Pain where the body bends is read as resistance to a change you are being asked to make. Dream books tie it to inflexibility or to bending further than feels right.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.