This three-arm randomized controlled trial (RCT) uses Redcap system for 1:1:1 randomization. The AI exercise prescription group receives intervention through the "Yidong Health AI Exercise Prescription System" delivered via WeChat mini-program; the paper exercise prescription group receives traditional paper-based guidance; and the routine care group receives standardized health education and basic exercise instructions. The primary outcome measure is knee flexion range of motion (ROM) at 6 months, with secondary outcomes including HSS score, WOMAC index, TUG test, BBS balance scale, and other functional assessment measures.
