Bone healing is a complicated biological mechanism that is affected by many hormonal, nutritional, and hemal factors. The term Biomechanical theory of bone healing is a concept that is created by us and is used for the first time to identify and study the influence of mechanical rules on the bone tissue so we can study and imitate its mechanical response depending on the rules of balance and movement. We ensure that bone healing is just adaptation to auto bone forming mechanism in the surrounding mechanical site. The term is more comprehensive and accurate than the bio-compression term which was used before; and all of those are confirming the criteria to evaluate the efficacy of fixators used in orthopedic surgery.