Swollen Pisiform Bone is a sign of a fracture or dislocate?

It sounds like you've developed bursitis in your wrist(s). We have bursa sacs in our joints that when overused can be irritated and cause significant pain. In the wrist, the bursa sac is located on the top of your wrist over the area of the metacarpals. In bursitis the sac becomes irritated, inflamed and can increase in the amount of fluid. In bursitis of the wrist it hurts to bend the wrist and put any kind of weight on it. You can also develop a lump on the top of the wrist which in your case would seem like your pisiform is swollen, but bones can't swell. My guess would be that when you pushed down you popped that sac that was developing. Usually a doctor will treat it by aspirating some of the fluid off and tell you to use the RICE method. (Rest, Ice, Compression and Elevation)
Hope this helps you out some. I would see your doctor or an orthopedic if you have continuing problems. But for now you should get yourself a wrist brace, use ice to reduce swelling, and rest it as much as you can.

Pisiform Pain

Pisiform Bone

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Cracked a collar bone falling off a swing set as a kid. Broke the same collar bone falling off a swing set as a slightly older kid. Broke my nose (not a bone I know) falling off a stool and slamming my face into a wall as a really young kid. Almost broke a toe the other day dropping a 2000 some page book on it.

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RE:
Swollen Pisiform Bone is a sign of a fracture or dislocate?
About 6 months ago I got into riding mountain bike trials. About 3 months into riding I started to get really bad wirst pains to where I couldn't ride or hold things up, but it would swell. 3 Months later I gave up cause the pain was to much. I don't know if it has anything to do with...

Pain and tenderness on the palmar and ulnar aspects of the wrist in the area of the pisiform bone may be due to tendinitis of the insertion of the flexor carpi ulnaris, bony fractures or osteoarthrosis of pisotriquetral joint. The additional details that you have provided would suggest osteoarthrosis of the pisotriquetral joint. When you keep your wrist in a hooked position, the flexor carpi ulnaris muscle is relaxed, releasing the tension at the tendinous attachment. I suggest you keep your wrists in this position as much as possible as this will help you heal faster. Keep popping on the excess synovial fluid whenver you feel the swelling and pain as this has been helpful for you. If you condition persists, take some wrist x-rays to rule out fracture or dislocation. Taping your wrists tight will allow you to continue your workout at the gym and stay in shape.

In my experience, this is not a fracture or dislocation, but a tendinitis. The Pisiform bone is a sesmoid bone, or a small bone within a tendon that increases the pulley action of the muscle. The patella is the largest example of a sesmoid.

The Ulnar Nerve runs directly under the pisiform, so any swelling to the area causes the nerve to be compressed, and therefore the pain and numbness you have been feeling, and positioning the wrist in the positions you describe would give relief from that pressure. This is known as Ulnar Tunnel Syndrome (next door to the more common Median Nerve compression called Carpal Tunnel Syndrome).

This is a repetitive motion injury, and all the things you mentioned - biking, keyboarding, weightlifting would contribute to the problem, and once a nerve is compressed, the ligament irritated, and swelling is obvious, you will need some help to recover.

Just as in CTS, some treatment may include steroid injection directly to the area, therapeutic ultrasound, electrical stimulation, stretching, ice, splinting, or even surgery. You have to go to a physician first, then try occupational therapy, and as a final resort, the surgery.

You will have to make some lifestyle changes, but you have already stopped doing things you like and that just messes with your quality of life.

Get some help from a good hand therapist, and you will be able to resume the things you enjoy.