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Updated: Jun 19, 2026

A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement

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Published on: May 11, 2020

How to connect a pedicle screw construct to a Ransford Loop: technical note.

Christof Birkenmaier¹, Bernd Wegener, Volkmar Jansson

¹Department of Orthopedic Surgery, Grosshadern Medical Center, Ludwig-Maximilian-University Munich, Marchioninistr 15, 81377 Munich, Germany. doctor-b@web.de

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society

|October 29, 2009

Summary

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Self-Locking Screw

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.

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This technical note details connecting standard pedicle screws to a Ransford Loop rod. It offers a method for spinal surgeons performing add-on spinal stabilization procedures.

Area of Science:

Spinal surgery
Orthopedic technology

Background:

Standard pedicle screw systems are widely used in spinal fusion.
The Ransford Loop is a specialized device for spinal stabilization.

Observation:

A method for connecting a standard pedicle screw system to the 4 mm rod of a Ransford Loop was investigated.

Findings:

The technical note successfully demonstrates a viable connection between the pedicle screw system and the Ransford Loop rod.
This connection allows for add-on stabilization in spinal procedures.

Implications:

This technique may offer surgeons an alternative for complex spinal stabilization cases.
Further research could explore the biomechanical properties and long-term outcomes of this combined construct.

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