Tarsal coalition in teens is an abnormal fusion between two or more bones in the foot, usually diagnosed during adolescence as growth plates mature. This fusion limits normal foot movement, causing a rigid flatfoot that cannot absorb impact properly. The stiffness forces the ankle to compensate during walking and sports, which is why rigid flatfoot causes repeated ankle sprains in many teens.
Watching your teen limp off the field for the third time this season is unsettling. You start to wonder if something more is going on beneath the surface. If your teen’s ankle keeps giving out, even during ordinary activities like walking up stairs, a structural issue called tarsal coalition may be the hidden cause.
This condition is more common than most families realize, and it is frequently missed because the symptoms look like ordinary sports injuries. Understanding what tarsal coalition is, and why it leads to a stiff, flat foot prone to sprains, can help you get your teen the right care sooner.
What Is Tarsal Coalition in Teens?
Tarsal coalition happens when two or more of the small bones in the back of the foot, known as the tarsal bones, grow together instead of staying separate. This connection can be made of bone, cartilage, or fibrous tissue. It often forms before birth but does not cause noticeable problems until the bones begin to fully harden during the teenage years.
How Common Is It?
Tarsal coalition affects an estimated 1 to 2 percent of the population, though many cases go undiagnosed because symptoms can be mild or mistaken for growing pains. Teens are often the ones who finally seek help, since this is typically when the condition becomes painful enough to limit activity.
Why Rigid Flatfoot Causes Repeated Ankle Sprains
A healthy foot flexes and adjusts with every step, absorbing shock and adapting to uneven surfaces. Tarsal coalition takes that flexibility away. The fused bones create a rigid flatfoot, meaning the arch cannot move the way it should.
Here is why that stiffness leads to so many sprains:
- Limited shock absorption: A rigid foot cannot flatten and spring back naturally, so extra force travels up into the ankle joint.
- Poor terrain adjustment: Uneven ground, a missed step, or a quick pivot during sports puts added strain directly on the ankle ligaments instead of the foot.
- Muscle fatigue and compensation: Surrounding muscles work overtime to make up for the lack of foot motion, which can lead to weakness and instability over time.
This combination is exactly why rigid flatfoot causes repeated ankle sprains, even in teens who are otherwise active and healthy.
Signs Your Teen Should See a Podiatrist
Pay attention if your teen experiences:
- Frequent ankle sprains, especially from minor missteps
- Foot or ankle pain that worsens with activity and eases with rest
- A visibly flat foot that does not change shape when standing on tiptoes
- Stiffness or muscle spasms in the foot and lower leg
- Difficulty walking on uneven ground
If these symptoms sound familiar, a podiatrist can confirm whether tarsal coalition is the underlying cause through imaging and a physical exam.
How Is Tarsal Coalition Treated?
Treatment depends on the severity of the coalition and how much it is affecting your teen’s daily life.
- Conservative care often comes first, including rest, custom orthotics, physical therapy, and sometimes a short period of immobilization to calm inflammation.
- Surgical treatment may be recommended if symptoms persist despite conservative care. This can involve removing the coalition to restore motion or, in more advanced cases, fusing the joint for stability.
A podiatrist familiar with your teen’s activity level and long-term goals can help determine which path offers the best balance of relief and function.
Getting Your Teen Back on Solid Ground
Repeated ankle sprains are not something your teen should simply push through. If your family has been searching for answers, tarsal coalition may be the missing piece, and the right care can make a real difference in how your teen moves, plays, and feels day to day.
Reach out to our podiatry team today by calling +1-718-367-2555 or visiting us at 1797 Pitkin Avenue, Brooklyn, NY 1121 to schedule an evaluation. Your teen deserves answers and a clear path toward lasting relief.
