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Difficulty: MediumPediatric Musculoskeletal Disorders

Match each pediatric patient's clinical presentation with the most likely musculoskeletal diagnosis.

  • An obese 13-year-old male presents with 4 weeks of vague right knee pain. Examination shows his right hip obligately externally rotates when it is passively flexed.Slipped capital femoral epiphysis
  • A 6-year-old male is evaluated for a progressive, painless limp. Examination shows atrophy of the proximal right thigh musculature and restricted internal rotation of the right hip.Legg-Calvé-Perthes disease
  • A 4-year-old female presents with sudden refusal to walk. She has a temperature of 39.0°C (102.2°F), an ESR of 55 mm/hr, and holds her hip flexed, abducted, and externally rotated.Septic arthritis
  • A 5-year-old male develops a limp 10 days after a mild upper respiratory infection. He is afebrile, can bear some weight, and inflammatory markers are within normal limits.Transient synovitis
  • A 14-year-old male basketball player presents with worsening anterior knee pain. Examination reveals focal swelling and significant tenderness directly over the tibial tuberosity.Osgood-Schlatter disease

Answer

An obese 13-year-old with referred knee pain and obligate external rotation matches Slipped capital femoral epiphysis. A 6-year-old with a painless limp and thigh atrophy matches Legg-Calvé-Perthes disease. A 4-year-old with high fever, elevated ESR, and refusal to walk matches Septic arthritis. A 5-year-old with a post-viral limp and normal vitals matches Transient synovitis. A 14-year-old athlete with tibial tuberosity tenderness matches Osgood-Schlatter disease.
Each clinical vignette maps to a distinct pediatric musculoskeletal etiology. Diagnosis relies heavily on the patient's demographic profile (age, weight), chronicity of symptoms, presence of infectious signs (fever, ESR), and classic physical exam maneuvers (obligate external rotation, localized tuberosity tenderness).

Step-by-Step Solution

1
Evaluate the presentation of the 13-year-old with insidious knee pain and obligate external rotation.
Matches Slipped capital femoral epiphysis (SCFE).
SCFE typically affects obese adolescents and frequently presents with referred knee pain rather than hip pain. Obligate external rotation with flexion is highly specific.
2
Analyze the 6-year-old with a progressive, painless limp and muscle atrophy.
Matches Legg-Calvé-Perthes disease.
Avascular necrosis of the femoral head presents insidiously in younger school-age children, often without systemic symptoms, leading to disuse atrophy over time.
3
Assess the 4-year-old with fever, high ESR, and complete refusal to bear weight.
Matches Septic arthritis.
The presence of fever, significantly elevated inflammatory markers, and inability to bear weight meets the criteria for septic arthritis, a medical emergency.
4
Review the 5-year-old with a limp following a recent viral illness.
Matches Transient synovitis.
A post-viral, self-limiting limp without significant fever or elevated lab markers is the classic presentation of transient synovitis.
5
Examine the 14-year-old athlete with focal anterior knee pain.
Matches Osgood-Schlatter disease.
Traction apophysitis of the tibial tuberosity is common in active adolescents and presents with localized tenderness at the tendon insertion site.

Key Concept

Differentiation of pediatric limp and joint pain based on patient age, chronicity, inflammatory status, and specific physical examination findings.
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Topics

Pediatric Musculoskeletal Disorders

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