Walking across a flat surface may feel perfectly normal, yet climbing or descending stairs suddenly causes sharp knee pain. If this sounds familiar, you're not alone. Many people notice their symptoms only when they use stairs because the knee experiences much greater forces during these movements than it does while walking on level ground. Whether you're an active runner, someone who spends long hours on your feet, or simply trying to keep up with daily life, understanding why your knee hurts … [Read more...]