Use the drop-down menus to put the steps required for bone repair in order from first to last. The broken bone begins to take the shape it had prior to the fracture. A mass of tissue containing cells that produce collagen fibers forms. These collagen fibers extend across the broken bone and attach the pieces back together. A hematoma forms at the fractured area. Osteoblasts and osteoclasts arrive at the fracture and begin to produce bone tissue there.