When I was Bo's age I pissed all over the floor of the drunk tank in Tofino, slipped in it and sprained my knee. It was swollen double the size and a week later I had it duct taped working 12 hour days 7 days a week, being dropped off by a helicopter in the mountains in the Yukon, in October, for mining/drilling work.
Not saying Bo is soft, but it's been 4 weeks and if its a grade 3, you're going to need surgery anyway and you have 5 months to recover.