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Article History

Received: 9 November 2018

Revised: 6 February 2019

Accepted: 12 February 2019

First Online: 18 March 2019

Compliance with ethical standards

:

: The scientific guarantor of this publication is Gerhard W. Goerres.

: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

: One of the authors—Zbigniew Lewandowski—has significant statistical expertise.

: Written informed consent was obtained from all subjects (patients) in this study.

: Institutional Review Board approval was obtained.

: 523 study subjects who received triamcinolone have been previously reported in a doctoral dissertation by Julia Simone Landau at the University of Zurich (2010)—“Short term treatment success and predictive factors of minimally invasive lumbosacral injection therapy” (The original title in German language –“Kurzfristiger Behandlungserfolg und prädiktive Faktoren der minimal-invasiven lumbosakralen Injektionstherapie”) and in a poster based on this dissertation—“Short term follow-up in 837 patients undergoing lumbar spine infiltrations” presented at Swiss Congress of Radiology 2010, without subsequent publication in a peer-reviewed journal. Gerhard W. Goerres was the scientific guarantor of this thesis. The main difference between our work and the aforementioned dissertation is that we set out to compare pain relief after lumbar ESI using particulate (triamcinolone) and non-particulate (dexamethasone) steroids, and to explore whether their relative effectiveness could differ for specific patient groups, and the thesis by doctor Landau investigated outcomes and predictive factors for the patients treated only with particulate steroids (triamcinolone).

: • retrospective• observational• performed at one institution