Radius Fracture

A radius fracture is one of the most common breaks in the arm, particularly near the wrist. This injury can happen to anyone—from children falling on the playground to older adults experiencing a simple stumble. Understanding what happens when your radius breaks and how it heals can help you navigate the recovery process more confidently.

Table of contents

• What Is a Radius Fracture?
• Understanding the Forearm Anatomy
• How Radius Fractures Happen
• Different Types of Radius Fractures
• Signs and Symptoms
• How Doctors Diagnose Radius Fractures
• Treatment Options
• The Recovery Process
• Possible Complications

What Is a Radius Fracture?

A radius fracture is a break in the radius bone, one of the two long bones in your forearm. The most common type is a distal radius fracture, which occurs near the wrist, typically about one inch from the end of the bone.^[1] This is actually the most frequently broken bone in the arm.^[1]

While many people refer to this injury as a “broken wrist,” it’s actually a fracture of the forearm bone close to the wrist joint.^[3] The distal radius is especially vulnerable to breaking because it makes up approximately 80% of the wrist joint surface and bears extreme loads when people fall on their outstretched hands.^[3]

Understanding the Forearm Anatomy

Your forearm contains two long bones that connect your hand to your elbow. The radius is the larger bone located on the thumb side of your forearm. The ulna is the other bone, positioned on the small finger (pinky) side.^[1]

At the elbow end of the forearm (called the proximal forearm), the ulna is larger. However, at the wrist end (called the distal forearm), the radius becomes the larger bone.^[1] The unique design of the radius allows for wrist motion and forearm rotation, making it essential for everyday activities.^[3]

• Radius bone
• Ulna bone
• Wrist joint
• Forearm
• Elbow joint

How Radius Fractures Happen

The most common way people break their radius is through a fall onto an outstretched hand, often abbreviated as FOOSH (Fall On OutStretched Hand).^[4][5] When you instinctively put your hands out to catch yourself during a fall, the radius bone takes the impact and can break under the force.

The circumstances of these falls differ by age group. In young people, radius fractures typically result from high-energy accidents such as falls from ladders, car crashes, or injuries during sporting events.^[1][5] Children and adolescents often sustain these injuries on playgrounds or while participating in sports.^[5]

In older adults, especially those with osteoporosis (a condition where bones become weak and brittle), distal radius fractures can occur from a simple fall from a standing or seated position.^[1][5] These low-energy falls can still cause significant fractures because the bones are more fragile. The rate of distal radius fractures is nearly double in people younger than 18 years and older than 65 years.^[4]

Radius fractures can also result from direct blows to the forearm, particularly in cases of isolated midshaft ulna fractures (sometimes called nightstick fractures).^[4]

Different Types of Radius Fractures

Radius fractures can break in many different ways, and doctors classify them based on several characteristics. Understanding the type of fracture helps determine the best treatment approach.^[3]

One of the most common types is a Colles fracture, where the broken fragment of the radius tilts upward.^[1][3] This fracture was first described in 1814 by an Irish surgeon and anatomist named Abraham Colles. Colles fractures typically occur when you fall on an outstretched hand with your hand extended backward on the wrist.^[3]

A Smith fracture is essentially the opposite of a Colles fracture. In this case, the broken fragment tilts downward, usually caused by falling with the hand flexed forward under the wrist.^[3]

In children, two specific types of fractures are common. A buckle fracture (also called a torus fracture) is an incomplete compression fracture without complete disruption of the bone’s outer layer (cortex). The cortex bulges outward, but the integrity of the bone is minimally compromised.^[4][8] A greenstick fracture has cortical disruption and is also common in children.^[4]

Fractures can also be classified by how the break affects the bone structure:

• Intra-articular fracture: The break extends into the wrist joint. This type has a worse prognosis because it can cause damage to the cartilage and potentially lead to arthritis.^[1][3]
• Extra-articular fracture: The break does not extend into the joint.^[1]
• Open fracture: The broken bone breaks through the skin. These require immediate medical attention because of the risk of infection.^[1]
• Comminuted fracture: The bone is broken into more than two pieces.^[1]
• Displaced fracture: The broken pieces of bone do not line up straight.^[1]

Sometimes the ulna is also broken along with the radius. Depending on the type of ulna fracture, you may or may not require additional treatment.^[1]

