Lothur fixed the problem of all the bones and muscles in the legs and in one of the arms of that old man, always using his visual ability to understand what his patient needed.
The ability of his Skull Soul Bone was extremely useful in medicine. It was as if he instantly had every possible check-up that could be done on a body.
He could see the internal organs, the skeleton, and the blood circulating in the bloodstream and use his cultivator senses to measure heart rate, temperature, etc.
By combining his visual ability with the cultivator's senses, Lothur could, in real-time, determine the situation of that body.
And with that, he could combine that patient's unique information with his knowledge to use the best possible approach.
Ordinary doctors did not have such advantages, so most had to rely on their probing, which was not as 'sharp' on weaker and less experienced youngsters.