Osgood-Schlatter disease

Osgood-Schlatter Disease: Understanding and Treating the Young Athlete's Knee

Seeing your teenager suffer from knee pain and having to limit the sports they love can be worrisome. Osgood-Schlatter disease is common among teenagers who are very active in sports during their growth spurt, more so than among less active teens. If your child is one of them, know that you’re not alone.

Here's the good news: this condition is not serious. In the vast majority of cases, it resolves completely and naturally once growth is complete. Your young athlete is not broken. Their knees are more resilient than you might think.

Physiotherapy is the first-line intervention to manage this pain and allow for a safe return to sport. To understand how this discipline can help, consult our complete guide to physiotherapy and its therapeutic approaches.

What is Osgood-Schlatter disease?

Osgood-Schlatter disease is an irritation of the tibial tuberosity that occurs during rapid bone growth in athletic adolescents. It is not a true disease, but rather a reaction to mechanical overload. It generally improves once growth is complete. However, some young people may continue to experience tenderness or residual pain in the knee for several years after diagnosis.

An important clarification: the term "disease" might sound alarming, but it simply describes temporary discomfort related to skeletal development. The tibial tuberosity is the small bony bump located on the shinbone, just below the knee. During growth, this area remains more fragile and susceptible to repetitive stress.

This condition occurs during puberty, at the time of maximum growth spurt. Young people participating in sports with repetitive jumping have an increased risk. Basketball, volleyball, gymnastics, and soccer are among the activities most often associated with this condition, as they intensely stress the knee extension mechanism.

The frequency of this condition varies depending on gender and physical activity level. Boys are more often affected than girls, mainly because their growth spurt happens later and often coincides with an increase in their sports activities.

What symptoms should you look for in your teenager?

Symptoms include pain localized beneath the kneecap, which is aggravated by sports and jumping. A visible, tender lump appears in this area. The pain often affects only one knee, but the other knee may also be affected. It generally improves with rest.

If you ask your teenager to point to where it hurts, they will likely point directly to the tibial tuberosity. You might feel a small bony bump there, which is often swollen and tender to the touch.

Activities that worsen the condition are predictable: jumping, running (especially accelerating or braking), climbing stairs, and squatting. Kneeling directly on the floor is particularly uncomfortable because the pressure is applied directly to the irritated area.

Swelling varies from one young person to another. It might feel slightly warm to the touch after sports. It should never be red or very hot, as this would suggest an infection.

The daily progression of pain follows a characteristic pattern. In the morning upon waking, your child usually feels no pain. As the day goes on, especially after physical education classes or sports practice, the discomfort gradually increases. This activity-related variation is reassuring, as it confirms the mechanical nature of the condition.

Why does this condition occur during growth?

The condition results from a mismatch between rapid bone growth and muscle-tendon adaptation during puberty. Repetitive pulling of the patellar tendon on the growth plate creates irritation and pain. This is not an injury, but a normal reaction of a growing bone.

During puberty, long bones grow from growth plates located near their ends. These plates are areas of cartilage that gradually turn into solid bone. The growth plate at the tibial tuberosity typically appears around age 11 and fully fuses between ages 14 and 18.

Apophyses are the points where a tendon attaches to a bone that is still growing. During adolescence, bones grow rapidly. These growth spurts make growth plates and apophyses more vulnerable to injury. Osgood-Schlatter disease affects one of these apophyses, located on the front of the tibia, below the kneecap.

The quadriceps muscle (at the front of the thigh) pulls on the patellar tendon when it contracts during physical activity. This tendon attaches to the tibial tuberosity, a fragile growth plate. When a young person engages in a lot of sports involving jumping and sudden changes in speed, this repetitive pulling irritates the growth plate.

The biomechanical process is simple to understand. Every time your child jumps and lands, runs and stops suddenly, or climbs stairs, the quadriceps muscle contracts powerfully. This contraction creates a pulling force on the patellar tendon, which in turn pulls on the tibial tuberosity. In adults, this bone is mature and strong. In growing adolescents, this area remains vulnerable.

