S82.446M Nondisplaced spiral fracture of shaft of unspecified fibula, subsequent encounter for open fracture type I or II with nonunion

Name of the Condition

• Nondisplaced spiral fracture of shaft of unspecified fibula, subsequent encounter for open fracture type I or II with nonunion

Summary

A nondisplaced spiral fracture of the fibular shaft is a bone break with a helical pattern along the shaft of the fibula, where the bone fragments remain aligned. This fracture is classified as an open fracture type I or II (minimal soft tissue damage) and is associated with nonunion, meaning the fracture has not healed properly. It typically results from twisting forces applied to the leg and may cause persistent pain and limited mobility.

Causes

Most commonly caused by twisting injuries to the lower leg, such as those sustained during sports, falls, or accidents. High-impact trauma, including direct blows or rotational forces, can also lead to this type of fracture. Nonunion may occur due to inadequate immobilization, poor blood supply, infection, or other factors interfering with healing.

Risk Factors

• Participation in activities with high rotational stress (e.g., skiing, gymnastics).
• Osteoporosis or reduced bone density.
• Previous lower leg injuries or fractures.
• Advanced age, which may weaken bone strength.
• Smoking or other factors that impair bone healing.

Symptoms

• Persistent severe pain and swelling in the lower leg.
• Bruising and tenderness at the fracture site.
• Inability to bear weight on the affected leg.
• Possible deformity or instability of the leg.
• Delayed healing or lack of progress in fracture recovery.

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and deformity. X-rays are typically used to confirm the fracture and its spiral pattern, as well as to evaluate for nonunion (e.g., visible gap or sclerosis at the fracture site). Additional imaging, such as CT or MRI, may be ordered to assess soft tissue damage or bone healing status.

Treatment Options

Treatment may include surgical intervention to stabilize the fracture (e.g., internal fixation) or bone grafting to promote healing. Non-surgical options, such as prolonged immobilization or external fixation, may be considered depending on the case. Physical therapy is often recommended to restore function and strength.

Prognosis and Follow-Up

Prognosis depends on the success of treatment and the underlying factors contributing to nonunion. Regular follow-up with imaging is necessary to monitor healing progress. Full recovery may take several months, and some patients may experience long-term mobility limitations or require ongoing management.

Complications

• Persistent nonunion or delayed healing.
• Infection at the fracture site.
• Chronic pain or instability.
• Nerve or vascular damage.
• Reduced mobility or functional impairment.

Lifestyle & Prevention

• Avoid high-impact or rotational activities until cleared by a healthcare provider.
• Ensure proper nutrition, including adequate calcium and vitamin D, to support bone health.
• Use protective equipment during sports or activities with fall risks.
• Follow post-treatment guidelines for immobilization and weight-bearing restrictions.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, swelling, or deformity after an injury, or if you notice signs of infection (e.g., redness, warmth, or drainage) at the fracture site. Follow up with a healthcare provider if symptoms worsen or do not improve with treatment.

Tips for Medical Coders

Document the fracture type (open I or II), the presence of nonunion, and the subsequent encounter status clearly. Ensure clinical notes specify the fracture pattern (spiral), location (shaft of unspecified fibula), and any contributing factors to nonunion. Verify that the encounter is classified as "subsequent" and that open fracture details are accurately recorded.