It's more difficult if it's certifed and in fairness, you can't ask people to wrap themselves in cotton wool outside of work. I played hurling and rugby and got a few knocks in my time but none of them were serious enough to warrant time off.
You could refer them to your company doctor (if you have one) or occ health specialist for a 2nd opinion/helping your employee as part of your responsibilities.
Can't see what good it would do. Occ Health will tell me they have a broken ankle (I knew that) and they will fit for work once the bones have healed (I knew that too).
Skiing holidays don't sem as popular these days so it's not an issue anymore.