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. 2022 Aug 13;23:647. doi: 10.1186/s13063-022-06610-4

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — SPIRIT diagram for trial stages of enrolment, intervention, and assessment. ^#Telephone-based 2 months + 2 weeks after surgery; ^##two telephone-assisted counselling 3 weeks±1 respectively 4 weeks±1 after the initial face-to-face counselling; ^§questionnaire. Abbreviation: PA: physical activity; PASE: the Physical Activity Scale for the Elderly; the 6MW: 6-min walk test; the 30sCS: 30-s chair stand test; TSC: timed stair climbing; HOOS: the Hip disability and Osteoarthritis Outcome Score; QOL: Quality Of Life; OEE-2: the Outcome Expectancy for Exercise scale-2