What is the appropriate management for a 9-year-old child with a 5-day history of left knee pain localized to the lateral aspect of the patellar head, worsened by stair climbing and running?

Patellofemoral Pain Syndrome - Initiate Exercise Therapy with Education

This 9-year-old has classic patellofemoral pain syndrome (PFP), and you should immediately start knee-targeted exercise therapy combined with education, with hip strengthening added based on tolerance to loaded knee flexion. 1

Clinical Presentation Confirms PFP

The presentation is textbook for PFP in a pediatric patient:

• Peripatellar pain (sides of patella head) worsened by stair climbing and running
• Pain reduction with walking (lower load activity)
• 5-day duration with insidious onset
• Age-appropriate (common in adolescents and children) 2, 3

This pattern of activity-related anterior knee pain that worsens with loaded knee flexion activities is pathognomonic for PFP 4.

Initial Assessment Priorities

Before starting treatment, evaluate these specific features to guide intervention selection 1:

Subjective factors:

• Pain severity during specific activities (stairs, running, squatting)
• Fear of movement or activity avoidance
• Self-efficacy regarding symptom management

Objective impairments to assess:

• Hip and knee strength (particularly quadriceps and hip abductors)
• Single leg squat mechanics
• Tissue tolerance to loaded knee flexion
• Presence of quadriceps atrophy

Primary Treatment Algorithm

First-Line: Exercise Therapy + Education (Start Immediately)

Exercise prescription depends on symptom irritability 1:

• If child tolerates loaded knee flexion: Start knee-targeted quadriceps exercises immediately (especially if quadriceps atrophy present)
• If poor tolerance to loaded knee flexion: Begin with hip-focused exercises first, then progress to knee exercises as tolerance improves

Education must underpin all interventions 1:

• Explain that pain does not equal tissue damage
• Set realistic recovery timeframes (minimum 6 weeks before reassessing)
• Build confidence in the diagnosis
• Promote autonomy and reduce fear of movement

Supporting Interventions (Add as Needed)

Consider these adjuncts based on specific presentations 1:

• Patellar taping or manual therapy: Use when high symptom severity/irritability or significant fear of movement is hindering rehabilitation or quality of life
• Prefabricated foot orthoses: Only if treatment direction tests show symptom improvement during functional tasks with orthoses in place
• Movement/running retraining: If symptoms appear task-specific (e.g., excessive stride length during running)

Red Flags to Rule Out

While PFP is most likely, briefly assess for serious pathology 3, 5:

• No fever, night pain unresponsive to NSAIDs, or constitutional symptoms (would suggest infection/tumor)
• No acute trauma or effusion (would suggest fracture, ligamentous injury)
• No point tenderness over tibial tubercle (would suggest Osgood-Schlatter disease)

Plain radiographs are not necessary for typical PFP presentation but consider if conservative treatment fails after 6 weeks 4.

Common Pitfalls

• Starting with imaging instead of treatment: Radiographs are unnecessary for classic PFP and delay appropriate therapy 4
• Prescribing rest alone: This is insufficient; active exercise therapy is essential 1
• Using NSAIDs as primary treatment: These may provide short-term relief but do not address underlying neuromuscular dysfunction 4
• Abandoning treatment too early: Reassess only after minimum 6 weeks of consistent therapy 1

Reassessment Strategy

If no favorable outcomes after 6 weeks 1:

• Revisit initial assessment findings
• Ensure interventions align with clinical reasoning
• Review patient engagement and adherence
• Consider whether supporting interventions need adjustment

The vast majority of pediatric patients with PFP respond to nonoperative measures targeting neuromuscular control and kinetic chain dysfunction 3. Surgery is considered only as a last resort after exhausting conservative options 4.