What Causes Pain In The Wrist?

Injured left wrist while playing basketball with friends about 6 years ago, fell on it and it looked broken but the x-rays showed no fracture, just tendon/ligament damage. It was put in cast for a few weeks, and no phsyical therapy. I still experience pain in the wrist when lifting weights or turning my hand downwards. Any ideas what could be causing the lingering pain? It does not hurt unless I move it all the way in that downward direction.