Experimental pre-clinical assessment of the primary stability of two cementless femoral knee components

Sanaz Berahmani, Maartje Hendriks, David Wolfson, Abraham Wright, Dennis Janssen, Nico Verdonschot

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

To achieve long-lasting fixation of cementless implants, an adequate primary stability is required. We aimed to compare primary stability of a new cementless femoral knee component (Attune®) against a conventional implant (LCS®) under different loading conditions. Six pairs of femora were prepared following the normal surgical procedure. Calibrated CT-scans and 3D-optical scans of the bones were obtained to measure bone mineral density (BMD) and cut accuracy, respectively. Micromotions were measured in nine regions of interest at the bone-implant interface using digital image correlation. The reconstructions were subjected to the implant-specific's peak tibiofemoral load of gait and a deep knee bend loading profiles. Afterwards, the implants were pushed-off at a flexion angle of 150°. Micromotions of Attune were significantly lower than LCS under both loading conditions (P ≤ 0.001). Cut accuracy did not affect micromotions, and BMD was only a significant factor affecting the micromotions under simplified gait loading. No significant difference was found in high-flex push-off force, but Attune required a significantly higher load to generate excessive micromotions during push-off. Parallel anterior and posterior bone cuts in the LCS versus the tapered bone cuts of the Attune may explain the difference between the two designs. Additionally, the rims at the borders of the LCS likely reduced the area of contact with the bone for the LCS, which may have affected the initial fixation.

Original languageEnglish
Pages (from-to)322-329
Number of pages8
JournalJournal of the mechanical behavior of biomedical materials
Volume75
DOIs
Publication statusPublished - 1 Nov 2017

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Bone
Minerals
Computerized tomography

Keywords

  • Digital image correlation
  • Loading condition
  • Micromotion
  • Primary stability
  • Uncemented total knee replacement

Cite this

Berahmani, Sanaz ; Hendriks, Maartje ; Wolfson, David ; Wright, Abraham ; Janssen, Dennis ; Verdonschot, Nico. / Experimental pre-clinical assessment of the primary stability of two cementless femoral knee components. In: Journal of the mechanical behavior of biomedical materials. 2017 ; Vol. 75. pp. 322-329.
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Experimental pre-clinical assessment of the primary stability of two cementless femoral knee components. / Berahmani, Sanaz; Hendriks, Maartje; Wolfson, David; Wright, Abraham; Janssen, Dennis; Verdonschot, Nico.

In: Journal of the mechanical behavior of biomedical materials, Vol. 75, 01.11.2017, p. 322-329.

Research output: Contribution to journalArticleAcademicpeer-review

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