RESUMO
During bone regeneration, the periosteum acts as a carrier for key regenerative cues, delivering osteochondroprogenitor cells and crucial growth factors to the injured bone. We developed a biocompatible, 3D polycaprolactone (PCL) melt electro-written membrane to act as a mimetic periosteum. Poly (ethyl acrylate) coating of the PCL membrane allowed functionalization, mediated by fibronectin and low dose recombinant human BMP-2 (rhBMP-2) (10-25 µg/ml), resulting in efficient, sustained osteoinduction in vitro. In vivo, rhBMP-2 functionalized mimetic periosteum demonstrated regenerative potential in the treatment of rat critical-size femoral defects with highly efficient healing and functional recovery (80%-93%). Mimetic periosteum has also proven to be efficient for cell delivery, as observed through the migration of transplanted periosteum-derived mesenchymal cells to the bone defect and their survival. Ultimately, mimetic periosteum demonstrated its ability to deliver key stem cells and morphogens to an injured site, exposing a therapeutic and translational potential in vivo when combined with unprecedentedly low rhBMP-2 doses.
RESUMO
Buckle or torus fractures in the distal forearm are characterized by a bulging of the cortical bone. They are a frequent reason for consultation in pediatric emergencies. The treatment and follow-up of this type of fractures varies from soft immobilizations to a plaster cast. The purpose of this study is to assess the stability of buckle fractures of the distal radius. We reviewed 106 pediatric patients with buckle fractures and analyzed the radiographs at the time of initial consultation and at the last follow-up. None of these fractures displaced further, regardless of the treatment given. Buckle or torus fractures do not need follow-up radiographs. As they are stable, the simpler immobilization treatment is sufficient.
