OK, after some time off to let my knee completely rest, I decided yesterday to go ahead and give it a good test.
I took my six-inch hurdles, my weighted sled, and my pole vault poles down to the park and had a nice, little hour-long sprint workout. After warming up and stretching for a while, I did five sprints with the sled, six runs through the hurdles, six walking pole drops, six pole carries through the hurdles, then four more hurdle runs.
After that, I did three 10-meter sprints, three 20-meter sprints, and three 30-meter sprints.
On the way home, I stopped and bought a bag of ice for a 20-minute ice bath, just in case, but the knee felt great, and I was really happy about that.
Today, everything was still fine and so I headed to the gym to do some upper body and core stuff. I didn't do anything leg-related, but by the time I made a trip to Walmart and got home about two hours later, my knee was hurting pretty good. I got another bag of ice and soaked in the bathtub for 20 minutes again, but it still hurts a lot more than I'd like.
Kinda sucks ....
I sent a message to the doc who injected me three weeks ago and asked what, if anything, we can do. I remember something about trying a different kind of injection, but I also remember something about 90 days in between injections.
So, we'll see how it goes ...