I'm not a Doc. I'm not saying anything...And I've no idea what your situation is.
But there is some interesting data supporting the recommendation.
Good luck
let me tell you.. back in the 1970'a.....we had a doc in Rome/Murphy Memorial that would have all of his back patients immediately get into a "90/90" position....laying flat in bed with several pillows under the knees and stay that way for a couple of days....