Is there a way to treat genu varum without a surgery?

With specific braces: One could try to prevent the g varum from getting worse or slow its progress. This maybe successful for a period of time. If there are no pain, then no further treatments are needed, and just live with it. But generally, these are due to arthritis, which most likely will be painful, requiring treatment. Then pain meds, pt, weight loss if overweight, keeping muscles strong would all help. Good luck.