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Biomet Cement and Cementing Systems


Bone bed preparation

Micro-interlock

Improved cement penetration and increased interface strength are achieved when bone lavage is used.The concept of micro-interlock is well established and appears to be a positive contribution to the quality of fixations. Micro-interlock is the concept of creating a sound cement bone construct.

The interface strength is not only affected by the degree of cement penetration but also by the quality of the cancellous framework. The micro-interlock is the mechanical interlock between bone and cement. It is important to have an optimal micro-interlock in order to achieve a durable interface. Doughy cement applied by hand cannot be induced to penetrate and form interlock in a uniform and predictable fashion.

Doughy cement is easier to use but fails to intrude and interlock with bone. Low viscosity cement has good intrusion characteristics but is difficult to contain in the acetabulum.
There are a number of essential prerequisites for successful micro-interlock.6

To achieve the desired penetration of the bone cement into the cancellous bone three factors are important:

  1. Thoroughly cleaned bone bed, brush and lavage before applying the cement.
  2. Wait and inject the cement until it is of high viscosity- will prevent the blood from penetrating into the cement and thereby weakening it.
  3. Pressurize the cement by using a cement gun and sealing off the bone cavity.