Most women have no issues with voiding after TVT surgery. However, it's not uncommon for some women to have difficulty voiding in the short term, needing to have a catheter or learn to catheterize themselves for a short time. In general, most women are back to normal voiding patterns within 6 weeks after surgery.
For more information, see:
After a TVT Operation
http://www.healthcentral.com/incontinence/c/52/26260/incontinence-tvt