The quality and reliability of short videos about rotator cuff tears on Chinese social Media platforms (TikTok and Redbook): A cross-sectional study

Abstract Objective This cross-sectional study evaluated the content, quality, and reliability of short videos about rotator cuff tears on TikTok and Redbook. Background With rotator cuff tears increasing, social media has become a key source of patient information, though content quality varies significantly. Methods On February 1, 2026, we searched for relevant short videos on major Chinese platforms. After collecting metadata, we assessed clinical reliability and educational quality using the Global Quality Score (GQS), modified DISCERN (mDISCERN), and Patient Education Materials Assessment Tool (PEMAT). Spearman's correlation analyzed relationships between video metrics and quality scores. Results Among 181 videos analyzed (94 TikTok, 87 Redbook), overall quality was moderate (median GQS and mDISCERN: 3.0). TikTok videos scored significantly higher on GQS than Redbook, though mDISCERN and PEMAT showed no significant inter-platform differences. Videos from orthopedic and rehabilitation professionals demonstrated significantly higher understandability (PEMAT-U) than those from other medical fields, but actionability (PEMAT-A) did not differ significantly across groups. Quality scores correlated positively with user engagement metrics (likes, collections, shares). Conclusion rotator cuff tears videos on Chinese platforms demonstrate moderate quality. While orthopedic specialists provide highly understandable content, actionability requires improvement. The positive correlation between quality and engagement suggests audiences recognize valuable content. Healthcare professionals should leverage short videos to disseminate quality, actionable guidance, and platforms should optimize algorithms to prioritize professional medical voices.