Osgood-Schlatter disease causes pain and swelling just below the knee in children and adolescents who are still growing. It occurs most often in those who are active in sports. Although most cases are mild, some may be severe and interfere with daily activities or sports. Most cases improve with simple measures and resolve by the time the child finishes growing. Early recognition and proper management can help reduce discomfort and the effect on activities.

Osgood-Schlatter disease is a common cause of knee pain and swelling in growing children and adolescents, especially those who play sports. The main symptoms are swelling and tenderness over the tibial tubercle, the bony bump just below the knee. Frequent physical activity, especially jumping or sprinting, often triggers the condition.

Osgood-Schlatter disease affects about 1 in 10 athletic adolescents, with symptoms usually appearing between ages 8 and 15. Both boys and girls can develop the disease, and it may affect one or both knees. The condition typically resolves as the bone finishes growing.

Osgood-Schlatter disease is also known as osteochondrosis, tibial tubercle apophysitis, or traction apophysitis of the tibial tubercle.

Osgood-Schlatter disease develops when the knee is exposed to repeated strain during childhood or adolescence, when growth is rapid. The patellar tendon connects the kneecap to the tibial tubercle. The quadriceps muscle at the front of the thigh helps straighten the knee. During activities such as running, jumping, and climbing, repeated quadriceps contractions increase the pull through the patellar tendon and place added strain on the tibial tubercle.

During growth spurts, bones and soft tissues may develop at different rates. This can make the tibial tubercle more vulnerable to injury. Repeated pulling by the patellar tendon can lead to small tears, inflammation, and sometimes separation of bone where the tendon attaches.

Tightness or poor flexibility in the quadriceps at the front of the thigh or the hamstrings at the back of the thigh may increase strain on the knee. Certain movements, such as quickly changing direction or landing on one leg, may also raise the risk. Other possible factors include very intense training, focusing on a single sport at an early age, and vitamin D deficiency.

In rare cases, Osgood-Schlatter disease can be linked to trauma or other underlying conditions. Most cases result from repeated use and strain during growth spurts.

Risk factors for Osgood-Schlatter disease include age, activity level, and certain physical characteristics. The main risk factors are:

• Rapid growth during puberty, which increases strain on the knee area
• Sports that involve running, especially sprinting, jumping, or quick changes in direction, such as soccer, basketball, volleyball, gymnastics, football, figure skating, and ballet
• Age, with boys typically affected between 12 and 15 and girls between 8 and 12
• High activity levels, especially among adolescents who play multiple sports, train intensely, or focus on one sport at an early age
• Poor flexibility in the quadriceps or hamstrings, which can increase tension on the knee
• Previous injuries or conditions affecting the knee or foot, such as Sever disease, which causes heel pain related to growth
• Physical factors such as a high-riding kneecap, the angle at the top of the shinbone, or foot arch differences
• Vitamin D deficiency, which may weaken bones and the area where the tendon attaches

Osgood-Schlatter disease symptoms tend to start slowly and may become more noticeable over time. Common symptoms include:

• Aching, pain, swelling, or tenderness just below one or both kneecaps, especially over the tibial tubercle
• More discomfort with movement, especially when running, jumping, climbing stairs, kneeling, squatting, or after a direct hit to the knee
• Limping or trouble walking, particularly after sports or intense activity
• Enlargement of the tibial tubercle
• Improvement with rest, sometimes within minutes or hours after activity stops

A doctor should be contacted promptly if knee pain is severe, does not improve with rest and simple measures, or occurs with swelling, redness, warmth, fever, or pain at night.

To diagnose Osgood-Schlatter disease, a doctor reviews the child’s medical history and performs a physical exam. The doctor may also order medical tests.

The doctor will ask about symptoms, activity level, and recent growth spurts. During the exam, the doctor looks for soreness, swelling, and a noticeable bump at the tibial tubercle. The doctor may also check the flexibility of the quadriceps and hamstrings.

