My cracked radius bone still shows ununion picture on x-ray. the cast had removed. why i don't feel such pain like before?

Clinical union: X-rays are often the last thing to show solid healing after a fracture. Clinically patients recover faster than their xrays. X-rays do not show the granulation tissue, cartilage, and other healing tissues that help stabilize your broken bone.

At times the xray: picture lags behind the actual healing process. At other times the fracture may not be fully healed but the fracture may be stable enough to limit pain with motions . this is common for many minimally displaced fractures that may only need 3-4 weeks of casting ( if stable) before range f motion with art time splinting is started. However overdoing it can bring the pain back from irritation

Varies: Sometimes the fracture may be healed, but not show up on X-ray. Sometimes a fracture will get some degree of stability from scar tissue and soft tissue healing that the pain is minimal. Don't hesitate to discuss with your doctor.