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During your child's adolescent growth spurt, his or her bones grow rapidly. If your child is involved in a lot of running and jumping activities during this time, he or she is at risk of developing Osgood-Schlatter disease (tibial tuberosity apophysitis), an overuse syndrome that causes pain, swelling and tenderness just below the kneecap.

Osgood-Schlatter disease occurs more often in athletic kids than in nonathletes, affecting as many as one in five adolescent athletes. The condition develops most often in boys ages 13 to 14 and girls ages 10 to 11. It is slightly more common in boys.

Having Osgood-Schlatter disease can be frustrating, because your child may need to limit his or her running and jumping activity level for a short time. But the condition is temporary — usually lasting six to 24 months — and as your child's bones finish growing, the pain should go away.

Signs and symptoms of Osgood-Schlatter disease include:

• Pain, swelling and tenderness at the bony prominence (tibial tuberosity) on the upper shinbone (tibia), just below the kneecap
• Knee pain that worsens with activity, especially running and jumping, and improves with rest
• Tightness of the surrounding muscles, especially the thigh muscles (quadriceps)

The pain varies from person to person. Some have only mild pain while performing certain activities. For others, the pain is nearly constant and debilitating. Osgood-Schlatter disease usually occurs in just one knee, but sometimes it develops in both knees. The discomfort can last from weeks to months and may recur until your child has stopped growing.

New bone forms from a cartilage growth plate (epiphysis) located at either end of the bone. Cartilage isn't as strong as bone, and stress on the growth plate can cause it to become swollen and painful, especially if your child is very active during his or her growth spurt.

Osgood-Schlatter disease is caused by activities that place repeated stress on the top of the tibia, the big bone in the lower leg, where the tendon of the kneecap inserts. During activities that involve a lot of running, jumping and bending — such as football, soccer, basketball, volleyball, gymnastics and ballet — the pull of the quadriceps can place tension on the band of tissue that connects the knee to the tibia (patellar tendon).

The patellar tendon may begin to pull away from the raised area on the tibia where it attaches (tibial tuberosity), resulting in pain and swelling. In severe cases, the tendon stretches to the point where it actually detaches from the tibia, and it may take a bone fragment with it.

Call your doctor if your child develops symptoms of Osgood-Schlatter disease. Also see your doctor if your child has this condition and the prescribed treatments don't appear to be helping.

Your doctor will conduct a physical examination of your child's knee, looking for tenderness, swelling, pain and redness. He or she will also want to check the range of motion in your child's knee and hip. X-rays may be taken to look at the bones of the knee and leg and to more closely examine the area where the patellar tendon inserts into the tibia.

Complications of Osgood-Schlatter disease aren't common. They may include chronic pain or localized swelling, which often can be helped with icing and anti-inflammatory medications. Even after symptoms have resolved, a "bump" on the tibia in the area of the swelling may remain. This bump may persist to some degree throughout your child's life, but it isn't a cause for concern because it won't interfere with knee function, though the affected knee may look a bit different than your child's other knee.

Osgood-Schlatter disease usually gets better without formal treatment. However, you and your child can take a number of steps to relieve the inflammation and pain. The main form of treatment involves resting the area so that it can heal. This may mean that your child needs to limit the time spent doing activities that aggravate the condition, such as kneeling, jumping and running, or must stop them completely for a period of time.

It may help your child to follow these tips:

• Ice the affected area. This can help with pain and swelling.
• Use pain relievers. Try nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen (Advil, Motrin, others), or take acetaminophen products (Tylenol, others), which might be easier on the stomach. Not all NSAIDs are approved by the Food and Drug Administration for use in children. Talk to your child's doctor or your pharmacist.
• Protect the knee. When participating in sports, wear a pad over the affected knee at the point where the knee may become irritated.
• Relieve stress on the knee. Wear a strap across the patellar tendon during high-impact activities, to help diminish the stress on the area in which the patellar tendon inserts.
• Cross-train. Or, switch to activities that don't involve jumping or running, such as cycling or swimming, until symptoms subside.
• Take care of the area around the knee. Stretch the quadriceps muscles.

In the infrequent cases where pain is severe and other treatments don't help, your doctor may suggest that your child use crutches until the knee heals — usually about six to eight weeks. Very rarely, surgery may be needed if fragmented ends of the bones haven't healed by the time the bones have stopped growing.

Returning to activity
Exactly when your child is able to resume play depends on his or her pain tolerance. Most children can continue playing through a low level of pain without doing any damage. However, if your child plays through severe pain, the condition may worsen and might be more difficult to treat. Severe pain can also inhibit muscle function and make your child more at risk of some other lower extremity injury.

Once the pain has gone away, your child can gradually return to his or her prior activity level. However, your doctor may recommend that your child perform specific strengthening or stretching exercises for the quadriceps muscles to lessen the chances of Osgood-Schlatter disease developing again.

Pain may recur over time, but Osgood-Schlatter disease usually disappears once your child stops growing.

Osgood-Schlatter disease may not be entirely preventable. However, it may help if your child limits his or her activity level if he or she notices the symptoms of Osgood-Schlatter disease. Tight quadriceps muscles cause a "tugging" stress on the patellar tendon where it inserts into the tibial tuberosity, so doing stretching exercises for the quadriceps, hamstrings and calves may help prevent this condition. Being properly warmed up before engaging in athletics and performing cooling down exercises afterward also may help.

Your child may need to temporarily stop or cut back on activities that aggravate this condition until the knee heals. This may distress your child, especially if he or she plays at a competitive level. Make sure your child is aware that as long as the pain isn't too severe, he or she can continue at a reduced level of activity. Your child may be able to perform other activities that don't involve running and jumping, such as cycling and swimming, at a high level. Explain to your child that this is a temporary condition and one that goes away with age.