Fracture healing is a repair process of a mechanical discontinuity loss of force transmission, and pathological mobility of bone. Through a sequence of changes of tissue development and geometry, the original structural integrity is restored. The recovery of rigidity and strength is related to tissue differentiation. In unified theory of nonoperative and operative stabilized fractures, the mechanics of primary bone healing involves a complex interplay of physical and biological factors. The different patterns of bone repair respond to physical influences including strain tolerance.