Medically reviewed by Paul G. Kiritsis, MD | Reviewed July 2026
Parents in my Midlothian office often assume knee pain in a young athlete is just growing pains, and sometimes it is. But when a preteen or teenage athlete has knee pain that won’t go away with rest, I always check for osteochondritis dissecans in young athletes, a condition where a piece of bone just under the joint surface loses its blood supply. Catching this early is a big factor in whether a young athlete’s knee heals on its own or eventually needs surgery.
Key Takeaways
- Osteochondritis dissecans (OCD) happens when an area of bone just under the knee’s cartilage loses blood flow and can eventually detach, and it shows up most commonly in young athletes between ages nine and sixteen.
- The juvenile form, JOCD, heals in roughly half of cases when it’s caught while the growth plates are still open, unlike OCD diagnosed in adults, which probably won’t fully heal on its own.
- Ignoring persistent knee pain in a young athlete can let a healable lesion progress into adult OCD, so early evaluation matters more than pushing through it.
What’s Actually Happening Inside the Knee
OCD develops at the rounded end of the thighbone, called the femoral condyle, most often on the inside portion that bears the most weight. The cartilage in that spot depends on the bone underneath it for blood supply, and when that blood flow is disrupted, the bone begins to die. Over time, the affected area can separate from the surrounding healthy bone, sometimes breaking off completely and floating loose inside the joint.
Because the lesion sits in a weight-bearing part of the knee, it rarely gets a real chance to rest and heal on its own during everyday walking and standing.
Why Young Athletes Are Prone to It
Most of my JOCD patients have been in competitive, single-sport training since elementary school, whether that’s gymnastics, soccer, or baseball. Repeated stress on a still-growing bone appears to be the main driver, though some kids develop it without any clear overuse pattern at all, and occasionally another muscle or bone imbalance is adding extra stress I need to track down.
Because their growth plates haven’t closed, their bodies have a real shot at healing the lesion if it’s treated early, which is the biggest reason JOCD and adult OCD get managed so differently.
How JOCD Differs from Adult OCD
The juvenile and adult forms cause the same kind of damage, but they behave differently enough that I treat them as separate conditions. In a child who’s still growing, the lesion has a genuine chance to heal on its own. In an adult, the growth plates have closed, and that healing potential mostly disappears. Adult OCD can show up at any age from early adulthood on, though most of the patients I see with it are under 50, and many of those cases likely started as an unnoticed or undertreated JOCD years earlier. That’s really the heart of why I push for early evaluation in young athletes: catching it now gives a much better shot at avoiding the adult version altogether.
What I See in My Patients
The young athletes I see with JOCD almost never come in after one bad fall. They come in after weeks or months of vague, aching knee pain that gets worse with sports and better with rest, which is exactly the pattern that gets mistaken for growing pains.
Parents are often surprised when an X-ray shows a defined lesion, because their child never described a specific injury. Having worked as a team physician at every level of competitive sport, I’ve learned to take a young athlete’s vague, nagging knee pain just as seriously as an acute injury, because it’s often the quieter problem that gets ignored the longest.
Symptoms to Watch For
The pain usually starts mild and gradually worsens with activity. As it progresses, the knee may swell, catch, or even lock if a fragment has started to loosen. In more advanced cases, the affected bone can collapse slightly, and a fragment may break off entirely and float around inside the joint as what’s called a loose body, catching or locking the knee when it gets in the way. A young athlete who limits weight on one leg after practice, or complains that the knee “gets stuck,” deserves an evaluation rather than a wait-and-see approach.
How I Diagnose It
Diagnosis starts with a conversation, not a scan. I ask about the pain’s history, whether there was ever a specific injury, and what makes it better or worse, then I examine the knee by feeling it and moving it through a full range of motion.
Most OCD lesions show up clearly on a standard X-ray. When the picture isn’t clear enough, or I need to know exactly how stable the fragment is, I’ll order an MRI, which shows the soft tissue and bone detail an X-ray can’t capture. That distinction matters, because a stable lesion and a loose fragment can call for different treatment plans.
My Approach to Treatment
When I catch JOCD early, with growth plates still open and the fragment still attached, I start with activity modification rather than surgery. That means rest from the sport, sometimes for several months, not just skipping practice on sore days.
Nonsurgical treatment for JOCD can take ten to eighteen months, and during the early phase I typically ask patients to avoid anything that causes pain, sometimes with crutches or a brace for a stretch of that time.
As symptoms ease, a physical therapist will begin exercises that build strength and motion without loading the joint, usually for several weeks, along with pool-based exercise and shock-absorbing shoe inserts when they help. I’ve seen this approach heal roughly half of JOCD cases, which is exactly why I push back when a family wants to return a young athlete to competition before the bone has had a real chance to heal. I also recheck the knee periodically during that stretch, sometimes with repeat imaging, because a lesion that isn’t improving needs a different plan before more time is lost.
When Surgery Becomes the Better Option
When a fragment has become loose or fully detached, or when nonsurgical treatment hasn’t worked, surgery to fix or remove the fragment becomes the better option. Whenever the fragment sits in a weight-bearing spot and the bone quality allows it, I prefer to reattach it with tiny pins or screws rather than remove it, since a repaired fragment generally gives better long-term knee function than an empty defect.
For lesions that can’t be salvaged, options range from an allograft, where donor bone and cartilage fill the defect, to an osteochondral autograft, where I transplant a small plug of the patient’s own healthy bone and cartilage from elsewhere in the same knee. I’ve had excellent results with the autograft approach in particular, and I’ve seen plenty of athletes return to their pre-injury level of play after it.
Long-Term Outlook
When JOCD heals, whether on its own or after treatment, the knee generally holds up well over time and doesn’t seem to carry an elevated arthritis risk. Adult OCD tells a different story. Because the joint surface damage doesn’t fully repair itself once growth plates close, it can contribute to earlier degenerative changes and osteoarthritis down the road, even after successful surgery. That gap in outlook between the two forms is exactly why timing matters so much, and it’s the main reason I’d rather see a young athlete in my office too early than too late.
Summary
If your young athlete has knee pain that keeps coming back after practice, don’t wait for it to turn into a locked or swollen knee before getting it checked. Schedule an evaluation so we can get imaging early, while there’s still the best chance for the bone to heal on its own.
Frequently Asked Questions
What age does osteochondritis dissecans usually affect?
JOCD, the juvenile form, most often shows up between ages nine and sixteen, while adult OCD is typically diagnosed in people under fifty who likely had an undiagnosed case as a child.
Can osteochondritis dissecans heal without surgery?
JOCD heals in roughly half of cases when it’s caught while growth plates are still open, though it can take up to a year and a half of activity modification. Adult OCD rarely heals on its own, which is why surgery is usually the more effective option once someone is fully grown.
What sports carry the highest risk for JOCD?
Sports involving repetitive impact and single-sport specialization at a young age, like gymnastics, soccer, and baseball, seem to carry higher risk, though some kids develop it without any clear cause.
How do you diagnose osteochondritis dissecans?
An X-ray usually shows the lesion, and I’ll order an MRI when I need a clearer look at whether the fragment is still attached or already loose.
What happens if a fragment breaks off completely?
Once a fragment fully detaches, it can float around the joint as a loose body and cause catching or locking. At that point, nonsurgical treatment generally isn’t enough, and I’ll recommend surgery to either reattach the fragment or replace the damaged area with a graft, depending on what the bone quality allows.
