Imaging and Management Recommendations for Unilateral Knee Pain with Potential Contralateral Involvement

Imaging Assessment

Obtain bilateral knee radiographs (AP, lateral, tunnel/Rosenberg, and patellar tangential views) for any patient presenting with unilateral knee pain, because asymptomatic contralateral pathology can be biomechanically significant. [American College of Radiology] 1
If knee radiographs are unremarkable, acquire hip radiographs to exclude referred hip pathology as a source of knee pain. [American College of Radiology] 2
When plain radiographs are normal but pain persists, order magnetic resonance imaging (MRI) to detect occult meniscal, ligamentous, or other intra‑articular lesions. [American College of Radiology] 1

Implement structured physical‑therapy programs that strengthen the quadriceps muscles of both knees, even when pain is reported only on one side. [American Academy of Orthopaedic Surgeons] 3
Advise weight reduction for patients with elevated body‑mass index, targeting a BMI < 28 kg/m² to lessen joint loading and reduce risk of contralateral symptom development. [American Academy of Orthopaedic Surgeons; Annals of the Rheumatic Diseases] 5

Use paracetamol (up to 4 g per day) as the first‑line oral analgesic for managing bilateral knee symptoms. [Annals of the Rheumatic Diseases] 5
Apply topical non‑steroidal anti‑inflammatory drugs (NSAIDs) for safe symptomatic relief without systemic adverse effects. [Annals of the Rheumatic Diseases] 5
Consider intra‑articular corticosteroid injections for acute knee effusions or flare‑ups to provide rapid pain control. [Annals of the Rheumatic Diseases] 5