Tibia/ˈtɪbiə/ Definition 1 of 3Pro Tip 1/3Body Reference Use 'tibia' to reference specific leg injuries or conditions affecting the shinbone area. The X-ray confirms her tibia is broken. Pro Tip 2/3Medical Term 'Tibia' is technical; use 'shinbone' for more casual discussions about the leg. He has a long scar running down his tibia. Pro Tip 3/3Avoid Confusion Do not confuse 'tibia' with 'fibula', which is the thinner bone beside the tibia. The injury affected both the fibula and the tibia.