Vet Comp Orthop Traumatol 2025; 38(04): A1-A35
DOI: 10.1055/s-0045-1810291
PODIUM ABSTRACTS

Bone Compaction Improves Immediate Mechanical Stability of the Nail-Bone Interface

A. B. Fracka
1   Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
,
M. J. Allen
2   Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom
,
M. Podsiedlik
3   College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, United States
,
L. M. Dejardin
3   College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, United States
› Institutsangaben
› Weitere Informationen
Auch verfügbar aufVetCenter
 
 

    Introduction: Medial patellar luxation and distal femoral varus (DFV) correction with interlocking nails requires bone-implant interface stability during nail insertion. Current cancellous reaming techniques may fail to provide adequate prelocking nail stability within its metaphyseal tunnel. Subsequent intraoperative loss of reduction may result in incomplete varus correction and patellar re-luxation. While cancellous compaction has been shown to improve screw fixation, its benefits in DFV correction are unknown. Therefore, our study evaluated the effect of cancellous compaction on the immediate bone/nail interface stability using a cancellous bone model. We hypothesized that, compared with reaming, cancellous compaction would increase immediate bone/nail interface stability.

    Materials and Methods: Synthetic bone models were fabricated using 12.5 PCF polyurethane foam, n = 5/group. Specimens were prepared using either standard 7 mm reaming or sequential compaction with 4 to 7 mm mandrels. Mechanical testing included mediolateral bending tests on reamed and compacted specimens and impaction stiffness tests for each mandrel size and I-Loc nail in compacted foam samples. MicroCT analysis of three specimens evaluated compaction-induced changes in foam architecture.

    Results: Compaction increased construct stiffness and load at 5 mm displacement in 12.5 PCF foams (p < 0.0001). Impaction test showed increasing stiffness and load at 32 from 4 mm mandrel to 7 mm mandrel and I-Loc nail. Micro-CT scan results demonstrated significant differences between drilled and compacted samples with clearly defined and wider dense rings around the central hole in compacted specimens.

    Discussion/Conclusion: Our study suggests that, compared with conventional reaming, cancellous bone compaction significantly increases immediate, prelocking bone/nail interface stability in a distal femoral osteotomy model.

    Acknowledgment

    L.M.D. is an inventor of an I-Loc Angle Stable Interlocking Nail, US Patent #8,435,238 B2, he receives royalties from Michigan State University and teaching honorarium: BioMedtrix/Movora I-Loc program. This study was funded by the Michigan State University Endowed Research Fund.


     

    Publikationsverlauf

    Artikel online veröffentlicht:
    15. Juli 2025

    © 2025. Thieme. All rights reserved.

    Georg Thieme Verlag KG
    Oswald-Hesse-Straße 50, 70469 Stuttgart, Germany