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After a TKR, you've gotta do the physical therapy...seriously!!! Your PT will take two measurements in "degrees" or angle: how straight the leg is (a negative number; zero is straight) and how far back it can bend towards your butt (positive number; more that 120 is the goal). When I started, my leg was -14 and + 84. After 9 weeks of PT twice a week plus work at home, I'm -1 and +128...virtually back to normal. If you want full range of motion on your knee again, your goals are 0 and +120 or better. Your therapist should be keeping track of the numbers.
The other goal is to rebuild your quadricep. Leg presses and lifts in the gym...squats at home. Make the quad stronger to take the pressure off the knee. Start slow with light weights and more reps. Build endurance before you build strength. I'm very lucky to have a daughter who is an ACSM and ACE certified personal trainer. She's brutal but effective. Completely rehab'd a total hip replacement in six weeks (5 hours a day, six days a week in a therapy pool and gym). Gotta do the work to get the result you want: A year from surgery, it should feel like the operation never happened.
CAUTION: For the knee, don't push it too hard. Swelling will be the result if you do. Then you have to back off until it returns to normal. Slow and easy for the knee. The hip can be pushed and rehab'd quickly...the knee takes time and patience. Swelling? Back off.
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