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2 2011

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Pomiar wybranych parametrów biomechanicznych w trakcie realizacji

Zaczyk M., Jasińska-Choromańska D

Pomiary Automatyka Kontrola

2011

R. 57, nr 6

575-578

Praca przedstawia jedną z metod badania osadzenia implantu w tkance kostnej. Opisano metodykę badań, dzięki której możliwa jest ocena jakości osadzenia implantu w tkance kostnej. W badaniach eksperymentalnych nowo poznawanych zjawisk kluczowe staje się odpowiednie dobranie aparatury pomiarowej. Poprawny dobór przyrządów pomiarowych pozwala na jednoznaczny opis badanego zjawiska lub obiektu.

The paper presents one of the methods of testing an implant mounting within the osseous tissue. It describes a methodology of the studies, which makes it possible to evaluate quality of the implant mounting within the osseous tissue. In the case of experimental studies of new phenomena being just investigated, it is crucial to appropriately select the measurement equipment. A correct selection of the measuring instruments allows one to unequivocally describe the studied phenomenon or object. A specific character of biomechanical properties of bones makes it impossible to carry out experiments using universal measuring machines, what results in a necessity of building custom test stations as well as special measure-ment systems based on well-developed measurement applications. As far as the described method of testing is concerned, there can be distinguished the following three stages:- the first, including preparations of the objects for the studies,- the second, including carrying out of measurements using the objects that have been prepared beforehand,- the third, including analytical determination of numerical values of the studied parameters. At the first stage, a minimum of the sample should be prepared, using an osseous tissue taken from a closer shaft of a cow thigh bone. After a pretreatment of the bone, a fragment of the tested mandrel should be mounted within it. The test station for experimental studies of the mandrel mounting within the osseous tissue must ensure a possibility of a real-time recording of the related displacements and load forces. The experiment was repeated many times in order to minimize the scatter of the indications. Basing on the obtained results, mutual correlations of particular data were determined, e.g. displacements of the mandrel within the bone in relation to the applied load. The obtained results make it possible to specify what kind of dynamics of the load applying influences the osseous tissue reaction rate.

Ocena dokładności wyników eksperymentalnego badania połączenia implant-kość

Zaczyk M., Jasińska-Choromańska D., Kołodziej D.

Pomiary Automatyka Kontrola

2011

R. 57, nr 6

579-582

Praca zawiera opis metodyki wyznaczenia niepewności dla pomiarów biomechanicznych realizowanych podczas badań eksperymentalnych osadzenia implantu w tkance kostnej. Przedstawiona procedura szacowania niepewności pozwoliła określić, które z etapów procesu pomiarowego eksperymentu miały znaczący wpływ na błędy wyników i z jaką ufnością można podchodzić do wartości liczbowych, opisujących badaną własność biomechaniczną.

The paper presents a methodology of determining uncertainty in biomechanical measurements realized during experimental studies of an implant mounting within an osseous tissue. The presented procedure of evaluating the uncertainty allows one to determine which of the stages of the measurement process of the experiment had a significant influence on the errors of the obtained results, and how much is a confidence level corresponding to the numerical values describing a studied biomechanical property. Values of biomechanical properties are usually obtained in an experimental way. A unification of the analysis of the studies is a decisive factor with respect to the reliability and usability of the results, as well as a possibility of comparing these values for a given property obtained in other experiment. Analysis of the sources of the measurement uncertainties with respect to the realized process of recording the given numeric values of the properties searched for, provided it has been carried out reliably, allows one to create a mathematical equation of the related process. Analysis of evaluating uncertainty related to the presented experiment proved that both the measurement equipment and the methodology of experimental studies were selected correctly, and the most significant influence on the resultant errors had its source in biomechanical properties of the materials used for building the object of experiments. It was impossible to eliminate error sources related to the applied osseous material, since each bone used for building a sample originated from a different specimen, having at the same time its own individual characteristics.