When one is told to 'turn the hip', doesn't this really just mean to pivot? Think about turning the hip while keeping the pivot foot facing the guy and still landing with your shin. You would end up torquing a knee unless you had some abnormal ROM with your internal hip rotation. Think about pivoting the foot (so toes point to side) without turning the hip and still landing with your shin. Again, you would end up torquing the knee. Edit: I am talking about a Muay Thai Angle Kick.