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Clinical video showing "reverse" J sign with chronic patellofemoral instability. The true "J" is often more subtle and is caused due to the imbalance between the medial and lateral patellar forces are manifested by an abrupt medial deviation of the patella as the patella engages the trochlea early in flexion, known as the “J” sign. Alternatively, the “J” sign may be observed as the knee knee extends from a flexed position. Lateral deviation of the patella can be observed during the terminal phase of extension Post WR. Clinical evaluation of patients with patellofemoral disorders. Arthroscopy. 1999 Nov-Dec;15(8):841-51. Level of Evidence: Undefined. PMID: 10564862 (Link to Abstract)
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