Orthopedics

Download Bone Cements: Up-to-Date Comparison of Physical and Chemical by Klaus-Dieter Kühn PDF

By Klaus-Dieter Kühn

The cemented hip prosthesis is among the so much common operations around the globe within the orthopaedic box. In those operations bone coments are used to mend man made joints filling the loose house among bone and prostheses. As an elastic quarter the cement is ready to buffer the forces affecting the bone. although chemically all cements out there are basing at the similar major substance (methyl methacrylate = MMA) they range of their actual and chemical houses. The emerging variety of bone cements out there makes it tough for the physician to make a suitable selection for sturdy medical long term effects. the current e-book is a whole, certain comparative presentation of all proper actual and chemical houses of the bone cements at the market.

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Additional resources for Bone Cements: Up-to-Date Comparison of Physical and Chemical Properties of Commercial Materials

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On the paper side, there is a label that indicates the composition of both cement components, the expiration date and the batch number. The peel-off pouch may be easily opened. The blister pack contained in it consists of transparent, molded PVC and is sealed with unprinted Tyvek. The powder bottle and the monomer ampoule may be well visualized through the PVC. The blister pack may be easily opened. Both primary packed materials bear a batch number related to the product; this number is not identical to the number on the peel-off pouch on the outer carton.

However, a viscosity that is not too low during the early phase must be guaranteed. If it is not, the applied cement cannot withstand the bleeding pressure in the femur. Blood is included in the cement (Draenert 1988), and these inclusions must be looked upon as distinct weak points with a high fracture risk (Soltesz et al. 1998a, 1998b). This phenomenon is the main problem when using low-viscosity cements (compare Sect. 1), because these are often applied to the body at too early a point due to their short working phase (Draenert et al.

These can also be conducted as tensile, compressive or bending tests. Usually, the fatigue strength is determined in a bending test, because the test device necessary for this test is comparatively simple. Such investigations, which should be made using 10 7 (or, even better, 10 8) alternating loads, take a great deal of time, as the number of load alternations should be between three and five per second (Soltesz et al. 1998a, 1998b). In the literature a multitude of data on the mechanical properties of bone cements can be found.

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