Finally, experiments show that the optimized decoupled RP flexure joint can realize an adjustable callus-deformed direction. The unexpected callus rotational deformation is also reduced greatly compared to previously proposed devices. Results of this paper include that of a translation resolution of 15nm and a rotational. Finite element analysis shows that by using the optimized decoupled RP flexure joint, the callus-deformed direction can be adjusted. All of flexural joints are designed to provide the large rotation angle. Then, optimization is performed to obtain large compliance ratios and constant translational stiffness. Second, the AMD-CM's pseudo-rigid-body model is developed, and the constant translational stiffness condition is found. First, eigencompliance analysis of decoupled RP flexure joints is performed and shows that the rotation axis misalignment is eliminated. In this article, we shall examine the anatomy of the knee joint its articulating surfaces, ligaments and neurovascular supply. It is formed by articulations between the patella, femur and tibia. The decoupled property eliminates the rotation axis misalignment and suppresses unexpected callus rotational deformations. The knee joint is a hinge type synovial joint, which mainly allows for flexion and extension (and a small degree of medial and lateral rotation). This decoupled RP flexure joint is designed by serially combining a 3-leaf cross flexure joint and a parallelogram flexure joint according to their eigenstructures. This is realized by designing a decoupled revolute-prismatic(RP) flexure joint and integrating it into an adjustable-motion-direction compliant mechanism (AMD-CM). This study presents a way to adjust the callus-deformed direction by suppressing unexpected callus deformations. Many existing devices can hardly adjust the callus-deformed directions since their unexpected deformations are not constrained properly. Callus deformations, including amplitudes and directions, greatly impact bone healing.
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