A fixation device comprises a first body having a threaded end, a longitudinal axis, and a bore perpendicular to the longitudinal axis. A second body is received in the bore. The second body has an exterior thread and an interior passage for receiving a pin or wire. The second body has a wire locking device for retaining the pin or wire. An advance nut engages the exterior thread. The advance nut abuts the first body for moving the wire locking device away from the first body when the advance nut is turned, for tensioning the pin or wire.