S52.629 Torus fracture of lower end of unspecified ulna

Name of the Condition

• Torus fracture of lower end of unspecified ulna

Summary

A torus fracture of the lower end of the unspecified ulna is a stable, incomplete break in the distal portion of the ulna, one of the two bones in the forearm. This type of fracture typically occurs in children due to the flexibility of their bones and is characterized by a buckling or compression of the bone cortex without significant displacement. The injury often results from a fall onto an outstretched hand and may involve the wrist joint or adjacent soft tissues.

Causes

The most common cause is trauma, such as a fall onto an outstretched hand, a direct blow to the forearm, or high-impact injuries like sports-related incidents. The force transmitted through the wrist or elbow can lead to a buckling of the distal ulna, particularly in pediatric patients with more pliable bone structures.

Risk Factors

• Participation in contact sports or activities with a high risk of falls (e.g., gymnastics, skateboarding)
• Pediatric age group, as children’s bones are more prone to torus fractures
• Osteoporosis or reduced bone density (less common in children but relevant in older populations)
• Previous forearm or wrist injuries
• Certain occupations or hobbies involving repetitive stress or heavy lifting

Symptoms

• Mild to moderate pain at the injury site
• Swelling or tenderness over the distal ulna
• Limited range of motion in the wrist or forearm
• Possible bruising or deformity (if displacement occurs, though rare)

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays, are used to confirm the fracture and rule out other injuries. The characteristic buckling of the bone cortex without significant displacement is a key diagnostic feature. In some cases, additional imaging (e.g., CT or MRI) may be ordered to evaluate associated soft tissue damage or joint involvement.

Treatment Options

Treatment usually focuses on immobilization with a cast or splint to allow the bone to heal. Pain management may include over-the-counter or prescription medications. For severe cases or those with associated injuries, surgical intervention may be required. Physical therapy is often recommended during recovery to restore strength and mobility.

Prognosis and Follow-Up

Prognosis is generally favorable, with most fractures healing completely within 4–6 weeks. Follow-up appointments are important to monitor healing and adjust treatment as needed. Long-term complications are rare, but regular monitoring ensures proper recovery and addresses any potential issues early.

Complications

• Delayed healing or nonunion (rare)
• Malunion (abnormal healing)
• Associated soft tissue injury or nerve damage
• Chronic pain or stiffness in the wrist or forearm

Lifestyle & Prevention

• Use protective gear during high-risk activities (e.g., wrist guards for sports)
• Ensure proper technique and supervision for children during physical activities
• Maintain bone health through a balanced diet and regular exercise (especially important for older adults)
• Avoid falls by using assistive devices if needed, particularly in populations with balance issues

When to Seek Professional Help

Seek medical attention if pain is severe, swelling worsens, or there is an inability to move the wrist or forearm. Immediate care is also recommended if the injury is accompanied by numbness, tingling, or visible deformity, as these may indicate nerve or vascular involvement.

Tips for Medical Coders

Document the specific location (unspecified ulna) and confirm the fracture type (torus) to ensure accurate coding. Include details about the mechanism of injury, patient age, and any associated symptoms or treatments, as these may impact coding specificity. Verify that the fracture is stable and incomplete, as this distinguishes it from more complex injuries.