A dynamic subsidence plate (10) is described having a first plate (12) member and a second plate member (14) in sliding engagement that may infinitely subside between a first and second assembled position. The plate includes a lock assembly (16) associated with the first and second plate members (12,14). The lock assembly includes a ramp portion (18), an interference portion (20), and a bearing member (19) situated between the ramp portion and the interference portion. The lock assembly (16) of the plate (10) is configured to allow movement of the first member (12) with respect to the second member (14) in a first direction in an infinite number of positions between a first assembled position and a second assembled position. Further, the lock assembly (16) alternatively prevents movement of the first member (12) with respect to the second member (14) in an opposite second direction between the first and second assembled positions.
