I’m 8 days post op TNR and having difficulty with leg lifts. My PT said that nature is going to resist when you want to use the recovering leg. Best thing to do is raise your good leg several times first and get your brain to ‘train’ the injured leg into thinking it’s OK to be raised. Painkillers have helped tremendously for the workouts but are lousy when it comes to side effects. It’s a timing thing too. Need to take oxycodone at least an hour before workout. Keep pushing thru the pain, it’s a rough ride but one worth taking!