A fixation system (100, 110) includes an elongate plate (140) and an extension plate (150). The elongate plate includes an inner wall (142) and has a longitudinal axis. The extension plate has first and second attachment portions (152, 154) offset from one another. An engagement portion (157) extends outwardly from the first attachment portion. The engagement portion is couplable to the inner wall of the elongate plate. The second attachment portion defines an aperture for receiving a fastener. The second attachment portion is revolvable about the longitudinal axis of the inner wall when the engagement portion is coupled to and movable about the inner wall. A fastener (130, 135) is received into the first attachment portion to attach the extension plate to the elongate plate. Another fastener (120) is received into the second attachment portion.
