In reply to kwoods: Have you got the same range of movement in your left wrist as your right wrist? If you have less then you may need to work on some stretching exercises for your wrist.
Do you have any swelling in the left wrist? If so, there are things you can do to reduce the swelling.
You say your wrist is very weak, then there are strengthening exercises you can do, using such things as therbands, theraputty and light weights.
I am currently recovering from a broken wrist and I am suffering from lack of motion, swelling and weakness (it is very weak). I am currently seeing a physio and an occupational therapsit.