I’m only 23 years old and I’ve already had surgery on one of my knees about 7 years ago for meniscus tears. I occasionally still suffer from knee pain, but once the weather gets cold, they start to hurt even worse. Does anyone know what causes this? Also..since I’ve already had surgery and many physical therapy sessions, why do I still have pain? Arthritis runs in my family and I’m scared that if I have knee pain now and I’m only in my 20′s I can only imagine how it will be when I’m older!