A few random thoughts for you:
1) Tendinitis, when not treated or otherwise dealt with, can become "tendinosis," which is the term physical therapists now use to refer to chronic tendinitis. I have it in my elbow right now. Bummer.
2) Other than ankle sprains and ripped skin (i.e. avulsions or "flappers"), I would say that the most common and prevalent -- and potentially dangerous -- backcountry injury takes place not climbing at all, but rather, COOKING. I know that sounds funny, but burns in the backcountry (either from direct contact with a hot stove or by spilling boiling water) can be very problematic to deal with in terms of pain, infection, and possible loss of mobility -- imagine trying to hike ten miles after pouring a pot of boiling water on your foot!
I work with students in the wilderness and have come to recognize that for this population at least cooking can be the most dangerous part of their day (often because people take such care to be cautious when they perceive danger, like when they're climbing, but let their guard down when cooking).
Hope that's useful info for you.
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