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Volume 10 Supplement 1

IRSSD 2014 Meeting Abstracts

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Does implant material make a difference to the outcome of scoliosis surgery? Randomized controlled trial by cobalt-chrome rods and titanium rods


The object of this study was to introduce the randomized controlled trial by cobalt-chrome rods and titanium rods in scoliosis surgery.

Material and methods

Though cobalt-chrome and titanium-composite are two major metals used as a rod of spinal instrumentation, there is a paucity of superiority of one material over the other, especially with a high-level evidence.


Four authors of academic hospitals designed and are now performing on this trial supported by Stryker Japan after permission of Institutional Review Board of each hospital.

Candidates are female patients with an age between 10 to 19 with adolescent idiopathic scoliosis which are planned to have surgical treatment by segmental pedicle screw system. Curve profile should be Lenke type 1 to 3, over 45 degrees of the main curve by the Cobb method. We get written informed consent from patients and parents. Exclusion criteria are patients who cannot understand Japanese, patients who have had previous spinal surgery, patients who are pregnant, patient who have allergy to nickel, chrome, or titanium, etc.

Randomization to cobalt-chrome rod or titanium rod is performed with a web-based register adjusted by age, the Cobb angle of the main curve in standing, that in active bending, and the Risser grade. We set a total of 80 cases after power calculation by past reports.

Placement of pedicle screws and techniques of correction maneuver are to be reported. Radiographic parameters by X-ray, CT scan, and MRI at preoperative time, post operative time, and one-year after surgery are to be analyzed. Questionnaires of patient-reported outcome by SRS-22, SF-12, and SJ-27 (AIS-specifc outcome made by Japanese Scoliosis Society) are asked to fill at preoperative time, six-month after surgery, and one-year after surgery.


We designed a practical randomized controlled trial of scoliosis surgery by two different-material rods. The study is now on going.

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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

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Takeshita, K., Tanaka, M., Takahashi, J. et al. Does implant material make a difference to the outcome of scoliosis surgery? Randomized controlled trial by cobalt-chrome rods and titanium rods. Scoliosis 10 (Suppl 1), P30 (2015).

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