Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine
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To inform physicians treating sport injuries of a rare and unique form of patella dislocation, the horizontal intra-articular dislocation of the patella. ⋯ Most physicians are unaware of this rare type of patella dislocation. It can, however, be recognized by its typical mechanism of injury and clinical features. Unlike the common lateral patella dislocation, on-site reduction is not possible. This injury requires closed and often open reduction under general anesthesia.