Accessible gardening

[Tracydr]

For those of you with handicaps, I'd love to know some of your secrets. A few weeks ago, I suffered a scuba diving injury, decompression illness. This caused me to have osteonecrosis in both knees ( femur, tibia and patella) and maybe my left ankle. I have been dealing with severe pain in my knees and may be looking at surgery. A core decompression, grafts or, most likely bilateral knee replacements, sooner rather than later.
I'm having a hard time getting the tomatoes and other things out that need to be planted right now, not to mention working the soil and weeding.
Just wondering what others do that have mobility issues, since my problem is unlikely to be resolved anytime soon.
I have 1/2 acre, with lots of gardens and it requires quite a bit of upkeep. I can afford somebody to come trim palm trees and weed while I'm working but it looks like I'm going to have to take a leave of absence since I will have to be totally non-weight bearing for awhile to see if the knees can heal from a less agressive treatment and than will have also have lot of PT/rehab to do which would interfere with work.