Your foot is planted. Your body keeps moving. That’s the entire recipe. A pedestrian steps into a pothole and turns to check traffic. A nurse pivots on a freshly mopped floor. A delivery worker comes down a ladder, loses a rung, and lands twisting. A weekend soccer player cuts left while his cleat stays right. In that half-second, three separate structures inside the knee can tear at once — and patients almost always report the same two details afterward: they heard a “pop,”