2026-04-29T12:23:37Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/180942024-11-28T14:52:02Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16927

00925njm 22002777a 4500 dc Crovace, Alberto Maria author Lacitignola, Luca author Forleo, Donato Monopoli author Staffieri, Francesco author Francioso, Edda author Di Meo, Antonio author Becerra, José author Crovace, Antonio author Santos-Ruiz, Leonor author 2020-08-11 The main goal in the treatment of large bone defects is to guarantee a rapid loading of the affected limb. In this paper, the authors proposed a new reconstructive technique that proved to be suitable to reach this purpose through the use of a custom-made biomimetic porous titanium scaffold. An in vivo study was undertaken where a complete critical defect was experimentally created in the diaphysis of the right tibia of twelve sheep and replaced with a five-centimeter porous scaffold of electron beam melting (EBM)-sintered titanium alloy (EBM group n = 6) or a porous hydroxyapatite scaffold (CONTROL group, n = 6). After surgery, the sheep were allowed to move freely in the barns. The outcome was monitored for up to 12 months by periodical X-ray and clinical examination. All animals in the CONTROL group were euthanized for humane reasons within the first month after surgery due to the onset of plate bending due to mechanical overload. Nine months after surgery, X-ray imaging showed the complete integration of the titanium implant in the tibia diaphysis and remodeling of the periosteal callus, with a well-defined cortical bone. At 12 months, sheep were euthanized, and the tibia were harvested and subjected to histological analysis. This showed bone tissue formations with bone trabeculae bridging titanium trabeculae, evidencing an optimal tissue-metal interaction. Our results show that EBM-sintered titanium devices, if used to repair critical bone defects in a large animal model, can guarantee immediate body weight-bearing, a rapid functional recovery, and a good osseointegration. The porous hydroxyapatite scaffolds proved to be not suitable in this model of large bone defect due to their known poor mechanical properties. 10.3390/ani10081389 2076-2615 Animals http://hdl.handle.net/10668/4539 32796533 http://hdl.handle.net/20.500.12105/18094 Bone Bone fracture Bone repair Metal endo-implant Titanium alloy Additive manufacturing EBM (electron beam melting) Biomechanics Critical-size bone defect Sheep Animal model Osseointegration Huesos Fracturas óseas Titanio Biomecánica Ovinos Modelos animales Oseointegración Prótesis e implantes 3D Biomimetic Porous Titanium (Ti6Al4V ELI) Scaffolds for Large Bone Critical Defect Reconstruction: An Experimental Study in Sheep