Spieth was asked if he sustained the injury during the Wells Fargo Championship or after.
Here's his full explanation:
"No, it was after I got home. I was just playing with my son. I wasn't even holding him or anything. I was just pushing myself off the ground while he was like laughing and going side to side. Something just popped and jammed, and then all of a sudden, I couldn't move it and got on it right away.
"Ended up with an MRI the next morning and went through a few specialists and tried to figure out the right plan for it. I was very shocked I was able to -- I was pretty surprised I was able to play last week. I talked to Cameron [his coach] about it on Sunday before the tournament, and I said, 'Hey, I might be up to 50/50'. He said, 'I'll still call you 25 percent yes, 75 percent no, to be honest, but we'll get there and see'". - Jordan Spieth
Spieth continued:
"So I thought, if I could -- if I get through four rounds and I was not going to make anything worse or jeopardize anything going forward, then I thought it would be worth it and you just never know. Turns out you can't really kind of fake it into a major. You kind of really need to be as prepared as possible.
"But I got better each day, and hand held up, wrist held up really well. At this point, I don't feel like I'm rushing things. I think I'm on par with following the docs I've talked to, and it's kind of a week-to-week thing because it's something that can get worse, and if it does, I need to cut it off immediately."
He said he doesn't have any plans for an immediate break, but will take one before heading to the UK for the co-sanctioned Genesis Scottish Open.