Adaptive fixation stiffness, while maintaining the stability of fracture repositioning, is the external fixator provides the optimal fixation stiffness in accordance with the original development of bone embryo, making full use of the adaptive control of bone on stress, adjusting bone growth and resorption, promoting the process of fracture healing, and completing the optimal reconstruction of bone function until the bone healing is restored to the most perfect degree, that is, the stiffness of fracture fixation increases with the strength of bone healing In other words, the stiffness of fracture fixation decreases as the strength of bone healing increases, and the mechanical strength of bone increases as the stiffness of fixation decreases. This concludes that strong fixation is implemented early in the fracture, elastic fixation with axial and combined stress stimulation is provided in the middle stage, and balanced fixation is provided in the later stage. This concept is consistent with the biological process of fracture fixation, healing, and reconstruction, and provides theoretical guidance of practical significance for the rational application of external fixation techniques in clinical practice. So far, adaptive stiffness of fracture fixation can only be achieved by means of extraosseous fixation. In other words, the correct application of external bone fixation techniques can accelerate the bone healing process and bring the fracture to a perfect state of functional healing and shaping. The “Harbinphenomenon” in the treatment of bone defects by BoneTransport proposed by Qu Long [13] further elaborates the “concept of natural reconstruction in orthopedics” in detail, including how to use it through a specific method. The details of the “Harbinphenomenon” were further elaborated, including how to achieve tissue regeneration and functional reconstruction through specific time variables, i.e., moving the bone block by 1 mm per day (digital), and rationalizing the changes in tensile and compressive stresses (intelligent). The “Harbin Phenomenon” is the application of bone transfer external fixation device in the treatment of bone defects, 1mm distance per day to gradually move the truncated free active bone block, the bone block in a constant action of a kind of pulling and compressive stress to repair the defect, and finally the bone block and the bone end together to heal. In the process of bone removal, there are soft tissues and even a large amount of infected tissues embedded in the middle of the bone defect, which were not removed before treatment, but these tissues did not affect the healing of the bone in the end, and even part of them became bone tissue, and the “disappearance or transformation of unwanted soft tissues into bone tissue, including the regeneration of other tissues in bone removal treatment defect is called bone removal Harbin phenomenon”, this phenomenon is unbelievable! The textbook teaches how to remove the soft tissue between the bone and the bone and then implant the bone, otherwise the bone will not heal [14], while the process and the result of bone removal are exactly the opposite, this information fully confirms the “natural reconstruction concept of orthopedics” proposed by Qin Sihe, “the body has a great potential for natural repair. This information fully confirms the importance of “the body has a great potential for natural repair, and the doctor’s responsibility is to create the conditions to avoid over-intervention in the body” as proposed by Qin Sihe in the “Natural Reconstruction Concept”. The concept of “natural reconstruction in orthopedics” is in line with the value rationality and decision rationality of the harmonious development of modern medicine. Since human being is a product of “natural selection”, any trauma and disease is part of the life process, and the medical mode of treating disease should follow the natural law of life process. In the context of the mainstream development of orthopedic surgery, Qin Sihe has been the first to practice in the field of “lower limb morphology and functional reconstruction”, which has attracted the recognition and attention of some experts in the orthopedic field [15], such as: (1) severe hip and knee deformities of the lower limbs (2) for degenerative or traumatic arthritis, continuous pulling of the joint with an external fixator can keep the joint moving under a certain joint space, thus repairing the articular cartilage or changing the line of gravity, avoiding or delaying (3) after the gradual completion of bone lengthening with external fixation technique, limited internal fixation technique is added, and the implantation of controlled intramedullary pins can make the results of treatment more reliable; (4) arthroscopic technique (the use of external fixators to distract the joint gap is conducive to the advantages of arthroscopy); (5) correction of hip or femoral deformity, the surgery first uses external fixators to adjust and fix the amputated ends to achieve orthopedic (6) for open or complex fractures of the extremities, simple external fixation techniques should be used to fix the fracture ends and provide favorable conditions for