Looks like all is going well. It appears as though a small area has healed but not yet fully mineralised. The nuts and bolts can prevent the bone from rebuilding its fullest strength and that is why it is better to remove them eventually. The holes will be filled in by your body (our bodies are amazing things!) and the remodelling process will continue for a long time. Usually you can choose a good time to have the hardware taken out because you need to avoid contact sports and repeated impacts for a little while. I would expect the last bit of flexion and strength to return over the next year without requiring anything specific.
PS the Xray on the right is upsidedown!
Good luck