Femur
From Gomerpedia
A femur is the long bone of the thigh and the longest bone in the body, which articulates at the hip and knee. When a baton is unavailable, a femur is a good substitute during track meets.
Review
Dr. Brock Hammersley (Orthopedic Surgery): My favorite bone in the human body. I prefer the left to the right femur, but that's just me.