My daughter was rear ended at a light, waiting to make a left turn several years ago and WHAM! She felt fine for several days then started having problems with her shoulder... They tried to say her shoulder peoblem could have been from a wrist she broke years before and then asked her what action did SHE try to prevent the accident.... BE prepared.. they will ask you probably if your bad knees caused the broken ribs and what action you took to prevent it from happening....