[PaulHoule]

It is more likely to happen when they are menstruating so they can get some protection by tracking their periods so that they avoid hard training on dangerous days.

[verteu]

Despite the downvotes, I believe this is true: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC164356/

[PaulHoule]

It's completely true and part of best practices in women's sports.

[bonton89]

Huh, I wonder what the mechanism is there. I wouldn't expect periodic hormonal changes to weaken a ligament.

[dahart]

Correlation/causation. Could be as simple as being more tired than usual. Being tired is more dangerous for lots of sports, and is true for men as well (just not on a predictable schedule).

[PaulHoule]

Why not? There are androgen and estrogen receptors in many tissues throughout the body.