I ahd had previous surgery ans the therapists there knew of this "tough minded" girl, who used to wok with them,was part-time with other hospital..did housecalls. out of pocket. I trusted the PT's completely. Over this year and a half, while ai waited for someone to step up and do both of mine...sh came to the house, scooped out my neesa, made suggestions...than gve me written and oral instructions with actuasl practice with her...several times..The I was on my own. Fidles around with them for about 4 months..cause they hurt...then gor over that and got to doing all exercises twice a day, with a 2lb ankle weight. Couldn't bike, but could in water..so swam laps and laps for upper workout and breathing...I took a vicodin before the exercises and has ice pack onknee during the leg raises..got me through,,,and I did gain noticible strength, enough so, that walking actually became easier for be as muscles do and will pick up the pressure we plce on our knees. Now, all the musxles know what to do...just a litle sorer to do them...but the programing stays with you. Internet has lots, I just wanted a personal touch..she taught me a lot of the muscle interaction...etc