Introduction of transversefracture

A transverse fracture is a type of bone fracture which is characterised by a perpendicular break in the bone along its length. It appears as a clear straight line and is common in long bones of children, such as the femur (thigh bone), forearm bones (radius and ulna), and tibia (shin bone). 

Fractures are common in children, occurring in approximately 50% of boys and 40% of girls. Evaluating fractures in children can be challenging due to the difficulty in distinguishing between traumatic and pathological fractures. A comprehensive medical history and physical examination are essential for an accurate diagnosis. Understanding these distinctions is crucial for identifying underlying risk factors and developing effective preventive strategies. 

This article explores the unique considerations associated with transverse fractures in children, with a particular focus on growth plate involvement.

What are the differences between pediatric and adult bones?

There are anatomical differences in adult and paediatric bones. 

The long bones in children are divided into four regions:¹

1. Diaphysis – the shaft, or primary ossification centre
2. Metaphysis – found between the epiphysis and diaphysis
3. Physis (Growth Plate) – a key cartilage layer responsible for bone growth only found in children
4. Epiphysis – the secondary ossification centre at the bone ends

The epiphysis and physis are cartilage structures at the ends of long bones. As a child grows, these areas gradually harden and fuse with the rest of the bone. 

Growth plate and its significance

During maturation, the growth plate undergoes several changes. Being cartilaginous, the cartilage cells (chondrocytes) progress through different stages to mature into bone.² 

The growth plate is the weakest part of a child's bone and helps distinguish immature bone from mature bone. In the hypertrophic zone, cartilage cells die, leaving behind a hardened matrix. Blood vessels bring in cells like osteoblasts and osteoclasts that help form and break down bone for growth.²

Causes and risk factors of transverse fractures in children

Most frequently, fractures occur in children and the elderly, weakening the bones in old age and affecting the growth plates in youth. By the time they are 17, about one-third of kids have had at least one fracture, which accounts for 9% of all paediatric injuries treated in hospitals.^5,4

The leading causes of bone fractures in children are sports (39%) and play (37%), with play being the primary cause in the first decade of life, while sports-related injuries become more prevalent in teenagers.⁶ 

About 20% of all fractures in skeletally immature patients involve the growth plate, and they peak in boys aged 13–14 and girls aged 11–12.¹⁰ 

Forearm, femur, and tibia fractures are the most frequent long bone fractures in children.¹¹

Typical reasons for fractures in children 

Trauma

The main causes are direct blows, car crashes, sports injuries, and falls. Older children are injured by playground equipment, bikes, and sports. Younger children frequently fall from stairs or furniture as they are in their dramatic development phase of motor skills.⁶ Stress or fatigue fractures can develop over time due to repetitive strain, rather than a single traumatic event.

Sports injuries 

As kids start participating in organised sports like football, basketball, and gymnastics after the age of five, the number of fractures from sports starts to increase.⁶

Child abuse

Multiple fractures in infants and non-ambulatory toddlers may be a sign of abuse. Particularly those in different stages of healing.

Medical conditions

Conditions such as osteoporosis weaken bones, making fractures more likely. Since childhood, osteoporosis can have various underlying causes; a thorough evaluation by a specialist is essential to identify factors contributing to bone fragility.⁷

Risk factors

Age & activity level

Older, more active children, especially those involved in sports, have a higher risk of fractures.

Child abuse

Infants and toddlers, particularly those with femoral fractures, are at higher risk of abuse related injuries.

Low bone density 

Conditions like osteopenia weaken bones, making fractures more likely.

Nutritional deficiencies 

Lack of calcium or vitamin D can lead to weaker bones and increased fracture risk.⁹

Genetic conditions

Disorders, including osteogenesis imperfecta, causes fragile bones, raising fracture susceptibility.

Medical conditions

Chronic illnesses such as kidney or liver disease, or long-term corticosteroid use, can negatively impact bone health.⁸

Growth plate involvement in transverse fractures

While both children and adults face similar injury risks, developing bones break differently. Additionally, since growth plates are the last to solidify, they are highly vulnerable to injury.

