A METHOD BASED ON VIBRATION ANALYSIS TO ASSESS THE STABILITY OF PARTIALLY CEMENTED HIP STEMS - A CLINICAL STUDY

Leonard PASTRAV

cezar.pastrav@mech.kuleuven.be

Siegfried JAECQUES

siegfried.jaecques@mech.kuleuven.be

Michiel MULIER

michiel.mulier@uz.kuleuven.be

Georges VAN DER PERRE

georges.vanderperre@mech.kuleuven.be

Catholic University of Leuven, BELGIUM

Abstract. A change of the boundary conditions of an implant can be indicated by an alteration of the vibrational behaviour of the implant-bone structure. In the case of partially cemented hip stems the contact conditions vary between different situations: uncemented stem and cemented stem with the cement in different polymerisation stages. A pilot study was set up to study the feasibility of monitoring the curing of poly-methyl methacrylate (PMMA) bone cement in situ by vibration analysis during a total hip replacement (THR) procedure. The frequency response function (FRF) evolution reflected the changes at the bone-implant interface due to the presence of the cement.
 

Keywords: cemented hip implant, boundary conditions, cement curing, vibration analysis, frequency response function

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