Do no harm: Who should bear the costs of retired NFL players’ medical bills?

Multiple knee replacements...I would need more information as too why he had "multiple".

Improper knee replacement? Improper fitting? I can produce a list of medical questions.

Also been asked, although in a rhetorical aspect...what about electricians getting zapped and losing a finger or limb?

What about professional skiers that break legs?

Boxers, and the overwhelming evidence that getting smashed in the face is bad?

Where do we draw the line?

Too many variables not enough information to weigh in on either side. /sarcasm to an extent.