The J-sign, known as the lateral patellar tracking on anterior

J-sign is a physical examination observation that correlates with poor

Patellofemoral Pain Syndrome - OrthoInfo - AAOS

Clinical feature of patient suffered pain insensitivity syndrome

Patient-Reported Features of Lumacaftor-Ivacaftor associated

Patellar Instability Diagnosis & Treatment

Patellofemoral arthroplasty: expert opinion, Journal of Experimental Orthopaedics

Affected left knee;a)initial A-p and lateral view of left knee

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Affected left knee;a)initial A-p and lateral view of left knee