S52.629P Torus fracture of lower end of unspecified ulna, subsequent encounter for fracture with malunion

Name of the Condition

• Torus fracture of lower end of unspecified ulna, subsequent encounter for fracture with malunion

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 is characterized by a buckling or compression of the bone cortex without significant displacement. It typically occurs in children due to the flexibility of their bones and is often the result of trauma, such as a fall onto an outstretched hand. The "subsequent encounter" designation indicates this is a follow-up visit for a fracture that has healed with malunion, meaning the bone has healed in a misaligned position, which may affect function or require further intervention.

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. Malunion may occur if the initial fracture was not properly aligned or immobilized during healing.

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
• Inadequate immobilization or premature weight-bearing during initial healing

Symptoms

• Persistent pain or discomfort at the injury site, even after initial healing
• Visible or palpable deformity due to misalignment of the healed bone
• Reduced range of motion in the wrist or forearm
• Functional limitations, such as difficulty gripping or lifting objects
• Possible swelling or tenderness over the malunited area

Diagnosis

Diagnosis is confirmed through clinical evaluation and imaging studies. A physical examination may reveal deformity or limited mobility. X-rays or other imaging (e.g., CT scans) are used to assess the alignment of the healed bone and identify malunion. The "subsequent encounter" context indicates the fracture has progressed beyond the initial healing phase, and imaging helps determine the extent of misalignment and its impact on function.

Treatment Options

Treatment depends on the severity of malunion and functional impact. Options may include:

• Observation if the malunion is minor and does not affect function
• Physical therapy to improve range of motion and strength
• Orthotic devices or braces to support the wrist and forearm
• Surgical intervention, such as osteotomy (realignment of the bone) or hardware placement, for significant deformity or functional impairment

Prognosis and Follow-Up

Prognosis varies based on the degree of malunion and treatment. Minor malunions may have little long-term impact, while severe cases could lead to chronic pain or reduced mobility. Follow-up care focuses on monitoring function, managing symptoms, and determining if further intervention is needed. Regular assessments help track healing progress and adjust treatment plans as necessary.

Complications

• Chronic pain or discomfort due to misalignment
• Reduced range of motion or functional limitations
• Increased risk of future fractures in the affected area
• Potential need for additional surgeries to correct malunion
• Long-term joint stiffness or arthritis in the wrist or elbow

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider
• Use protective gear (e.g., wrist guards) during sports or activities with fall risks
• Follow immobilization and weight-bearing guidelines during initial fracture healing
• Engage in strength and flexibility exercises as recommended to support recovery
• Maintain bone health through adequate nutrition (e.g., calcium, vitamin D)

When to Seek Professional Help

Seek medical attention if you experience:

• Worsening pain or swelling at the injury site
• New or increasing deformity
• Inability to move the wrist or forearm normally
• Signs of infection (e.g., redness, warmth, fever)
• Persistent functional limitations despite conservative treatment

Tips for Medical Coders

This code (S52.629P) is used for a torus fracture of the lower end of the unspecified ulna during a subsequent encounter where malunion is present. Documentation should clearly indicate the fracture type, location, and the presence of malunion. Ensure the encounter is classified as "subsequent" and that the malunion is explicitly noted to support accurate coding. Verify that the ulna is unspecified (not left or right) and that the fracture is of the lower end.