Knee pain when bending: general information Knee pain when bending is a common problem, with more than 25% of adults suffering from regular knee pain1. You might have noticed that your knee hurts when you bend it, when you walk down stairs or when you squat. The knee is a complex unit of moving parts, including the thigh bone (femur), the shin bone (tibia), the knee cap (patella), and a number of ligaments, tendons, and cartilage and fluid-filled sacs (bursae), which reduce friction and allow for smooth motion. When one or more of these components become damaged through acute injury … Continue reading Knee Pain When Bending