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Initial stability of circumferential meshes with impacted bone allografts for massive femoral defects

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Abstract

When the proximal femur is absent due to a failed femoral stem in total hip arthroplasty, impacted bone grafts contained within circumferential meshes could be an alternative reconstructive method. The purpose of this study was to analyse the initial resistance to axial and rotational forces in a fresh frozen bovine model with complete loss of the proximal femur reconstructed with a circumferential metal mesh, impacted bone allografts and a long cemented stem. Four bovine femurs with a complete proximal bone defect were reconstructed with a circumferential mesh, impacted bone grafts and a cemented stem. The results were compared with four intact femurs using the same implant. Under axial load, subsidence was observed at an average of 617 kg in the experimental group, and a cortical fracture occured at 1335 kg in the control group. Under rotational load, experimental femurs failed at an average of 79 kg and the control femurs fractured at 260 kg. This model provided 50% of the resistance to axial load and 30% of the resistance to rotational load compared to an intact femur, which is enough to resist physiological load. This stability encourages the use of circumferential meshes, impacted bone allografts and cemented stems in revision hip surgery with massive bone loss.

Résumé

Dans l’arthroplastie totale de hanche les pertes de substances fémorales secondaires à un descellement de la pièce fémorale peuvent être traitées par des greffes impactées. Il s’agit d’une méthode de reconstruction alternative et satisfaisante. Le propos de cette étude est d’analyser la résistance axiale et en rotation d’allogreffes fraîches impactées d’origine bovine et servant de lit à une pièce fémorale longue. 4 fémurs bovins ont été reconstruits de la sorte, les résultats ont été comparés à 4 fémurs intacts avec le même implant en charge axiale, la migration de la prothèse est observée avec une charge de 617 kg dans le groupe des fémurs greffés et une fracture corticale est survenue à 1335 kg dans le groupe contrôle. En rotation, la pièce fémorale présente une mobilité en moyenne à 79 kg alors que dans le groupe contrôle ceci ne survient qu’à 260 kg. Ce modèle présente donc une résistance de 50% en charge axiale et de 30% en rotation, si on le compare à un modèle fémoral sur fémur intact. Cette stabilité nous encourage à utiliser une telle technique d’allogreffes impactées avec une pièce fémorale cimentée dans les révisions de prothèses totales de hanches avec pertes osseuses massives.

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Acknowledgement

The authors acknowledge the Materials Testing Laboratory, National Technological University, Buenos Aires, Argentina and Johnson & Johnson-De Puy, Argentina for technical support.

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Correspondence to Agustín José Guala.

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Guala, A.J., Buttaro, M. & Piccaluga, F. Initial stability of circumferential meshes with impacted bone allografts for massive femoral defects. International Orthopaedics (SICO 32, 605–609 (2008). https://doi.org/10.1007/s00264-007-0362-5

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  • DOI: https://doi.org/10.1007/s00264-007-0362-5

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