Signs and Symptoms

When you break your radius, several symptoms typically appear immediately. The most common signs include:

• Immediate pain and swelling around your wrist or forearm^[3]
• Tenderness directly over the fracture site^[8]
• Limited range of motion in the wrist and hand^[8]
• Bruising that happens right away^[20]
• The wrist may look crooked or deformed^[20]
• Numbness or tingling, which can occur if the fracture affects nearby nerves^[3]

The degree of deformity depends on how much the fracture has displaced the bone. Buckle injuries, for example, present with minimal or no deformity, and they are often misdiagnosed as wrist sprains.^[8] If the bone breaks through the skin in an open fracture, external bleeding and infection can also occur.^[20]

Moving your wrist, especially twisting or gripping, typically makes the pain worse.^[3] It’s important to note that radius fractures may be complicated by median nerve injury, which can cause additional symptoms in the hand and fingers.^[4]

How Doctors Diagnose Radius Fractures

If you suspect a radius fracture, seeking medical evaluation is important. Doctors typically use imaging tests to confirm the diagnosis and determine the type of fracture.

The most common diagnostic tool is an X-ray, which uses radiation to create pictures of the inside of your body.^[8] For a wrist injury, doctors will order X-rays that provide views of the distal forearm and wrist from different angles. If the injury is to the mid-forearm or the pain is poorly localized, a full forearm X-ray may be ordered.^[8]

Ultrasonography is an alternative to X-rays for detecting forearm fractures, with a sensitivity of 97% and specificity of 95%.^[4] This means it’s very accurate at identifying fractures.

If initial imaging findings are negative but suspicion of fracture remains, doctors may recommend splinting and repeat X-rays in seven to 14 days.^[4] Sometimes fractures don’t show up clearly on the first X-ray but become more visible as healing begins.

In some cases, particularly for complex fractures, additional imaging such as CT scans (computed tomography) or MRI (magnetic resonance imaging) may be ordered to get a more detailed view of the bone and surrounding tissues.

Treatment Options

Treatment for a radius fracture depends on several factors, including the type and severity of the fracture, the patient’s age and overall health, and their activity level.^[12] The goal of all treatment is to restore the patient to their prior level of functioning.^[14]

Non-Surgical Treatment

If your fracture isn’t too severe and the bones are still in decent alignment (not displaced or only minimally displaced), you may only need immobilization with a cast or splint.^[12] The cast or splint keeps everything stable so your bones can heal naturally.

For adults with distal radius fractures, the initial treatment typically involves a sugar-tong splint, which is then followed by a short-arm cast.^[4] Recent evidence suggests that immobilizing nondisplaced distal radius fractures for three weeks rather than the traditional six weeks may be sufficient.^[4]

For children with buckle fractures, treatment involves below-elbow immobilization for three weeks using various options including removable splints, wraps, or soft casts.^[4][8] There’s no evidence that one option is better than another.^[4] Complete but undisplaced fractures in children are typically treated with a below-elbow cast for six weeks.^[8]

During the immobilization period, it’s important to keep the cast or splint dry and elevated, especially in the first few days, to reduce swelling.^[18] Applying ice can also help stop swelling and relieve pain, though you must be careful to keep your cast dry by wrapping the ice pack in a towel.^[18]

Surgical Treatment

When the bones need more help to heal properly—such as when they are significantly displaced, involve the joint surface, or have multiple fragments—surgery may be necessary.^[12] Surgery is aimed at ensuring your wrist heals strong and stable by repositioning the bones correctly.

Surgeons may use different techniques depending on the fracture pattern:

• K-wires (pins): Thin metal wires inserted through the skin to hold bone fragments in place, commonly used in children^[12]
• Plates and screws: Metal hardware attached to the bone to hold it in the correct position, typically used in adults^[12][19]
• External fixation: A frame outside the body connected to the bone with pins to hold everything stable^[23]

The wrist is often fixed with a titanium plate and screws, which may require 6 to 10 screws depending on the fracture pattern.^[19] After surgery, a splint or cast is usually placed to protect the repair until the first postoperative visit.^[19]

Indications for surgical treatment include displaced fractures with more than 30 degrees of angulation or more than 50% displacement in children, and various factors in adults including concurrent dislocations, unstable fracture patterns, or involvement of important ligaments.^[4]

