Mechanism
Twisting injury to extended knee
Patella is displaced laterally over the lateral condyle
Clinical Features
Lateral displacement of the patella
Apprehension Sign
Associated Injury
Osteochondral Fracture
medial patellofemoral retinacular tissue injury
X-RAY Feature
Knee Series: AP, Lateral, Skyline View
Reduction
Flex patient’s hip
Hyperextend the knee
Apply posterio-medial pressure along lateral border of the patella
ED Management
Knee Immobilizer
Follow up with ortho in 1 week