Interesting to note that Jones stated there was a surgery for his injury, but for him the surgery (and I quote) "wasn't an option" because he didn't want to lose his season.
I think it's probably an injury that takes time to heal, and Jones hasn't given it enough time to fully heal. Every time it gets good enough that he can play with minimal discomfort, he lands awkwardly on the knee, reaggrevating the injury to some degree.
Probably stating the obvious up there.
I wonder if the coaches should spend more time with Jones practicing how to fall / go down, so he can better protect the knee when being tackled.
The NFL: Where Greg Jennings Happens.