They don't seem to have enough muscle on their legs around the knee area or even thigh muscles, I'm not saying they have fat legs or anything but they have no muscle definition at all, I'm also no physiotherapist or sports trainer but I have to think this can't help in protecting the knee.
I also see that Weir has now got an ACL injury, at 28yo that will be tough.
This is kind of interesting as the doctor I heard talking about it on that podcast I posted earlier on the thread, was talking about how The Matildas had recently had an expensive new training facility built but there was a disproportionate amount of focus on cardio training rather than strength building. But she cited how women (especially athletes) are criticised when their bodies are muscular as it's seen as unfeminine. Serena Williams came up against those kind of attitudes relentlessly during her career. These are the societal factors that are suggested as being at play.