Med Biol Eng Comput - Wear analysis of chamfered elongated acetabular cup liners.

Tópicos

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Resumo

This study investigated the wear phenomena of chamfered acetabular cup liners. The liners have three parameters at the lengthened rim: the length of the elongation, the depth of the cup and the chamfer angle. Using published wear volume equations for cylindrically elongated liners, this study analysed the volume of the chamfer to obtain the exact theoretical wear volume of the chamfered liner. The criteria described in our previous paper were used to verify the accuracy of the proposed methodology. The results showed that a shallow cup depth (<2?mm) and a chamfer angle of about 30? could significantly reduce the wear volume arising from the elongation. When the chamfer angle was increased further, this effect became progressively less significant. The results suggest that a chamfer angle up to about 30? is appropriate, but the angle should not be larger than required to obtain the minimum femoral range of motion (ROM). The results of this study can also be integrated with the analysis of the kinetics and kinematics of liners. A compromise design incorporating a lower wear volume, sufficient ROM and a lower contact stress should be possible.

Resumo Limpo

studi investig wear phenomena chamfer acetabular cup liner liner three paramet lengthen rim length elong depth cup chamfer angl use publish wear volum equat cylindr elong liner studi analys volum chamfer obtain exact theoret wear volum chamfer liner criteria describ previous paper use verifi accuraci propos methodolog result show shallow cup depth mm chamfer angl signific reduc wear volum aris elong chamfer angl increas effect becam progress less signific result suggest chamfer angl appropri angl larger requir obtain minimum femor rang motion rom result studi can also integr analysi kinet kinemat liner compromis design incorpor lower wear volum suffici rom lower contact stress possibl

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