Why isn't my doctor finishing this dwarfs treatment?

Solution 1:

The following items may be required to set the bone: traction bench, splints, plaster powder, bucket, cloth, water source. Make sure all of these are available.

If you have all the materials you should need and still nothing is happening, you could also try dismantling his bed, as this can cause the patient to leave the hospital and restart the healing process. Reinjury can also cause a re-diagnosis and treatment.

Solution 2:

When medical treatment fails you have two choices.

• Reinjury, which has a chance of restarting treatment. It also sometimes puts a gravely wounded dwarf out of my his misery.
• Wait, dwarves will (sometimes) heal on their own, though this will be much slower than actual medical treatment, especially for bone problems.