In fact, I'm still hobbling around, although I've discarded the crutches and hope to be well again soon. (The injury occurred during sparring, which seems to be consistent with many of my previous physical pains. But that, as they say, is another story).
However, a good experience did accompany the injury, which occurred mid-class. After some ice and acupuncture, I returned to the dojo and sat down for the remaining half hour. And I just observed; a fly on the wall.
Although I've done this in other dojos, I've never really done this at my own. I removed myself from the class and my peers, and just soaked in what I observed on the mats. While there is no big epiphany here, I found it insightful, and in many instances picked out a few things I may have missed if I was directly involved. I also had a chance to watch how others learned and how others taught. It had an almost out-of-body feel, as if I was hovering above the room like a strangely dressed ghost in a white gi.
But while the situation was interesting, and i recommend trying it (not for as long, perhaps), after fifteen minutes or so I was eager to jump back in. That, however, will have to wait until next week--with a little luck--when I can walk more than a few steps without grimacing from the pain.