A growth plate injury is damage to the soft, developing tissue near the ends of a child’s bones. These areas of cartilage, called growth plates, are responsible for bone lengthening during childhood and adolescence. Because the cartilage is softer and more vulnerable than surrounding ligaments and tendons, it’s a common injury site in kids. Growth plate injuries account for 15 to 30 percent of all childhood fractures, and the wrist (specifically the lower end of the radius bone) is the most frequently affected location.
What Growth Plates Do
Every long bone in a child’s body has two growth plates, one at each end. These thin layers of cartilage are organized into distinct zones, each contributing to the process of building new bone. As children grow, these plates continuously produce new cartilage that gradually hardens into solid bone, making the bone longer over time.
Growth plates begin forming before birth and remain active until they fuse into solid bone during adolescence. Girls typically finish growing between ages 13 and 15, while boys finish between 15 and 17. Until that fusion happens, the growth plate remains the weakest link in the skeletal chain. A force that would sprain a ligament or strain a tendon in an adult is more likely to fracture the growth plate in a child.
How These Injuries Happen
Growth plate injuries fall into two broad categories: acute trauma and overuse.
Acute injuries happen from a single event, like a fall, a collision during a sport, or a direct blow. These are the classic fractures that send kids to the emergency room with sudden pain and swelling.
Overuse injuries develop gradually. When a child repeats the same motion over and over without enough rest, the growth plate absorbs cumulative stress and becomes inflamed or damaged. This is especially common in kids who specialize in a single sport year-round, because they load the same joints and muscles without a break. Making matters worse, children’s bones grow faster than their muscles, creating uneven tension across joints that leaves growth plates particularly vulnerable to repetitive strain.
Several well-known overuse conditions involve growth plates:
- Little Leaguer’s elbow: Excessive throwing irritates the growth plate on the inner side of the elbow, causing pain at the bony bump where wrist muscles attach.
- Sever’s disease: Running and jumping stress the growth plate in the heel bone, making it one of the most common causes of heel pain in active children.
- Osgood-Schlatter disease: The quadriceps muscle pulls repeatedly on the growth plate just below the kneecap, causing pain, swelling, and tenderness at the top of the shinbone.
- Jumper’s knee (Sinding-Larsen-Johansson disease): Similar to Osgood-Schlatter, but the stress lands on the growth plate at the bottom of the kneecap instead.
Symptoms to Recognize
Growth plate injuries can look a lot like sprains or strains, which is part of what makes them tricky. The National Institute of Arthritis and Musculoskeletal and Skin Diseases lists these signs:
- Persistent pain and tenderness near the end of a bone, not the middle
- Swelling, warmth, or visible deformity at the joint area
- Difficulty bending or moving the limb normally
- Inability to bear weight or put pressure on the injured area
- A child who quietly stops playing or limits their own activity after an injury
That last point is worth paying attention to. Young children especially may not articulate their pain clearly. Instead, they simply stop using the arm or leg as much as they normally would. Any persistent pain near a joint in a growing child deserves a closer look, because what appears to be a sprain could actually be a growth plate fracture.
How Growth Plate Fractures Are Classified
Doctors classify about 90 percent of growth plate fractures using the Salter-Harris system, which has five types based on where and how the break occurs. The type matters because it predicts both the treatment approach and the risk of long-term complications.
Type I is a clean separation through the growth plate itself, with no bone fragments involved. It accounts for about 6 percent of growth plate injuries and often looks normal on X-rays, which can make diagnosis difficult.
Type II is the most common pattern. The fracture runs through the growth plate and breaks off a small piece of the bone shaft. Together, Type I and Type II injuries are generally treated without surgery.
Type III fractures cross through the growth plate and extend into the joint surface. These are more serious because both the growth plate and the joint are disrupted.
Type IV fractures cut across the bone shaft, through the growth plate, and into the joint. Like Type III, these typically require surgical repair to realign the bones precisely.
Type V is the rarest and most concerning. It’s a crush injury to the growth plate itself, compressing the cartilage rather than breaking the bone. These injuries are nearly invisible on initial X-rays and are almost always diagnosed later, after growth has already been affected.
Treatment Approaches
Treatment depends on the fracture type, its location, and how far the bones have shifted out of alignment. The goal in every case is to restore normal alignment and protect the growth plate while it heals.
For Type I and Type II injuries, treatment is usually nonsurgical. If the bones are displaced, the doctor repositions them (a procedure called reduction), then immobilizes the area with a cast or splint. Your child will need to avoid putting pressure on the injured limb during healing, and activity restrictions typically continue until the growth plate has recovered.
Type III and Type IV fractures usually require surgery because the fracture extends into the joint surface. Precise realignment is critical for both normal joint function and continued growth. The surgeon fixes the bone fragments in their correct position with small pins or screws.
Type V crush injuries are difficult to treat proactively because they’re rarely caught early. Management focuses on monitoring the child’s growth over time and addressing problems as they arise.
Long-Term Complications
Most growth plate injuries heal without lasting problems, particularly the milder types. But when the growth plate is significantly damaged, it can partially or fully stop producing new bone in that area. This is called a growth arrest.
If the entire growth plate stops working, the bone ends up shorter than it should be, creating a limb length difference. If only part of the growth plate is damaged, the healthy portion keeps growing while the injured section doesn’t. This uneven growth causes the bone to angle or curve as the child gets older.
Because these complications develop slowly over months or years, children who’ve had a growth plate injury need follow-up monitoring for at least two years after the injury. During these visits, doctors compare X-rays over time to check whether the bone is growing normally or whether a growth disturbance is forming.
When a growth arrest is caught early and involves less than half the growth plate, surgeons can sometimes remove the damaged tissue and insert material to prevent the bone bridge from reforming. When more than half the plate is affected, the options shift toward managing the consequences: stopping growth on the opposite limb to keep the legs or arms even, or surgically lengthening the shortened bone later.
Why Prompt Evaluation Matters
The biggest risk with growth plate injuries isn’t the fracture itself. It’s the possibility of missing one. Because the growth plate is made of cartilage, it doesn’t always show up clearly on X-rays. A Type I fracture can look completely normal on imaging, and a Type V crush injury is almost never visible initially. If a child has persistent pain and tenderness near a joint after an injury, the growth plate should be considered the source until proven otherwise, even if the X-ray appears clean. Early and accurate treatment gives the growth plate the best chance of healing without disrupting the years of bone growth still ahead.