compression hose/socks are a great idea as is moving more (if able; if he is not able you can do it for him and it will still help). Elevation also helps tremendously.

However... I feel the need to tell you to bring this up with his MD to find out the reason for the edema. It may be due to w/c use increasing or a lack of leg muscle tone. Or, it could be a sign of something else going on (FYI-Amantadine is also known for this)

As for the compression hose here are some tips.
1) Buy off internet or thru your insurance company broker (footsmart dot com is a good place IMO and a lot cheaper) vs. the local med supply store which is limited in selction
2) wash in net bag &always hang dry
3) get taught the proper way to put them on/off
4) wear tehm before daily swelling begins i.e. before you get out of bed in AM
5) every day you are in the hospital you are entitled to a new pair of compression hose if MD orders (keep the old ones and take them home to wash/keep, as Medicare and insurance are paying for them)