the implementation of internal fixation techniques such as plates. In conclusion, when implementing various internal fixation techniques for fractures and artificial joint replacement, if attention is paid to the implementation of the “orthopedic natural reconstruction concept”, it will increase the advantages of alternative reconstruction and reduce complications. External bone fixation technology involves multidisciplinary knowledge and skills in pathophysiology, biomechanics, biophysics, medical engineering, and basic orthopedic techniques, and is not a simple technology as one might think. The treatment is an intertwined, progressive, and dynamic process of surgery and non-surgery, and the tension-stress law is considered a four-dimensional treatment method with a philosophical concept because of the addition of “time” as an adjustable variable [16], and the doctor should have “space-time The physician should have the philosophical thinking consciousness of “time and space, the situation, and the existence of the absence”, and master the clinical art of doctor-patient interaction and moderate communication, without a scientific and factual attitude, it is difficult to give full play to the advantages of bone external fixation technology. At present, the training mode of orthopedic surgeons in China, the traction direction of medical market, the management system of orthopedics in large hospitals and the mainstream guidance of orthopedic academia are not conducive to the play and promotion of the advantages of bone external fixation technology. Modern orthopaedic external fixation technology will be decomposed orthopaedic specialties tend to unify The form of existence of life is a unified whole, the movement of the human body is a unified action of the whole, overly refined specialties have made the overall development of orthopaedic science a dilemma The World Orthopaedic External Fixation Academic Conference held in Cairo in September 2007, the group reported on 25 topics related to orthopaedics, covering almost all orthopaedic specialties, including spinal orthopaedics These included hand surgery, reconstruction in foot and ankle surgery, and resection of tumor segments and limb reconstruction of certain bone tumors. The basic research basically answers the question of how the mechanical force of external fixation is converted into biological force, and how to stimulate the activation of stem cells, cell division, and tissue generation in the pulling area, so as to repair the limb stump. It illustrates the theoretical, technical and clinical achievements of modern bone external fixation techniques, which almost unify the differentiated orthopedic surgery specialties again. Among them, the combined bone external fixator, with its simple and fast surgical operation process of needle threading and installation of fixation, does not require high, top and sharp equipment, and can be completed by general surgical and anesthesia conditions, which is especially suitable for the rescue and treatment of mass limb trauma caused by sudden events: natural disasters such as earthquakes. Modern bone external fixation technology has been carried out with other disciplines and specialties for multi-level and all-round joint research and mosaic, and the serious complications worried in the past have been reduced to a minimum, achieving some goals of regenerative medicine limb reconstruction and becoming the most effective, cheap, suitable and minimally invasive surgical treatment system for treating difficult orthopedic miscellaneous diseases. At present, the natural reconstruction of the structure and function of the limb (body-plastic engineering) has been achieved to varying degrees in clinical practice. We are developing fields related to human health, microcirculation reconstruction, and cosmetic surgery, such as maxillofacial plastic surgery, dwarfism height enhancement, correction of adult internal and external “eight” gait, various scar contracture foot and ankle deformities [18], ischemic diseases of the extremities [19], stump lengthening and reconstruction after amputation, severe trauma, osteoarthritis distraction and treatment [20], etc. Among them, the invention of combined application of intramedullary nailing technology or intramedullary lengthening device has overcome the shortcomings of external fixators, and there is still much room for innovation and development of bone external fixation technology in the clinical field, especially in the field of “lower limb reconstruction”. In China, there are tens of millions of serious limb trauma, limb deformity, limb mutilation formed after the Wenchuan earthquake, and many difficult orthopedic diseases that are difficult to be treated by traditional orthopedic techniques, which require the concept of natural reconstruction of orthopedics led by modern bone external fixation technology to obtain satisfactory results. We should change our concept and practice, reform the unreasonable management system of the specialty, and create a technical system of “lower limb morphology and function reconstruction” with Chinese characteristics that is widely recognized by the international community.