Tibial Tubercle Fracture

Description

This is a break of the tibial tubercle — the bump at the top of the shin where the kneecap tendon attaches. It typically happens in older adolescent athletes during a forceful jump or landing.

How it happens (the mechanism)

The extensor mechanism — the thigh muscle, kneecap, and tendon that straighten the knee — anchors to the tibial tubercle. During an explosive jump or landing, that powerful pull yanks the tubercle off, just as the growth area there is maturing. Restoring the anchor is what lets the knee straighten with full power again.

Symptoms

Sudden pain, swelling, and tenderness at the bump below the kneecap, with difficulty straightening the knee or bearing weight.

Doctor examination and imaging

The doctor checks the ability to straighten the knee and the front of the shin; X-rays show the fracture and how far it has shifted.

Treatment

A non-displaced fracture may be treated in a cast with the knee straight. A displaced fracture is usually fixed with screws so the kneecap tendon can work again. Right after the injury, the front of the shin is watched for swelling and pressure, then the knee is rehabilitated gradually.

Recovery and long-term outlook

These heal well, and because they tend to occur near the end of growth, growth-plate concerns are usually minimal. Full knee straightening and a staged return to sport are the goals.

When to call the doctor

Call right away or seek emergency care if pain becomes severe or out of proportion — especially pain when the toes are gently moved or stretched — or the toes become numb, pale, blue, or cold, or the cast feels dangerously tight. These can signal dangerous pressure building within the leg (compartment syndrome). Also call for fever, worsening swelling, or drainage.

Learn more

OrthoInfo (AAOS) — Growth Plate Fractures: orthoinfo.aaos.org

This information is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. For specific concerns about your child, consult a board-certified, fellowship-trained pediatric orthopaedic surgeon.