I've been on Forteo for 11 months and for the last 5 or 6 I've been feeling pains like the ones you describe. The worst have been in my knees, for which I saw an orthopedist and, at his recommendation, a physical therapist. It's hard to know to what extent the PT has helped. The pain is better in general, but as you say, it can be unpredictable. I'm having a bone density test this week and it will be interesting to see if there's been any improvement since last year.