Several contributing factors increase the risk:

• Bone growth that is faster than muscle adaptation
• Tightness in the quadriceps or hamstrings
• High training intensity
• Playing multiple sports at the same time
• Sports techniques that heavily engage the extension mechanism

Among young athletes, playing a single sport for more than 8 months a year is associated with an increased risk of overuse injuries. Osgood-Schlatter disease is precisely such an overuse injury of the growing knee.

Muscle stiffness plays a particularly important role. If the thigh muscles (quadriceps and hamstrings) are stiff, they exert increased constant tension on their attachment points. This excessive tension increases mechanical stress on the tibial tuberosity.

Among young athletes, training for more hours per week than their age in years is associated with more injuries of all types. This is a simple guideline for determining the appropriate training load for a growing young athlete.

How is this condition diagnosed?

Diagnosis is based on a clinical examination that includes four key elements: appropriate age (10-15 years), pain localized to the tibial tuberosity, a palpable and tender bump, and worsening symptoms with sports activities. X-rays are rarely necessary, and no blood tests are required.

An experienced physiotherapist or doctor can usually diagnose Osgood-Schlatter disease in a few minutes. The examination begins with simple questions about age, level of sports activity, and the exact location of the pain.

A physical examination quickly confirms the diagnosis. The professional will feel the tibial tuberosity to identify where the pain is most severe. This palpation precisely reproduces the pain experienced. The tenderness is localized to a very specific point, not spread across the entire knee.

The professional may also perform simple functional tests. For example, asking the young person to squat or jump in place. These movements typically reproduce the pain, which strengthens diagnostic certainty.

In some cases where the diagnosis remains uncertain or when symptoms do not exactly match the typical clinical picture, imaging may be requested to rule out other conditions. However, for the vast majority of young people, a clinical examination is sufficient.

How does physiotherapy help your teenager?

Physiotherapy helps through education, managing training loads, quadriceps and hamstring stretches, and progressive strengthening. It allows most young people to continue their sports activities with appropriate modifications during natural healing.

The physiotherapist's role begins with education. Understanding the benign and self-resolving nature of this condition significantly reduces anxiety, both for you and your young athlete. This educational step is often underestimated, but it forms the foundation of successful management.

Load management is the most important intervention. The physical therapist helps identify which activities worsen symptoms. Then, the therapist works with the young athlete, you, and sometimes the coach to temporarily adjust the volume or intensity. Often, temporarily reducing the volume of jumping and running—depending on pain tolerance—allows symptoms to improve while still maintaining the activity.

This load management approach does not necessarily mean stopping sports completely. Instead, it involves intelligently adjusting certain parameters: reducing the number of repetitions of a specific exercise, alternating intensive training days with lighter days, or modifying certain movements to decrease stress on the knee.

Stretching exercises are the second key component. Regular and gentle stretches for the quadriceps and hamstrings help reduce tension on the tibial tuberosity. These stretches should be held for 30 to 60 seconds and repeated daily.

Progressive eccentric strengthening can also be incorporated once acute symptoms have subsided. These exercises strengthen the tendon and improve its ability to tolerate sports loads. They should be introduced gradually and supervised by the physiotherapist.

Applying ice wrapped in a cloth for 15 to 20 minutes after physical activity reduces discomfort and pain. Never apply ice directly to the skin.

Ice and relative rest can relieve pain, but they do not shorten the duration of the condition. Staying comfortable in daily life remains a worthwhile goal.

If your teenager's knee pain affects their participation in sports, our specialized physiotherapists can assess their condition and create a personalized plan. Discover our physiotherapy services for knee pain.

Can your teenager continue playing sports?

Most young people can continue playing sports with appropriate modifications. Temporarily reducing the amount of jumping and running—depending on pain tolerance—often helps control symptoms. Complete cessation is generally not necessary. Continuing to participate helps maintain physical fitness and social connections with the team.

The strategy is not to stop everything, but to adjust intelligently. Your child can generally continue to participate in practices and games by modifying certain aspects. For example, reducing the number of jumps during warm-up or limiting repetitive sprints.

