Hi,
In your example 'I broke my leg while skiing. After that/Afterwards, I never skied again', can I also use 'subsequently' Yes.
or 'then' instead here? Yes, but it doesn't sound very idiomatic.
'I listened to the radio. After that/afterwards, I watched TV.' (no consequence)
'Subsequently' doesn't fit here, right? Not very well, no.
Clive