A force adjustable spring distractor device having an elongated, relatively thin guide plate, a force adjusting rod member having first and second oppositely threaded portions, first and second anchor bodies mounted on the guide plate and the threaded portions of the rod, first and second distractor bodies mounted on the guide plate and the rod, and first and second distraction springs connecting the anchor bodies to the distractor bodies, whereby rotation of the force adjusting rod results in separation of the anchor bodies and elongation of the distraction springs, thereby imparting a separation force to the distractor bodies.