Definitely not, but based on your symptoms, it sounds as if you may have patellofemoral pain syndrome, the most common source of knee pain in women. Exercises such as running and stair climbing, as well as prolonged sitting in cramped spaces, can irritate the tissue and cartilage around the kneecap. It's possible that your old injury made you more prone to the condition, but it's just as likely the two are unrelated. Nevertheless, make an appointment with your M.D., and be prepared to describe your current workout habits and the accident: Were you in pain or were you able to keep skiing? Did you hear a pop? Did you experience swelling? Were you able to return to regular exercise right away? In the meantime, ice the area for 10 to 20 minutes several times a day and opt for low-impact exercises such as swimming.