How much pressure does the REX Cement Stop put on the surrounding bone?
Laboratory testing has proven that, because of the built-in safety mechanism, the pressure of the REX Cement Stop on the surrounding bone is limited to a maximum of 25 bar (depending on the amount of expansion of the gelatin). However, the actual pressure that the gelatin has on the femoral bone is lower than 25 bar. The moment the coupling head snaps off, the pressure on the femoral bone can be maximally 25 bar. As soon as this maximum femoral wall pressure has been reached, the head of the REX Cement Stop snaps off. This results in relaxation of the tightened locking mechanism, which results in a wall residual pressure of the femoral bone of 5 to 7 bar. With reference to the critical pressure of 24 bar – the maximum pressure that can be put on the femoral shaft before fractures occur – the REX Cement Stop is completely safe.
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