M84.331 Stress fracture, right ulna

Name of the Condition

• Stress Fracture, Right Ulna

Summary

A stress fracture of the right ulna is a small crack or severe bruising within the right ulna bone, typically resulting from repetitive force or overuse. This injury occurs when the bone's ability to repair itself is exceeded by mechanical stress, often affecting bones in the forearm.

Causes

Stress fractures develop due to repeated mechanical stress on the ulna that outpaces its natural repair process. Common causes include increased physical activity, improper training techniques, and inadequate rest between activities.

Risk Factors

• Participation in high-impact sports (e.g., throwing, racquet sports)
• Sudden increase in physical activity level
• Poor nutrition, including insufficient calcium or vitamin D
• Low bone density or osteoporosis
• Overuse from repetitive forearm motions

Symptoms

• Pain in the right forearm that worsens with activity
• Swelling and tenderness around the fracture site
• Pain that diminishes with rest
• Limited range of motion in the wrist or elbow

Diagnosis

Diagnosis involves a physical examination by a healthcare provider, followed by imaging tests such as X-rays, MRI, or bone scans to confirm the fracture. Early stress fractures may not be visible on standard X-rays.

Treatment Options

• Rest and avoiding activities that exacerbate the injury
• Ice application to reduce swelling and pain
• Protective bracing or casting to stabilize the bone
• Gradual return to activity with proper conditioning
• Pain management as needed

Prognosis and Follow-Up

Most stress fractures of the ulna heal with proper rest and treatment, typically within 6–8 weeks. Follow-up care may include monitoring for healing progress and gradual resumption of activities to prevent recurrence.

Complications

• Delayed healing or nonunion if not properly managed
• Progression to a complete fracture with continued activity
• Chronic pain or functional limitations

Lifestyle & Prevention

• Gradually increase physical activity to avoid overuse
• Ensure proper nutrition, including adequate calcium and vitamin D
• Use appropriate equipment and technique during sports or repetitive tasks
• Incorporate rest periods into training regimens

When to Seek Professional Help

Seek medical attention if pain persists despite rest, worsens, or is accompanied by swelling, bruising, or inability to bear weight on the affected arm.

Tips for Medical Coders

Document the specific site (right ulna) and confirm the diagnosis with clinical findings or imaging. Ensure the code M84.331 is used when the stress fracture is localized to the right ulna.