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The tibia and fibula are the two long bones in the lower leg. They are closely linked at the knee and ankle, but they are two separate bones.
• The tibia is the bone that forms the shin and is the larger of the two
• The top of the tibia connects to the knee joint and the bottom of the tibia
connects to the ankle joint.
• Although this bone carries all the body’s weight, it needs
support from the fibula.
• The fibula forms the calf bone. It is the smaller bone of
the two lower-leg bones and runs parallel to the tibia.
• The top end of the fibula is located below the knee joint,
but is not part of the joint itself. The lower end of the
fibula forms the outer part of the ankle joint (it can
usually be seen as the bony lump on the outside of the
• The fibula doesn’t carry much weight, but instead acts as
a stabilizer for the tibia.
Learn more about the different types of fractures in children.
Fractures happen when there’s more force applied to the bone than it can withstand.
• A lower-leg fracture usually happens due to a “high-energy” force from falls, trauma or a direct blow. These are
often caused by motor vehicle crashes or by direct contact or sudden twisting in sports.
• Whenever there is a trauma to the leg, the impact spreads between the tibia and fibula. Because both bones
absorb the blow, the impact usually results in a combined tibia /fibula fracture.
• A stress (hairline) fracture may also occur in the fibula, although it is far less common than stress fractures to the
tibia, which is a weight-bearing bone. Stress fractures in the tibia/fibula are likely to be caused by repetitive motion,
as in running, ballet, baseball and basketball.
Certain risk factors may also increase a child’s chances of getting a broken tibia/fibula.
Generally, a tibia/fibula fracture is associated with:
• Pain or swelling in the lower leg area
• An obvious deformity or uneven leg lengths
• Inability to stand or walk (more likely with tibia; less likely if only the fibula is broken)
• Limited range of motion in the knee or ankle area
• Bruising or discoloration (may indicate damage to blood vessels)
We are grateful to have been ranked #1 on U.S. News & World Report's list of the best children's hospitals in the nation for the third year in a row, an honor we could not have achieved without the patients and families who inspire us to do our very best for them. Thanks to you, Boston Children's is a place where we can write the greatest children's stories ever told.”