Hip and knee osteoarthritis (OA) are highly prevalent worldwide. The guidelines recommend physical activity and education as the core treatments for osteoarthritis. Digital health has the potential to engage people in physical activity and disease management. Therefore, we conducted a pilot trial to assess the usability and preliminary effectiveness of an app-based physical activity and education program (Join2Move) compared to usual care for people with hip and/or knee OA in Germany. A randomized controlled pilot study was conducted. Individuals with diagnosed or self-reported knee and hip OA were included. Allocation to the intervention or control group was randomized. The intervention group received the Join2Move program. The Join2Move program was previously developed as a website and evaluated in the Netherlands. For the current study, the program was translated and adapted to the German context and adjusted from a website to an app. The control group received usual care. The primary outcomes were usability and preliminary effectiveness (pain and physical functioning). Measurements were taken at baseline and at twelve weeks. The data analysis was performed using SPSS (IBM SPSS Statistics 29.0). Sixty participants, with a mean age of 61.9 (SD ± 7.2) years, were allocated to the intervention (n = 32) or the control group (n = 28) and included in the analysis. The majority of participants had knee OA (68%), and 12% had hip and knee OA. The dropout rate was n = 11 (18%). No adverse events were reported. Usability was rated as acceptable (mean System Usability Scale = 71.3/100) with a wide range (32.5 to 100). Statistically significant between-group differences were found only for pain (mean difference 8.52 (95% CI 1.01 to 16.04), p = 0.027). Join2Move demonstrated acceptable usability. The preliminary results of the pilot trial indicate the potential of a stand-alone app for the treatment of patients with hip or knee OA. However, the acceptable usability of Join2Move limits its recommendation for everyone. There appears to be room for improvement in app usability and in identifying patients for whom the app is suitable and the right time to use a stand-alone app. German Clinical Trials Register DRKS00027164 .

中文翻译：

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针对髋关节或膝关节骨关节炎患者的基于应用程序的身体活动和教育计划的可用性和初步有效性——一项随机对照试验

髋关节和膝关节骨关节炎 (OA) 在全世界范围内非常普遍。该指南建议将体育活动和教育作为骨关节炎的核心治疗方法。数字健康有潜力让人们参与身体活动和疾病管理。因此，我们进行了一项试点试验，以评估基于应用程序的身体活动和教育计划 (Join2Move) 与德国髋部和/或膝部 OA 患者的常规护理相比的可用性和初步有效性。进行了一项随机对照试点研究。诊断或自我报告膝关节和髋关节 OA 的个体也被纳入其中。干预组或对照组的分配是随机的。干预组接受了Join2Move 计划。 Join2Move 计划之前是作为网站开发的，并在荷兰进行了评估。对于当前的研究，该程序已被翻译并适应德国环境，并从网站调整为应用程序。对照组接受常规护理。主要结果是可用性和初步有效性（疼痛和身体功能）。在基线和十二周时进行测量。使用 SPSS (IBM SPSS Statistics 29.0) 进行数据分析。 60 名参与者，平均年龄为 61.9 (SD ± 7.2) 岁，被分配到干预组 (n = 32) 或对照组 (n = 28) 并纳入分析。大多数参与者患有膝关节骨关节炎 (68%)，12% 患有髋关节和膝关节骨关节炎。辍学率为 n = 11 (18%)。没有不良事件的报告。可用性被评为可接受（平均系统可用性量表 = 71.3/100），范围很宽（32.5 至 100）。仅疼痛方面存在统计学显着的组间差异（平均差异 8.52（95% CI 1.01 至 16.04），p = 0.027）。 Join2Move 表现出了可接受的可用性。试点试验的初步结果表明，独立应用程序具有治疗髋部或膝部 OA 患者的潜力。然而，Join2Move 可接受的可用性限制了它对所有人的推荐。在应用程序可用性、确定应用程序适合的患者以及使用独立应用程序的正确时间方面似乎还有改进的空间。德国临床试验注册号 DRKS00027164 。