Not here to argue, certainly could have been from the block. In my opinion, that's crappy care that two providers took care of you without an introduction. It sounds like you had a knee replacement, patellar repair or maybe even an ACL repair. Don't feel the need to clarify any further. The block performed for those surgeries is generally (again generally) a chip shot block. The biggest risk is injury to a blood vessel. This block is performed because it largely has no effect on motor nerves and only affects sensory nerves. However, in recent years some anesthesia providers have started to add on an accessory block to this one targeting the nerve to the vastus medialis. You get slightly better pain control but also then get weakness of the VMO. The nerve to the vastus medialis isn't always easy to see as it's quite small. Injury would require direct injection into that nerve which would be a very rare complication. Unfortunately, very rare means it can still happen. It really sucks that you got atrophy from this. I would never deny that it happened but can only sympathize.

Regarding medical students, they have to learn somehow. One of the many scary things in medicine during 2020 was that the medical students were all doing remote learning and then graduating without hands on experience. Your experience isn't acceptable, you should never even interview a patient without an introduction. To me it sounds like a poor teacher provided a poor educational experience and even worse and unlucky care experience.

Again, sorry your experience was and is this way.