It's far too early in your recovery to start any strength training. We recommend waiting until at least 3 months after a knee replacement for that.I finished my first leg of PT. I’m at 0-125. I go back to OS on Monday. PT wants me to come back for “strength” training. I still can’t walk up or down stairs, my quads are weak and PT thinks they can help with this. On Thursday PT had me try a leg press, ride the bike, try and climb steps, used a box to do “heal touches” (like stepping down with my left leg while pulling myself back up with my rtkr leg. It was extremely hard to do. Like I had to use my arms because my leg is so weak.
Let your knee heal first, before you start stressing it with strength training.
I suggest you tell your PT you are going to take a break from PT and will come back later - if at all!
You see, it's perfectly normal to still feel your leg lacks strength. It's been through major, traumatic surgery. It's wounded, needing gentle treatment, not lazy, needing hard exercises. As it heals, it will regain much of its strength with just the normal activities of daily use.
It usually takes a while before you can manage stairs - sometimes as long as 4 months. Your PT is expecting too much, too soon, from your knee. He should never have had you using a leg press or doing those toe touches. Leg presses are notorious for twisting your knee if you don't get things 100% right and that is dangerous for your knee. It's best not to use them during recovery.
Remember that it's your knee and you are the only one who has the right to say what will happen to it. You are in charge of your own recovery. The only person you have to please is yourself and your knee. In fact, your knee is the boss. It knows what it's doing and it's recovering on its own schedule, not anyone else's.
Right now, it's sore because it's telling you it didn't like those strength exercises. Listen to your knee. Don't do anything that hurts it.
You can say NO to PT at any time.
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New Zealand



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