A practical guide for assessing tolerance: pain should not exceed 3 or 4 on a scale of 10 during activity. It should not cumulatively increase from one session to the next. If your child wakes up the next day with more pain than before training, it's a sign that the volume was too high.

Staying active is generally safe. Tolerable pain during exercise doesn't mean your knee is getting damaged. You should adjust your activity based on how comfortable you feel rather than stopping altogether.

Communication with the coach is important. Explain the condition and the recommended modifications. Most coaches understand and can adapt exercises for your child while keeping them integrated into the team.

Some young people benefit from using a bandage or a knee brace with a protective pad during sports. This protection reduces discomfort during direct contact or falls on the knees.

The bump may remain tender for a long time after kneeling or from a direct blow. A protective knee brace can help in contact sports.

How long does this condition last?

How long does this condition last? The duration varies greatly from person to person. In many young people, symptoms subside as they continue to grow. However, knee pain or tenderness may persist long after diagnosis in some young people. Complete resolution usually occurs once the tibia has finished growing. Symptoms vary depending on activity. Once growth is complete, the pain often subsides. However, residual knee pain or tenderness may persist into adulthood, particularly when kneeling or upon direct contact.

The progression of symptoms does not follow a fixed timeline. The pain may be mild and intermittent at first. It may intensify if the activity continues without adjustment. It may then persist, at a tolerable level, for a variable period of time. It usually subsides gradually as growth comes to an end.

The duration varies depending on the stage of skeletal maturation at the time symptoms begin. A young person who develops the condition at age 12 may live with it for 3 to 5 years. Another who develops it later, during adolescence, may experience a different course of the condition, generally lasting until the tibia has finished growing.

The long-term prognosis is excellent. Adults who have had Osgood-Schlatter disease do not show an increased incidence of knee osteoarthritis or significant functional limitations. Many retain a prominent bony bump at the tibial tuberosity; in most cases, it causes little or no pain, but residual tenderness when kneeling or upon direct contact often persists.

This persistent bump is simply the result of additional bone formation that occurred during the growth period. It generally does not cause any significant functional problems and does not limit physical activities in adulthood, although occasional discomfort when kneeling may persist.

The bony bump under the kneecap may remain permanently, even after the pain has gone away. It is a change in the bone's surface, not a sign that the problem persists.

When should you consult a specialist?

When should you see a specialist? See a specialist if the pain persists at rest, does not improve despite proper physical therapy, or if significant swelling develops in the joint. Also see a specialist if your knee locks up or gives way. These rare situations require a thorough evaluation to rule out other conditions.

Most cases can be effectively managed by a physiotherapist without needing a specialized medical consultation. However, pain at rest that does not lessen should be a cause for concern. Typical Osgood-Schlatter disease significantly improves with rest.

If your child complains of pain at night while in bed—even though they aren't moving or putting weight on their knee—this is out of the ordinary. This nighttime pain warrants further evaluation to ensure that no other condition is present.

In rare situations where pain persists after the growth plate has closed, an orthopedic consultation may lead to considering surgery. The procedure usually involves removing a small bone fragment that has not fused correctly. The results are generally excellent, but only a small minority will require this intervention.

Supporting Your Young Athlete

Osgood-Schlatter disease is a temporary condition with an excellent outlook. Your role as a parent is to offer emotional support and patience during this growth phase. Remind your child that they haven't done anything wrong and that their knees will heal naturally.

The psychological aspect should not be overlooked. For a teenager passionate about sports, having to reduce their training can be frustrating. They may fear losing their spot on the team, disappointing teammates or their coach, or seeing their performance decline. Your understanding and support make all the difference.

Help your child maintain a realistic perspective. This reduction in activity is temporary and strategic. It does not mean the end of their sports career, but rather a smart adaptation to protect their long-term health.

With the right modifications and physiotherapy follow-up, the vast majority of teenagers navigate this period while maintaining their sports participation and athletic development. The key lies in patience, communication, and adherence to therapeutic recommendations.

Don't hesitate to ask your physiotherapist questions. Clearly understand the signs that indicate your child can continue and those that suggest slowing down further. The more informed you are, the more effectively you can support your teenager during this growth period.