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The lateral patellar facet
12%
308/2600
The medial patellar facet
83%
2169/2600
The odd patellar facet
1%
28/2600
The medial trochlea
2%
61/2600
The central trochlea
20/2600
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Lateral patellar dislocations are by far the most common. The medial facet of the patella will impact on the lateral trochlear ridge. Either of these would be acceptable answers, but lateral trochlea is not listed. Even without an osteochondral fracture, an MRI of an acute patellar dislocation will generally show bone bruises in these two locations. Nomura looked at 39 consecutive arthroscopies after lateral dislocation and 95% had patellar chondral defects. They also reported that the medial facet of the patella is the most commonly injured site of the patella.
4.3
(23)
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