Is it normal for a 13 year old to have bumps under his knee cap?

Possible Causes of Bumps Under the Knee Cap in a 13-Year-Old

If your child is experiencing bumps under their knee cap, it's essential to consult a medical professional for an accurate diagnosis. Here are a few possible causes of bumps under the knee cap in a 13-year-old:

1. Osgood-Schlatter Disease: This is a common condition in adolescents, especially those involved in sports that involve running and jumping. It occurs when the tendon that connects the kneecap to the shinbone becomes irritated and inflamed. Symptoms include pain and tenderness below the kneecap, swelling, and a noticeable bump.

2. Sinding-Larsen-Johansson Syndrome: Similar to Osgood-Schlatter Disease, this condition affects the growth plate at the top of the shinbone, just below the kneecap. It's more common in young athletes and can cause pain, tenderness, and swelling around the kneecap.

3. Bursitis: Bursae are small sacs filled with fluid that help reduce friction between tendons and bones. When these bursae become inflamed or irritated, they can cause swelling and tenderness. Prepatellar bursitis, located in front of the kneecap, can cause a bump or swelling under the kneecap.

4. Baker's Cyst: A Baker's cyst is a fluid-filled sac that develops behind the knee. It can be caused by an underlying condition, such as an injury, arthritis, or other knee problems. When a Baker's cyst becomes large, it can push forward and cause a bulge or lump behind or below the kneecap.

5. Fat Pad Impingement: The fat pad beneath the kneecap can become pinched or compressed during certain activities, such as kneeling or prolonged squatting. This can result in pain and swelling under the kneecap, along with a palpable lump.

It's important to remember that this list is not exhaustive, and other medical conditions or injuries could cause bumps under the knee cap. If your child is experiencing symptoms, it's essential to seek medical attention for an accurate diagnosis and appropriate treatment.