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The kneecap or patella is part of a chain of structures that help to straighten the knee.
Video demonstrating the J-sign
Discussing how the anatomy can affect the tendency to dislocate the patella.
Part 8 of a course on Patellofemoral Pain by Dr Ronald Grelsamer of Mount Sinai Hospital in New York.
How to Deal With Chronic Patellar Instability: What Does the Literature Tell Us? Sanchis-Alfonso V. Sports Health. 2016 Jan; 8(1): 86–90.