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<p>An interference fit is employed for cementless tibial total knee arthroplasty components to ensure stability post-operatively. Relative motion between implant and underlying bone should be minimised, facilitating osseointegration. Previous experimental limitations have prevented quantification of this motion across the entire bone-implant interface. Furthermore, the intended (nominal) interference fit differs to that actually achieved. This study aimed to 1) experimentally quantify the relative motion across the entire interface of a commercially available cementless tibial component and underlying bone, for cadaveric tibiae through micro-computed tomography (micro-CT) imaging and digital volume correlation (DVC); and 2) assess the relationship between relative motion, actual interference fit, post-impaction strain and bone volume fraction (BV/TV).</p><p>Seven cadaveric tibiae were micro-CT scanned when intact, following resection and, once implanted with a cementless titanium tibial component (Attune, DePuy Synthes), during two time-elapsed mechanical loading sequences that replicated stair descent (SD, 0.0 – 2.5 bodyweight) and deep knee bend (DKB, 0.0-3.5 bodyweight). Actual interference fit was quantified from micro-CT datasets. DVC was employed to extract the post-impaction strain field and, for each load case, the relative motion at the bone-implant interface.</p><p>A sagittal rocking motion of the tray was detected in both SD and DKB, that increased with increased load applied. Tray lift-off was enhanced in the central- and lateral-anterior regions during DKB. Reduced relative motion was significantly related to higher interference in most cases, whilst it was not related to post-impaction strain or BV/TV. This study provides a comprehensive insight into the mechanical environment surrounding a cementless tibial tray in the immediate post-implantation period.</p>

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Relative Motion of Cementless Tibial Trays: Time-Elapsed Micro-CT and DVC Analysis During Stair Descent and Deep-Knee-Bend

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月12日

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  • L. S. Wearne,
  • S. Rapagna,
  • G. Keene,
  • M. Awadalla,
  • M. Taylor,
  • E. Perilli

摘要

An interference fit is employed for cementless tibial total knee arthroplasty components to ensure stability post-operatively. Relative motion between implant and underlying bone should be minimised, facilitating osseointegration. Previous experimental limitations have prevented quantification of this motion across the entire bone-implant interface. Furthermore, the intended (nominal) interference fit differs to that actually achieved. This study aimed to 1) experimentally quantify the relative motion across the entire interface of a commercially available cementless tibial component and underlying bone, for cadaveric tibiae through micro-computed tomography (micro-CT) imaging and digital volume correlation (DVC); and 2) assess the relationship between relative motion, actual interference fit, post-impaction strain and bone volume fraction (BV/TV).

Seven cadaveric tibiae were micro-CT scanned when intact, following resection and, once implanted with a cementless titanium tibial component (Attune, DePuy Synthes), during two time-elapsed mechanical loading sequences that replicated stair descent (SD, 0.0 – 2.5 bodyweight) and deep knee bend (DKB, 0.0-3.5 bodyweight). Actual interference fit was quantified from micro-CT datasets. DVC was employed to extract the post-impaction strain field and, for each load case, the relative motion at the bone-implant interface.

A sagittal rocking motion of the tray was detected in both SD and DKB, that increased with increased load applied. Tray lift-off was enhanced in the central- and lateral-anterior regions during DKB. Reduced relative motion was significantly related to higher interference in most cases, whilst it was not related to post-impaction strain or BV/TV. This study provides a comprehensive insight into the mechanical environment surrounding a cementless tibial tray in the immediate post-implantation period.