Fractured Knee 3-4 Months ago still hurts.

Patient: About 3-4 months ago I slipped and fractured my knee, I walked on it for about 10 days before getting an x-ray and finding out it was fractured due to having it checked by first aid people and being told it was just swollen/bruised bone.even now after 3-4 months my knee still hurts if I run for too long or if I apply weight to it e.g. kneeling on the ground.Why does it still hurt?

Symptoms: knee pain