Is it possible that i have ganglion after an acciden while my wrist got hurt?

Synovial fluid: Fills ganglion cysts. These cysts are fluid filled sacs and synovial fluid is what lubricates the joint, fluid enters the cyst through a tiny attachment from the joint and makes the cyst large . This is why activity or force seemingly makes the ganglion larger as more pressure in the joint leaks into the cyst. Typically it's a like one way valve into the cyst but they can drain back spontaneously

Yes: Yes, ganglion cysts can have a traumatic cause among other possible etiologies.