Inspired by the stiffness adjustment principle of the cam and slope-slider mechanisms, a novel reconfigurable variable stiffness joint with linear displacement based on the slope-cam mechanisms is proposed to meet the dynamic trans-interval stiffness adjustment requirement of orthopedic robots during the correction process. Stiffness reconstruction is achieved by adjusting the number of slope-slider mechanisms, spring stiffness, and slope displacement, while the corresponding working principle is illustrated in detail. The joint is designed comprehensively. The active and passive stiffness adjustment mechanism are revealed, and the equivalent stiffness model is formulated. Resorting to numerical analysis software, the mathematical model of stiffness adjustment is established, and the distribution characteristics of equivalent output stiffness and output forces are studied. The virtual prototype model of the joint is established, and the performance simulation analysis is carried out to evaluate the correctness of the theoretical stiffness model. The proposed variable stiffness joint is applied to an orthopedic robot. The equivalent output stiffness of the joint can be adjusted between 34. 08 to 2 762. 64 N·mm -1 , and the corresponding stiffness of the orthopedic robot can be controlled within the range of 689. 94~ 6 250. 41 N·mm -1 , which meets the requirement of deformity correction.