I'm 23 years and i have knock knees can the brace help to correct it without surgery?

Complicated decision: That's really tough. Most kids outgrow it. You've reached adulthood, so joint modeling is complete. Most orthopedic surgeons will tell you they'd rather try conservative (ie nonsurgical) options first, like night braces, because surgery is a big decision. That said, the procedure is minimally invasive, typically very successful & may decrease your risk for early-onset arthritis. Talk to your doc.