The femur, also known as the thigh bone, is the longest and strongest bone in the human body. It connects the hip joint to the knee joint, allowing for movement and support during activities like walking, running, and jumping. The femur plays a crucial role in bearing weight and maintaining balance. In addition to its structural importance, the femur is involved in the formation of the hip joint and the knee joint. These joints enable a wide range of motion, making the femur essential for everyday activities. Injuries to the femur can significantly impact mobility and overall quality of life.