Few problems : Sharp pain radiating along the back of the thigh may be caused by a "pinched nerve" involving the sciatic nerve or lumbosacral nerve roots. This may be directly related to your back problem. Swelling & not having difficulty putting weight on your leg may be related to the same or a different condition. See a doctor asap to sort these out so you may get the proper treatment.
Answered 12/12/2013
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