The effect of bone ingrowth depth on the tensile and shear strength of the implant-bone e-beam produced interface

M. Tarala (Corresponding Author), D. Waanders, J.E. Biemond, G. Hannink, D. Janssen, P. Buma, N. Verdonschot

    Research output: Contribution to journalArticleAcademicpeer-review

    12 Citations (Scopus)

    Abstract

    New technologies, such as selective electron beam melting, allow to create complex interface structures to enhance bone ingrowth in cementless implants. The efficacy of such structures can be tested in animal experiments. Although animal studies provide insight into the biological response of new structures, it remains unclear how ingrowth depth is related to interface strength. Theoretically, there could be a threshold of ingrowth, above which the interface strength does not further increase. To test the relationship between depth and strength we performed a finite element study on micro models with simulated uncoated and hydroxyapatite (HA) coated surfaces. We examined whether complete ingrowth is necessary to obtain a maximal interface strength. An increase in bone ingrowth depth did not always enhance the bone–implant interface strength. For the uncoated specimens a plateau was reached at 1,500 μm of ingrowth depth. For the specimens with a simulated HA coating, a bone ingrowth depth of 500 μm already yielded a substantial interface strength, and deeper ingrowth did not enhance the interface strength considerably. These findings may assist in optimizing interface morphology (its depth) and in judging the effect of bone ingrowth depth on interface strength.
    Original languageEnglish
    Pages (from-to)2339-2346
    Number of pages8
    JournalJournal of materials science. Materials in medicine
    Volume22
    Issue number10
    DOIs
    Publication statusPublished - 2011

    Keywords

    • METIS-283028
    • Shear strength
    • Interface strength
    • Bone ingrowth
    • Finite element method model
    • Coated specimen

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