Duralane Recovery time

Hello All,
I want to know recovery time after getting injected with duralane injection. My mother was given duralane injection 4 days back and she is feeling a lot of pain. She is unable to walk like she used to prior to getting injected with duralane injection. Doctor suggested that it will take around 2 days to recover from the pain. But, she is still feeling a lot of pain when she walks. Can anybody please tell me whether this is a common behaviour after getting injected with duralane. Also, how many days it might take to return to normal level.