Steve.....I merged your latest thread into your original recovery thread. Please do not start new threads when you have a question come up. We need all your recovery information in a single thread so we don't have to go back and try to find out what you've been through and identify advice given in multiple threads. If you find you'd like a different title for the thread, just post what you want and we'll get it changed for you. All questions, concerns and updates on your recovery should be posted here.
You are doing way too much for your poor knee! You are only 5 weeks out. We usually recommend that folks not go back to work until 10-12 weeks. So at 6 weeks, you're really pushing it. Desk jobs are every bit as hard on a new knee as a more active type of work. The sitting can be just as painful as a lot of activity! The more time you can take off, the better you're going to do.
I suggest that you cut way back on your exercise. Now that you are up and around, you really don't need a lot of "therapy." Some gentle bends and stretches twice a day along with your walking about the house and maybe ONE small errand a day can be your therapy. We usually don't recommend that folks go back to using machines until three or four months out....with the exception of a stationary bike for maybe 15 minutes ONCE a day. The rowing machine and elliptical are too hard on your knee....I recommend you stop them completely for now.
A ROM of 115-120 (and even the 105) is quite in the normal range for 5 weeks. The fact that you have swelling indicates you're working your knee too hard. Your ROM is there and your main job should be to reduce swelling and pain. You do that, not by pushing on your knee (or having your wife push), but by resting, icing (constantly), and elevating (toes above the nose). It's even good to ice through the night when you're sleeping. Just be sure to keep a cloth between your skin and the ice source so that you don't damage your skin.
Walking is good for you as well. But I wouldn't worry about trying distances just yet. That can get to the point of pushing your knee too and cause some of the swelling you're experiencing. If you are able to walk at a good strong gait with no limping, I'd say it's fine to walk with no aids. But....if your stride is shorter than normal and/or you have the slightest limp, please go back to a cane or walker until you are strong enough to do those good strides.