Faculty Profile

Biomechanics of Artificial Joint

The biomechanical environment after artificial joint replacement is an important standard to guide the design of the prosthesis, surgical installation, and revision of the prosthesis. Finite element analysis combined with musculoskeletal multi-body dynamics simulation is an effective method for biomechanical research. By establishing a multi-body dynamic model of bone and muscle including bones, muscles, ligaments and cartilage tissues, the biomechanical environment after the replacement of the main joints of the human body is studied, and the motion mode of the prosthesis and the precise boundary conditions for finite element research are obtained. Using the above analysis methods, the team has achieved excellent results in the research of hip and knee joint replacement and revision, temporomandibular joint and cervical joint replacement, and porous material properties.

Biotribology of Artificial Joint

For a long time, wear has been the bottleneck of the service performance and life of artificial joint prostheses. Aseptic loosening caused by wear debris is an important reason for the failure of artificial joints. In addition, the design trend of artificial joints has evolved from anatomical shapes to musculoskeletal mechanical functions. However, the requirements for joint kinematics and wear are contradictory. The collaborative optimization of musculoskeletal mechanical functions and tribological performance is still a world problem. The team used the above-mentioned bone-muscular multi-body dynamics analysis method, combined with tribological optimization design, focused on the key mechanism and core mechanism of the evolution of the artificial joint's in-vivo service behavior, and explored the regulation mechanism of the near-natural motion function and the life of the prosthesis.

The control mechanism of fixation interface loading and regeneration    

The instability of the biological fixation interface is also an important factor that affects the life of the artificial joint and the patient's postoperative satisfaction. A large number of scientific research and clinical practice results have shown that the elastic modulus of metal materials is much higher than that of human bone tissue, resulting in serious mechanical mismatch and stress shielding, resulting in loosening of the metal prosthesis and bone tissue, making it difficult to meet the expected implantation effect. Stress shielding has become a key issue plaguing the development of orthopedic implants. Porous metal material is an effective method to solve this problem. The team intends to study the coupling effect of prosthetic material mechanics and biological tissue mechanics in the in vivo service environment, reveal the mapping relationship between the performance/repair function of the multi-level porous metal, and study the mechanics of the fixed interface in the body mechanics environment The control principle of the bearing and tissue regeneration function finally realizes the optimized design of the fixed surface bearing and regeneration.

Optimized design of personalized artificial joints

In recent years, researchers have found that the failure of the sliding surface and the fixed surface of the artificial joint is not an isolated event. Poor design of the sliding surface will affect the contact mechanics of the fixed surface and cause the fixed surface to loosen. In addition, the stability of the fixed surface will also affect the running effect of the sliding surface. Therefore, after artificial joint replacement, as long as one of the sliding surface and the fixed surface has a design and use defect, it is easy to cause the failure process to accelerate under the long-term mutual influence, and eventually cause the replacement to fail. It can be seen that independent sliding surface or fixed surface design improvement can no longer meet the current requirements, and the design trend of artificial joints should develop from the stage of independently solving the sliding surface wear problem and the fixed surface stability problem to the research of the sliding surface and the fixed surface coupling design. New stage.