Clinical Study of Umbilical Cord Blood Mononuclear Cells (UCB-MNCs) in the Treatment of Traumatic Fracture Healing

Inclusion Criteria: * Traumatic long bone fracture. * Noninfectious bone nonunion, delayed bone union. * 3 months after the operation of the fracture, the examination showed no callus growth, no signs of progressive repair at the fracture site, fracture piece space \< 5mm. * No shortening, angulation and displacement. * There was no obvious callus growth 8 months after local bone grafting. Exclusion Criteria: * There are infection foci at and near the fracture end after fracture. * 3 months after the fracture, tests showed partial callus growth. * Combining shortening, angulation and displacement phenomena. * Partial callus grew 8 months after local bone grafting.