The Recovery Process

Recovery from a radius fracture follows a structured process and varies depending on the treatment approach and the individual patient. Healing typically occurs in three phases: inflammation (0-7 days), repair (1-6 weeks), and remodeling (6+ weeks).^[21]

Healing Time

For non-surgical treatment, bones typically take around six weeks to heal enough to remove the cast in adults, though complete healing can take a few months.^[16] In young children, healing is often faster, taking about four weeks for the bone to heal adequately.^[12]

After surgery, the recovery period may be slightly longer because your body needs time to recover from the procedure itself.^[16] Pins used in children are typically removed at six weeks, with any additional wires removed two weeks later.^[23] Plates and screws used in adults usually do not need to be removed.^[19]

The wrist and arm should be functional for most activities by 8 to 10 weeks after surgery, with most patients able to resume heavier activities and sports after about 3 to 6 months.^[23]

Physical Therapy and Exercise

Whether you have surgery or not, physical therapy is essential to your recovery.^[16] The importance of therapy, especially in adults, cannot be emphasized enough—failure to follow through with a well-planned therapy routine can lead to problems such as stiffness and loss of function.^[12]

Physical therapy helps by:

• Maintaining joint flexibility to prevent restricted movement^[21]
• Enhancing blood flow to facilitate bone healing^[21]
• Strengthening surrounding muscles and ligaments^[21]
• Reducing the risk of long-term complications such as stiffness and weakness^[21]

While in the cast or splint, it’s important to move your shoulder, elbow, and fingers regularly to prevent stiffness at these joints.^[22] Once the cast is removed, exercises focus on regaining flexibility, then building strength, and finally returning to normal activities.^[16]

After the cast or splint is removed, it’s normal for the wrist to be stiff for 1 to 2 months.^[23] For some patients—particularly those who are older, have osteoarthritis, or experienced high-energy trauma—this stiffness may last up to two years.^[23]

Pain Management

Several pain management techniques can help during recovery:

• Prescription pain medications (opioids) may be prescribed for a short period after reduction or surgery^[23]
• Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or naproxen can manage pain and inflammation^[23]
• Over-the-counter pain relievers like acetaminophen^[19]
• Ice therapy for 5 to 10 minutes every hour^[23]
• Elevation of the wrist above heart level to reduce swelling^[18]

Follow-Up Care

Regular follow-up appointments are important to monitor healing. For surgical patients, the first visit is typically scheduled 10 to 14 days after surgery, with subsequent visits at 6 weeks and 3 months.^[19] At these appointments, the provider will examine you and take X-rays to follow bone healing.^[19]

If the fracture has been reset without surgery, you may still need periodic X-rays to make sure the bone is healing correctly.^[23]

Returning to Activities

You should not lift more than a cup of coffee for the first six weeks after surgery.^[19] You will not be insured to drive while wearing a cast or splint, and it’s generally safe to return to driving when you can comfortably grip the steering wheel, move the gear stick, and perform an emergency stop without pain.^[22]

Being compliant with physical therapy almost always leads to good outcomes, with most people able to return to a full level of activity about three weeks after therapy starts and achieve full or near-full range of movement in about three months.^[12]

Possible Complications

While most radius fractures heal well with appropriate treatment, some potential complications can occur. The chances for complications vary based on the patient’s condition and the treatment approach used.^[23]

Possible complications include:

• Malunion: When the bone heals in an incorrect position, causing continued deformity^[23]
• Residual pain and stiffness^[23]
• Compromised function or strength in the hand or wrist^[23]
• Post-traumatic arthritis in the wrist, particularly with intra-articular fractures^[23]
• Injuries to nerves, tendons, or other soft tissues^[23]
• Infection, especially with open fractures^[1]
• Problems with plates, screws, or pins used in surgery^[23]

Factors that can delay healing include smoking, which should be avoided as it significantly impacts the healing process.^[22] If you are diabetic, keeping blood sugar well controlled is important, as high blood sugar can increase the risk of infection, wound complications, and the bone not healing properly.^[19]

Lifestyle factors can also impact recovery. Consuming a balanced diet with dairy products, leafy greens, and protein-rich foods can enhance bone repair.^[21] Avoiding excessive alcohol is also important, as it can interfere with bone regeneration.^[21] Staying hydrated and engaging in safe rehabilitation exercises can further promote successful recovery.^[21]