inpain45,
Welcome to eHealth. I almost missed your message, it was buried in the plethora of postings.
Let me make sure I have things straight.
You sustained a comminuted humerus fracture, which as treated with an ORIF (open reduction and internal fixation) using a plate (and screws). This was around 3 weeks ago.
You also have some injury to your hand or wrist, which is being treated with splinting.
Hope that is correct.
We cannot give you specific medical information, because we do not have access to your x-rays and do not know exactly what injuries you have. So, the best place to get that is from your surgeon. That said...
As to the swelling and edema you have, that is best treated with finger motion and elevation. With the humerus being fixed, you should be able to elevate the hand some. The finger motion and elevation will help to push the swelling back into the body.
The little roller tool you have is to help push the edema back up the arm. You should start distally (away from the body) and push it up the forearm/arm proximally (towards the body). You can also you massage. Massaging and pushing the fluid up the arm, back into the body.
But, actively moving the fingers is probably the best way to remove edema.
Since you have some type of hand or wrist injury, which will slow down some of your rehab. But, you should be moving your fingers as much as possible. You should also be doing elbow motion. Moving the hand up and down. Up to your mouth and down till the elbow is straight. This may take a little while, but work on getting the elbow motion to as "normal" as possible.
As for shoulder motion. Again, since the humerus has been fixed, you should be able to start pendulum (Codman's) exercises. These are basically just getting the upper extremity swinging a little.
You lean over, putting your good hand on something stable. Let you injured arm hang limp at your side, always from the body. Then gently, get it swinging side to side, front and back, making the movements just a little bigger. Then try circles. Loosening up the shoulder motion.
These are usually the first shoulder exercises.
As to other shoulder exercises, that depends upon how well your fracture is healing. You do not want to put too much of a bending moment on the plate, till the fracture starts to show some healing (callus formation).
The plate and screws are just an internal splint. While is can take some stress, repented bending is not in it repertoire.
Thus, exercises which include actively (using your own muscles) moving the arm away from the body will have to be okayed by your surgeon.
Things which provide support for the arm, can probably be done. This includes things like wall walks and pulley exercises.
The wall walks are just standing at a wall, about a foot away, then putting your fingers on the wall, walk the fingers up the wall to head height to start. As you get more motion, you can go higher.
Do the wall walks standing straight in front of the wall, then standing to the side.
As your arm gets stronger, stand a little further away from the wall.
Pulley exercises require the equipment. This is an overhead pulley with a rope, with handles at each end. Grasping the handles in each hand, use the good hand to pull the injured arm up. You should not use any muscles in your injured arm, except to hold on to the pulley. You may have some problems doing this with your injured hand. But, it may actually be some therapy for your injured hand also.
There are some exercises with a cane, using the good hand/arm to move the injured one. But, these are a little more advanced and should be shown to you by a physical or occupational therapist.
So, you really need to find out from your surgeon how much activity you are allowed to perform.
As to the sling, if you are having discomfort in the fracture site when you do not use the sling, you should use the sling.
You may also find that you get really tired when you do not use the sling. So, you might want to try going without the sling for a while, but have it handy for when you get tired.
Again, would on finger motion. Get the edema out of your hand and arm. Work on elbow motion. Try some pendulum exercises, wall walks. Contact your surgeon for advice on how much activity you should be doing with your arm.
Good luck.
Hope your arm heals well.