An implantable, metallic device in the form of a short, fixed length rod intended to be optionally connected to the upper end of a mechanical rachet-based spinal distraction rod (not included) to increase its length to provide greater load distribution (e.g., when the patient has small pedicles) as part of scoliosis treatment. It is not intended to be implanted without the parent rod. It has a U-shaped end, which may be straight or angled, to allow connection to the parent rod; it is designed to be fixed to the parent rod and vertebrae using bone screws.