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. 2011 Aug;35(8):1165-9.
doi: 10.1007/s00264-010-1137-y. Epub 2010 Oct 16.

Pulsed lavage improves fixation strength of cemented tibial components

Ulf J Schlegel  1 , Jan Siewe, Karl S Delank, Peer Eysel, Klaus Püschel, Michael M Morlock, Anne Gebert de Uhlenbrock
Affiliations

Pulsed lavage improves fixation strength of cemented tibial components

Ulf J Schlegel et al. Int Orthop. 2011 Aug.

Abstract

Pulsatile lavage is purported to improve radiographic survival in cemented total knee arthroplasty (TKA). Similarly, a potential improvement of fixation strength of the tibial tray has been assumed based on the increased cement penetration. In this study, the influence of pulsed lavage on fixation strength of the tibial component and bone cement penetration was evaluated in six pairs of cadaveric specimens. Following surgical preparation, the tibial surface was irrigated using pulsatile lavage on one side of a pair, while on the other side syringe lavage was applied. All tibial components were implanted using the same cementing technique. Cement penetration and bone mineral density was assessed based on computed tomography data. Fixation strength of the tibial trays was determined by a pull-out test with a material testing machine. Median pull-out forces and cement penetration were significantly (p = 0.031) improved in the pulsed lavage group as compared to the syringe lavage group. Enhanced fixation strength is suggested as being a key to improved survival of the implant. Consequently, pulsatile lavage should be considered as a mandatory preparation step when cementing tibial components in TKA.

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Figures

Fig. 1
Fig. 1
Set-up for mechanical testing (adapter detached from material testing machine)
Fig. 2
Fig. 2
Cement penetration depths (left) and pull-out forces (right) for the six tibial pairs
Fig. 3
Fig. 3
Characteristic failure pattern for one specimen pair: syringe lavage (left), pulsed lavage (right)
Fig. 4
Fig. 4
Left: 3D reconstruction of bone and cement mantle. Right: Anterior-posterior projection of the cement penetration depth (mm)
See this image and copyright information in PMC

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