An initial scan indicated an operation would be required but the injury has now stabilized and the 84-times capped stalwart hopes to be available for selection against Ireland on 1 August.
"The instability was not as bad as the scan first suggested," said Evans. "They were pleased with how stable my leg was, so I have to have a couple of weeks in a brace to encourage it to reattach itself. I can walk and run on it, I have just got to rest it otherwise it won't improve.
"I haven't had an injury since I broke my leg in 2006, so I have been very lucky with all the sports that I do. Hopefully it will heal quickly. I can still do the bike and gym so I can keep my fitness up, which is great because I'm fitter than I have ever been before."
With Wales's World Cup bid kicking off against Australia on August 20 at Surrey Sports Park, Evans admitted the squad are eagerly awaiting their chance to go head to head with the best teams in the world.
"It's really exciting and everyone in the Welsh squad is now starting to talk about our first game with Australia. It is getting closer and closer and the mood in the camp is really good considering how we went in the Six Nations, getting the wooden spoon and losing to Italy," she said.
"A lot of the players who missed the Six Nations through injury are fit and back and there is really good competition for places in the squad."