I posted this about returning to work elsewhere, but here it is again...
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3-4 months? Maybe not such a good idea...maybe. After reading "billions and billions" (Carl Sagan) of posts, here are some thoughts...
1. It's all very individual...some people can handle it at 4 months, most have problems.
2. Depends on the job. Desk work, although difficult sitting in one position for hours, is doable but still painful. Nurses running the hallways is near impossible. "I will b on my feet for 7 hrs" puts you in the latter category. Teachers have the same issue. Construction and factory workers...not a chance...maybe...there are individual exceptions.
3. The mandatory requirements for returning to work are: 1. You are off the opioids; 2. You have done the PT to get your 0 / +120 ROM back; 3. You've done a significant amount of exercise to restrengthen your quads, core and glutes to support the new knee; 4. You are mentally strong enough to handle your workload.
4. Those who go back to work too early report a lot of problems with pain and especially swelling. Their work pushes the knee beyond what it can take at that point in their recovery. So they report waking up, going to work, having increasing pain and swelling throughout the day, getting home in a lot of pain, icing and elevating as best they can and then having trouble sleeping because of the pain. THEN, they wake up the next day and have to repeat the cycle all over again. Not a pretty picture.
5. The majority of people report returning to work around six months, some a bit sooner. At that point, pain and swelling don't occur as frequently.
Again...all individual. We have had some people on the Forum who have gone back to work in the 3-4 month range, deal with their issues and get past it...they are not the majority who have tried it at that point in their recovery.
For you, be prepared for the worst and hope for the best. I'd be exercising my butt off right now to be as strong as possible.