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. 2012 Jun 6;7:21. doi: 10.1186/1749-799X-7-21

Figure 1.

Figure 1

The plain Merchant axial radiograph demonstrates an osteochondral fracture of the medial facet of the patella in a first-time traumatic patellar dislocation, a secondary sign of an injury to the medial patellofemoral ligament, at the patellar attachment.