Portland Thorns defender Kat Williamson will be out approximately six weeks, according to the Portland Tribune's Caitlin Murray:
Re: #NWSL injury report - Thorns' Kat Williamson had surgery on her medial meniscus in her knee this week. Will miss up to 6 weeks. #BAONPDX
Williamson tweeted Saturday that the surgery was successful:
Sending my love&support to the east coast this weekend!Surgery was a success &I'm on the road to recovery-thank you all for the well wishes!
— Kat Williamson (@KatWilliamson7) May 1, 2016
Williamson was injured during the first half of last Saturday's 1-1 draw against FC Kansas City.