Legs completely spent!

Hi guys, relatively new to mountain biking but having a lot of fun so far.
I had knee surgery two years ago and was on crutches for quite a while - enough that my leg muscles withered away.
Now I find that after a decent climb my legs have literally nothing left to give - if I tried to jump on the spot my legs would give way on landing... It seems to take a long time for my legs to recover enough for me to attempt anything like a technical descent on the bike. And even then, after the first climb my legs never feel like they have enough strength in them for the rest of the day's riding...
Any advice please?
I had knee surgery two years ago and was on crutches for quite a while - enough that my leg muscles withered away.
Now I find that after a decent climb my legs have literally nothing left to give - if I tried to jump on the spot my legs would give way on landing... It seems to take a long time for my legs to recover enough for me to attempt anything like a technical descent on the bike. And even then, after the first climb my legs never feel like they have enough strength in them for the rest of the day's riding...
Any advice please?
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What he said.
I had an op last year that kept me off the bike for nearly 4 months and had to build it back up slowly, took about the same time to get full fitness back. If I pushed too hard too soon, I'd get cramps or the legs would just 'give up'.
Try little and often if you can and build up the duration & intensity as/when you feel able to.
Also you need to drink and not big gulps, little and often, dehydration will sap your energy fast.
Dirt Jumper Dmr Sidekick2