Courtesy: David Chafey III, Associate Professor, University of New Mexico Health Sciences
Albuquerque, New Mexico, United States

Principles in Diagnosis and Management of Pathologic Femur Fractures

Overview

• Educational session focused on recognizing and treating pathologic femur fractures in clinical practice.
• Emphasis on systematic diagnosis, surgical decision-making, and postoperative care strategies.

Learning Goals

• Understand differences between traumatic and pathologic femur fractures.
• Recognize common causes of pathologic fractures.
• Apply a structured approach to diagnosis and treatment.
• Understand postoperative considerations and complications.

Traumatic Versus Pathologic Femur Fractures

• Traumatic fractures usually result from high-energy mechanisms and often present with associated injuries.
• Pathologic fractures frequently occur with minimal trauma or simple activities.
• Pathologic fractures often have intact periosteum and may reduce easily with traction.
• Bone healing may be impaired in pathologic fractures due to underlying disease.

Importance of Clinical History

• A detailed history is essential before reviewing imaging.
• Important factors include prior cancer history, family history of malignancy, and systemic symptoms.
• Pain preceding the fracture suggests underlying pathology.
• Medication history and comorbidities may influence management.

Common Causes of Pathologic Femur Fractures

• Metastatic disease is the most frequent cause in adults.
• Primary bone tumors are less common but important to identify.
• Metabolic bone diseases such as osteoporosis and Paget disease can lead to fractures.
• Rare disorders such as osteopetrosis may also be responsible.

Metabolic Bone Disease

• Osteoporosis is the most common metabolic cause of pathologic fractures.
• Risk factors include advanced age, chronic steroid use, smoking, and poor nutrition.
• Fractures commonly occur in the spine, distal radius, and proximal femur.
• Management includes fracture stabilization and addressing bone health.

Paget Disease

• May involve multiple bones and increase fracture risk.
• Often associated with elevated alkaline phosphatase levels.
• Surgical treatment may involve increased bleeding risk.

Diagnostic Evaluation

• Plain radiographs of the entire affected bone are essential.
• Computed tomography scans may help identify primary malignancy.
• Laboratory evaluation should include metabolic profile and calcium levels.
• Further staging depends on suspected diagnosis.

Role of Biopsy

• A biopsy is required when the diagnosis is uncertain.
• Avoid reaming through a lesion without a diagnosis.
• Frozen section examination helps guide intraoperative decisions.
• A staged procedure is reasonable if frozen section is unavailable.

Metastatic Bone Disease

• Common primary cancers include breast, lung, prostate, kidney, and thyroid malignancies.
• The axial skeleton is most commonly involved, followed by the femur.
• Metastases below the elbow and knee are rare but possible.

Treatment Objectives

• Relieve pain and restore mobility.
• Provide durable fixation with minimal need for revision.
• Allow early weight bearing whenever possible.
• Facilitate ongoing cancer treatment.

Surgical Decision-Making

• Choice of treatment depends on diagnosis, life expectancy, bone quality, and lesion location.
• Internal fixation may be appropriate when bone stock is adequate.
• Arthroplasty is preferred when fixation is unlikely to succeed.
• Cement augmentation may improve stability in destructive lesions.

Fixation Strategies

• Intramedullary nails are commonly used and should protect the entire bone.
• Plates may be useful in selected fracture patterns.
• Retrograde nails may leave proximal bone unprotected.
• Adequate reduction remains essential even in pathologic fractures.

Arthroplasty Considerations

• Preferred for femoral neck fractures and severe bone destruction.
• Cemented implants often provide reliable fixation.
• Modular prostheses allow reconstruction in complex cases.

Postoperative Management

• Radiation therapy is often used for metastatic disease.
• Although radiation may delay healing, it improves pain control.
• Systemic therapy should be coordinated with oncology teams.

Complications

• Delayed union and nonunion are common due to poor bone biology.
• Implant failure may occur, especially without proper reduction.
• Infection risk may be increased in immunocompromised patients.

Special Situations

• Radiation-induced fractures may occur years after treatment.
• These fractures often require resection and reconstruction.
• Multidisciplinary care improves outcomes.

Key Takeaways

• A structured approach is essential for diagnosing pathologic femur fractures.
• Biopsy should be performed when diagnosis is uncertain.
• Surgical treatment should prioritize stability and function.

Postoperative care must address both fracture healing and underlying disease