网红动作"闪身步"在全网爆火，引发大量模仿，但随之而来的伤害也日益显现。扬州大学附属医院等多地医院陆续接诊多名因跟风练"闪身步"导致膝盖受伤的年轻患者，诊断结果包括十字韧带拉伤甚至撕裂1。
"闪身步"源自安徽花鼓灯舞蹈，是专业舞者的基本功1。然而普通人在模仿时容易产生膝盖超角度旋转，导致膝关节的前交叉十字韧带发生非接触撕裂1。十字韧带在膝关节中的作用如同"安全带"，其质地虽然坚韧，但基本无法自愈1。此外，膝关节的承重负担与体重密切相关，体重每增加10斤，膝关节承重负担就会额外增加30斤1。
为了保护膝关节，专家建议在日常生活中控制体重、饮食均衡以补充钙和维生素D、注意保暖、避免久站久蹲，并进行弹力带抗阻训练1。
A viral dance move known as the "flash step" has sparked widespread imitation across social media, but hospitals in multiple Chinese cities have begun treating young patients suffering knee injuries from attempting the trendy maneuver.1 Yangzhou University Affiliated Hospital reported that orthopedic departments across the country have admitted numerous cases of anterior cruciate ligament (ACL) strains and even complete tears among people who mimicked the movement.1
The "flash step" originates from Anhui folk flower-drum dance and represents basic technique for professional dancers; however, when ordinary people attempt to replicate it, they often experience excessive rotational stress on the knee joint, leading to non-contact ACL tears.1 The ACL functions as the knee's "safety belt," and while its tissue is remarkably resilient, it possesses virtually no capacity for self-repair once damaged.1 Medical experts note that every ten-pound increase in body weight places an additional thirty-pound load on the knee joint.1
To protect knee health in daily life, healthcare providers recommend maintaining a healthy weight, consuming a balanced diet rich in calcium and vitamin D, keeping knees warm, avoiding prolonged standing or squatting, and performing resistance band training exercises.1
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