A bone fixation device (1) for internal fixation of bone fragments with a longitudinal axis (2) and comprising: A) a first and a second plate (3, 4) each having a lower surface (5), an upper surface (6), two lateral surfaces (22, 23), a front surface (7) axially intermediate between said first and second plate (3, 4), an axially terminal surface (8) and at least one screw hole (17) extending from said upper surface (6) to said lower surface (5) and intended to receive a bone screw B) a first and a second guide rail (13, 14) arranged parallel with respect to said longitudinal axis (2) and uniaxially slideably connecting said first and second plate (3, 4) and C) at least one resilient member (15, 16) arranged between said first and second plate (3, 4) acting as a compression spring.
