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Article History

Received: 30 May 2023

Accepted: 30 November 2023

First Online: 20 January 2024

Declarations

:

: This study was carried out in accordance with the declaration of Helsinki and ethical approval has been obtained from the Ethics Committee of the University of Tuebingen (Vote number 421/2015BO1). The trial was pre-registered in the German Clinical Trial Register DRKS00009251 on 10 September 2015. All participants gave written informed consent to participate in the present study by returning the consent form and the study questionnaires.

: Not applicable.

: The non-profit health insurance company AOK Baden-Wuerttemberg (AOK-BW) was involved in the trial set-up, data acquisition, conduction of the intervention and data analysis. GM is an employee of the AOK-BW. IK got royalties for the exercise book that every patient of the intervention group received. The Department of Sports Medicine of the University Hospital Tuebingen got financial reimbursement of the fee for the 2-days group education program that was offered to all exercise instructors of the hip and knee training programs in advance to the study. IR, PM and MG have no financial or other interests related to the manuscript submitted to BMC Public Health that might constitute a potential conflict of interest.