In most cases, doctors can diagnose Osgood-Schlatter disease from the medical history, symptoms, and physical exam. For severe, unusual, or ongoing symptoms, a doctor may order tests to confirm the diagnosis or rule out other causes. These tests may include:

• An X-ray to check for bone changes, swelling, or fragmentation at the tibial tubercle and to help rule out fractures or tumors
• An ultrasound to look for tendon injuries, swelling, or bone fragmentation and possibly monitor progress
• Magnetic resonance imaging (MRI) to produce detailed images of cartilage and bone, which may show early changes or complications in complex or unclear cases

The doctor may order additional imaging or lab tests for unusual symptoms, such as pain at night, fever, or signs of infection.

Treatment for Osgood-Schlatter disease focuses on relieving pain and reducing inflammation while allowing the child to remain active. Most cases improve with nonsurgical measures. Immobilization or surgery is rarely necessary to treat this condition.

Main treatments include:

• Resting or adjusting activities until pain improves, including reducing or avoiding activities that worsen symptoms, such as running or jumping
• Applying ice to the painful area several times a day, especially after activity, to reduce swelling and discomfort
• Taking pain relievers or anti-inflammatory medicines, such as acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs), including ibuprofen
• Physical therapy to improve flexibility and reduce tension on the knee, including stretching and strengthening exercises for the quadriceps and hamstrings
• Wearing protective knee pads or braces to protect the tibial tubercle during sports
• Gradually returning to activity, including sports, sometimes with changes to avoid movements that worsen symptoms
• Using a cast or brace, in rare cases, for severe or persistent symptoms
• Having surgery to remove bone fragments if pain continues after growth is complete

Learning about the course of the disease, how long it may last, and how to manage symptoms can help children and parents cope with the condition, reduce pain, and avoid complications. Most children can continue some activity, and completely avoiding sports is not usually necessary.

Osgood-Schlatter disease rarely causes complications, but pain sometimes continues despite treatment or after growth is complete. Possible complications include:

• An enlarged tibial tubercle that remains after pain goes away
• Pain that continues into adulthood in about 10% of cases, especially when kneeling or pressing on the area
• Small pieces of bone that remain in the tendon below the kneecap and cause discomfort after growth is complete
• Reduced flexibility or strength in the knee because of long-term limits on activity
• Excessive backward bending of the knee if the growth plate closes early, in rare cases
• Ongoing knee pain or tendon problems that may require surgery if other treatments do not resolve them

A doctor should be contacted if pain continues after growth is complete, becomes worse, or occurs with new symptoms such as swelling, redness, or difficulty moving the knee.

Osgood-Schlatter disease is linked to normal growth and activity, so it may be difficult to prevent. However, certain strategies may help reduce the risk:

• Regularly stretching the quadriceps and hamstrings before and after exercise to maintain flexibility
• Gradually increasing training intensity and workload over time
• Using proper equipment and techniques during sports to reduce strain on the knees
• Avoiding a focus on one sport at an early age and allowing time for rest and recovery between training sessions
• Getting enough vitamin D, which is important for bone strength and the area where the tendon attaches

Prevention is not always possible, but these measures may lower the chance of developing Osgood-Schlatter disease or reduce the severity of symptoms.

The outlook for Osgood-Schlatter disease is generally excellent. Most cases resolve on their own as the child finishes growing, with symptoms improving over weeks to months. About 80% to 90% of children recover fully within a year, although some may continue to have discomfort or a prominent bump below the knee.

A small number of adolescents may have prolonged pain or reduced athletic performance, especially if they have poor flexibility or do not adjust their activities. Persistent pain after the growth plate closes is uncommon and is usually related to remaining bone fragments, which can be treated if needed.

Long-term effects are rare, and most children return to normal activities without lasting problems. Education and reassurance can help families understand the disease and know what to expect.

This article was medically reviewed in September 2026.