Torture is not the way to help your body heal from this surgery. What painful PT does is maintain, and increase, inflammation and swelling, which will limit ROM and prevent it from improving. Take a step back from this effort and let your body heal.The PT has massaged (torture). I have used a rolling pin on all aspects of the thigh with some good effect.
Stiffness/Tightness is a normal occurrence after this kind of major surgery. Your surgeon did major carpentry work and disturbed every millimeter of soft tissue in this area. You aren't tight because your muscle is underused and needs to be stretched and rehabbed. You're tight because your tissue has been disturbed and is healing...and full healing takes a full year or more.
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. He wasn't a fan of the "more is better" approach. He had been replacing and revising knees/hips for 25+ years, and warned me it's so easy to overdo things and set yourself back. Again, everyone is different, but he was fed up with PTs and "the masses" telling TKR patients that more is better.