Overview

Osgood-Schlatter disease is one of the most common causes of knee pain in growing adolescents. It is an irritation of the area just below the kneecap, where the patellar tendon attaches to the shinbone (tibia) at a growth-plate attachment point called the tibial tubercle.

It typically appears during growth spurts, especially in teens who play running and jumping sports, and it is more common in boys — though that gap has narrowed as girls' sport participation has grown. Despite the name "disease," it is a self-limiting overuse-type condition and does not damage the knee long term.

Typical Pattern

Pain, tenderness and sometimes swelling at the bony bump just below the kneecap
Pain that worsens with running, jumping, squatting, kneeling or stairs
Symptoms that come and go during growth spurts
One or both knees can be affected, with one usually worse
The bony prominence may remain after the pain resolves — that is normal and not a sign of ongoing problems
No fever or other systemic symptoms

Why It Develops

During growth, the tibial tubercle is still partly cartilage — a growth plate — and it is the attachment point for the patellar tendon. When the quadriceps muscles pull through that tendon during running and jumping, the repeated traction irritates the growth plate. The combination of a rapid growth spurt and high training load is common, but less active adolescents can develop it too.

How It Is Diagnosed

The diagnosis is made through history and examination: tenderness exactly over the tibial tubercle and pain reproduced by the activities that usually provoke it. X-rays are not needed to make the diagnosis. They are only considered when there are other concerns, such as pain or swelling beyond the tubercle, redness and warmth, or a limp after an injury.

Treatment

The goal is to keep the young person active while making pain manageable:

Activity as tolerated — sports do not need to stop entirely, and continuing activity does not cause long-term damage
Reducing or temporarily avoiding the most painful loads, especially deep knee bending
Ice after activity to settle flare-ups
Stretching the quadriceps and hamstrings, plus general strengthening, as guided by a clinician
Simple pain relief during flare-ups, as recommended by a clinician
A patellar tendon strap can help some people

Symptoms usually settle when growth ends — around age 14 for girls and 16 for boys — though they can linger at some level until then. The bump below the kneecap often stays. Surgery is very rarely needed.

When to Get Assessed

Arrange an assessment if pain stops the young person from participating, keeps returning despite the basics above, or is causing them to consider giving up sport. Seek prompt care if the knee is red, hot and swollen, if there is a limp after a fall or twist, if pain wakes them at night, or if the pain continues after growth has finished.

References

American Academy of Orthopaedic Surgeons. "Osgood-Schlatter Disease (Knee Pain)." OrthoInfo. https://www.orthoinfo.org/diseases--conditions/osgood-schlatter-disease-knee-pain
Merck Manual Professional Edition. "Osgood-Schlatter Disease." https://www.merckmanuals.com/professional/pediatrics/bone-disorders-in-children/osgood-schlatter-disease
van Leeuwen GJ, et al. "Incidence and management of Osgood-Schlatter disease in general practice: retrospective cohort study." British Journal of General Practice. 2022;72(717):e301-e306. https://doi.org/10.3399/BJGP.2021.0386

This information is for education only and is not a medical diagnosis. InjuryAtlas does not replace an assessment by a qualified health professional. If you have severe pain, visible deformity, numbness, loss of function, or symptoms that are getting worse, seek medical care promptly.

Osgood-Schlatter Disease