Based on their severity and involvement of the growth plate, metaphysis, and epiphysis, growth plate fractures, also referred to as Salter-Harris fractures, are divided into five types (I–V).¹²

The Salter-Harris fractures type I-V

Type I

 occur when the physis is broken, but the bone surrounding the growth plate is not affected. It represents 6% of all injuries to the physeal region.^12,13

Type II

The most common growth plate fracture occurs in 75% of physeal injuries. It involves a fracture through both the metaphysis and physis, with an oblique or vertical fracture through the metaphysis and a transverse fracture through the growth plate.^12,13

Type III

Occurs when fractures pass through the growth plate and epiphysis. As a result, the physis and epiphysis become distinct from the metaphysis.

Type IV

Occurs when the fractures penetrate the epiphysis, metaphysis, and physis.

Type V

Rare compression fracture where the bone end is crushed and the physis is compressed. It's difficult to detect on X-rays.¹³

Diagnosis and imaging

The most common growth plate fracture symptoms include:

• Pain, swelling, and tenderness at the injury site
• Difficulty bearing weight or moving the affected limb
• Visible deformity in severe cases

Imaging techniques

Doctors diagnose growth plate injuries using X-rays, though they can be hard to interpret due to the soft cartilage. MRI provides detailed images of cartilage, and CT scans help assess complex fractures. Physical exams are also crucial, as minor fractures may not show on imaging.^16,17

A physical examination remains crucial including assesement of a child's behaviourirritable, tearful, guarding, as minor fractures may not appear on imaging, and a pediatric specialist can differentiate normal growth variations from actual fractures.⁸

Treatment and management

The treatment for a growth plate fracture depends on severity. Mild fractures may require a cast or splint, while severe ones may need surgery for realignment.

Treatment includes:^15,17,18

• Immobilisation: Casts or splints for mild fractures or manual realignment
• Surgical Intervention: Surgery with screws, plates, or pins for unstable fractures
• Follow-up Care: Regular check-ups and X-rays to monitor healing; physical therapy may be recommended for strength and motion recoveryPrognosis and Complications

Most growth plate fractures heal well with proper treatment, but complications including uneven bone growth, limb length discrepancies, or angular deformities can occur. Early intervention, regular monitoring, and appropriate treatment help minimise these risks.

Prognosis

Generally positiveas most growth plate fractures heal without lasting effects.

Factors Influencing Prognosis

• Severity of the injury
• Type of fracture
• Age
• Location of the fracture
• Early diagnosis and treatment

Potential Complications of Growth Plate Damage

A growth plate injury can affect height and alignment. In areas with parallel bones, like the wrist, if one bone stops growing while the other continues, angular deformities may occur. 

Younger children are more affected due to still growing, while older children are less impacted.¹⁴

However, potential complications can include:¹⁵

• Malunion: When the broken bone doesn’t heal correctly or align properly
• Nonunion: If the bone doesn’t fully heal or doesn’t heal at all
• Stunted Growth: In rare cases, severe fractures, especially type 5, can affect future bone growth, leading to shorter or smaller bones. Surgery may be required to prevent this

Prevention and Parental Guidance

• Growth plate fractures can be avoided by taking a number of preventative steps to lower the chance of harm. It is crucial to encourage kids to participate in safe sports activities, such as donning protective gear and using the right techniques
• Frequent physical conditioning and exercise can also help strengthen the bones, reducing the risk of fractures. Promoting bone health and resilience requires leading a healthy lifestyle that includes eating a balanced diet high in calcium and vitamin D

Additionally, reducing the risk of falls and accidents can be achieved by making both residential and recreational spaces safe.

Summary

Transverse fractures in children, common in long bones, can involve the growth plate, leading to potential complications including uneven bone growth or limb length discrepancies. 

Early treatment, including immobilisation or surgery, improves recovery. Preventive measures like safe sports practices, proper nutrition, and injury-proof environments help reduce fracture risks.