Growth Plate (Physeal) Fractures
The growth plate, or physis, is a region of specialized cartilage located near the ends of long bones. It plays a vital role in a child’s bone development, controlling both the length and shape of growing bones. On an X-ray, the physis appears as a dark line because cartilage has not yet calcified like mature bone.
As a child matures and growth slows, the physis gradually hardens and transforms into solid bone — a process called epiphyseal closure. Generally, girls finish growing around age 14, while boys continue until about age 16, though these ages can vary widely based on genetics, nutrition, and overall health.
Why Growth Plates Are Vulnerable
Because the cartilage of the growth plate is softer and less dense than surrounding bone, it is more prone to injury. In fact, the physis is often weaker than the ligaments that connect bones, meaning a force that might sprain an adult’s joint can actually fracture a child’s growth plate instead.
Despite this vulnerability, growth plates are highly active tissue, and injuries here usually heal quickly — provided they are treated promptly. However, if a fracture is not realigned correctly within the first 5 to 7 days, early healing can make later correction more difficult.
Common Causes
Physeal fractures account for 15–30% of all pediatric fractures, making them a frequent reason for orthopedic evaluation. They occur most commonly in the fingers, wrist, and lower leg, where rapid growth and high activity levels make injuries more likely.
Typical causes include:
- Acute trauma, such as falls, sports injuries, or accidents.
- Repetitive stress, seen in young athletes like gymnasts, pitchers, or dancers, where micro-injuries accumulate over time.
- Twisting or impact injuries, especially in contact or high-impact sports.
- Crush injuries or direct blows to a limb, though less common, can severely damage the growth plate and surrounding structures.
Symptoms
The symptoms of a growth plate fracture can range from subtle to obvious, depending on the severity and location of the injury. Common signs include:
- Pain and tenderness localized to the joint or bone end.
- Swelling or warmth over the affected area.
- Difficulty bearing weight or moving the limb normally.
- Visible deformity if the fracture causes displacement.
- Changes in limb alignment or function, particularly after the initial swelling subsides.
In some cases, symptoms may be mild and mistaken for a sprain, which is why persistent pain near a joint in a growing child should always be evaluated by a healthcare provider.
Diagnosis
A physical examination is usually followed by X-rays of the injured area. Because the growth plate itself is made of cartilage and doesn’t appear clearly on standard X-rays, doctors often compare images of both limbs to spot subtle differences. In complex cases, MRI or ultrasound may be used to better visualize cartilage damage or associated soft-tissue injuries.
Growth plate fractures are classified using systems like the Salter-Harris classification, which describes the type and severity of the fracture and helps guide treatment.
Treatment
Treatment depends on the type, location, and displacement of the fracture:
- Immobilization:
Minor, stable fractures are typically treated with a cast or splint, allowing the physis to heal naturally. - Closed reduction:
If the bones are misaligned, the doctor may perform a gentle realignment under sedation before immobilization. - Surgical fixation:
More serious or unstable fractures may require pins, screws, or plates to hold the bone in place while healing. These procedures aim to restore precise alignment to prevent growth disturbances.
Prompt treatment by an orthopedic specialist — ideally within 5 to 7 days of injury — is crucial, as the growth plate begins healing quickly and can complicate correction if delayed.
Recovery and Outcomes
Children generally heal faster than adults, and most physeal fractures have excellent outcomes with proper care. Healing times vary depending on the child’s age and the bone involved, but typically range from 3 to 6 weeks.
After the cast is removed, temporary stiffness or weakness may occur, but normal activity can often resume once full motion and strength return.
However, some complications may occur, including:
- Growth disturbances, leading to uneven limb length or angular deformities.
- Partial growth arrest, where part of the growth plate stops functioning.
- Recurrent fractures if the bone remains weak during early recovery.
Regular follow-up X-rays are important to monitor bone growth, especially after more severe injuries.
Conclusion
Growth plate fractures are common but highly treatable injuries in children. Understanding their causes, symptoms, and the importance of timely orthopedic evaluation helps ensure proper healing and minimizes long-term complications. With prompt attention and appropriate care, most children recover fully and continue to grow normally.
Luskin Orthopaedic Institute for Children
Los Angeles's best in Pediatric Orthopaedic Care Since 1911
