Mark (not his real name) is a 48-year-old warehouse supervisor who spends most of his day on his feet. One morning, he woke up with discomfort on the inside of his knee. He tried to ignore it, assuming he had twisted it slightly while working the day before. However, by the end of the week,
Angela (not her real name) is a 55-year-old teacher who spends much of her day standing, walking between classrooms, and kneeling to help students. Over time, she began feeling a dull ache at the front of her knee. She assumed it was normal fatigue from long workdays. But after a week, she noticed a soft
