Final answer:
The fracture healing process at the described stage, where new calcium deposits are present but the fracture line is still visible, is in the callus formation phase which is the second stage of bone healing.
Step-by-step explanation:
When an X-ray reveals new calcium deposits at the fracture site with the fracture line still evident, the healing process is in the stage known as callus formation. This is the second step in bone healing, often referred to as the 'soft callus' or 'fibrocartilaginous callus' stage. In this phase, the internal callus forms as a fibrocartilaginous matrix between the two ends of the fractured bone, as part of the body's natural repair process.
The healing stages a fracture undergoes include: (a) the formation of a fracture hematoma, (b) the formation of internal and external calli, (c) the replacement of cartilage by trabecular (spongy) bone, and finally, (d) the bone remodeling phase, where the bone adapts to stress and may become thicker and stronger. Given that the fracture line is still present but new bone growth is observed, the bone is not yet in the remodeling stage, which is the final stage where the fracture line typically disappears.