanding the joint function and interaction of various components in both intact and perturbed condition. The model of the knee joint with total knee replacement is based on the finite element method. The attention of the present study has been focused on the patellofemoral joint and the patella tracking with different Q-angle and condylar twist angle.

CS

Biomechanické studie kolenního kloubu jsou důležité pro porozumnění funkce kloubu a vzájemného působení jednotlivých komponent poškozeného i zdravého kloubu. Kolenní kloub je jeden z nejsložitějších kloubů v lidském těle. Model kolene s totální kolenní náhradou je založen na metodě konečných prvků. Pozornost v této studii je věnována patelo-femorálnímu kloubnímu spojení a pohybu čéšky pro rozdílné Q-úhly a "kondylar twist" úhly. Rozložení tlaku v náhradě kolenního kloubu je prezentováno na konci článku.

4

Movement of the lower leg and patella - dynamic model

Jurkojć J., Tejszerska D.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2002

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z. 19

81-86

EN

The 2D model of human knee is presented in this paper. The anterior and posterior cruciate ligaments, medial and lateral collateral ligaments, patellar ligament and the most important muscles causing movement of lower leg relatively to femur are taken into account. Model enables determination of muscular forces, forces in ligaments, forces between tibia and femur and between patella and femur.

PL

W pracy przedstawiony został dwuwymiarowy model kolana. Uwzględnione zostały więzadła krzyżowe, poboczne, więzadło rzepki i najważniejsze dla ruchu podudzia względem uda mięśnie. Model umożliwia wyznaczenie sił mięśniowych, sił w więzadłach oraz sił reakcji pomiędzy podudziem i udem oraz pomiędzy rzepką i udem.

5

Krioterapia w leczeniu zespołu rzepkowo-udowego

Zimmer K., Skrzek A., Jonak D.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

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1999

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Vol. 5, nr 1-2

11-14

PL

Omówiono możliwości zastosowania krioterapii miejscowej w postępowaniu fizjoterapeutycznym u pacjentów z zaburzeniami stabilizacji rzepki.

EN

Cryotherapy for treatment of chondromalatio patellae The possibility of using the local cryotherapy for patients with chondromalatio patellae is presented.