Orthopedic Board Exam Prep: High-Yield MCQ Practice for Residents & Surgeons
Key Takeaway
Our Orthopedic Board Exam prep platform provides interactive multiple-choice questions (MCQs) designed to simulate the actual exam. Users can practice in Study Mode for detailed explanations or challenge themselves in Exam Mode. Focus on high-yield topics like complex shoulder pathologies and surgical interventions, ensuring comprehensive preparation for residents and practicing surgeons aiming for board certification.
A 4-year-old child presents with a painless limp. Examination reveals limited abduction and internal rotation of the hip. You are shown the following clinical image.
Based on the clinical and radiographic findings, what is your most likely diagnosis, and what are the clinical stages of this condition?
Candidate: The most likely diagnosis is Legg-Calvé-Perthes disease (idiopathic AVN of the femoral head). The stages are commonly described using the Waldenström classification: 1) Initial/Necrotic stage, 2) Fragmentation stage, 3) Reossification stage, and 4) Healed/Remodeling stage.
Failing to mention the specific age-related differentials for a limp in a child (e.g., transient synovitis, septic arthritis, DDH). Candidates also often confuse Waldenström stages with radiographic classification systems like Herring (Lateral Pillar) or Catterall, which are used for prognosis rather than staging the disease process.
Start by categorizing the presentation: a child with a painless limp, limited hip abduction, and internal rotation. State the diagnosis is Legg-Calvé-Perthes disease. Structure the clinical stages clearly using the Waldenström classification:
1. Initial (Necrosis): Increased density of the epiphysis.
2. Fragmentation: Resorption of the necrotic bone.
3. Reossification: New bone formation appears.
4. Remodeling: Restoration of shape.
Conclude by briefly mentioning that prognosis is guided by the Herring Lateral Pillar Classification, noting that "B" and "C" involvement significantly impacts the final sphericity of the femoral head.
