The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.
You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).
(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.
Fig. 4B —Artwork illustrates proposed mechanism of injury to patellar
and femoral articular surfaces during two stages of transient dislocation of
patella. Reduction stage. During second stage of transient dislocation of
patella, as patella bounces back into normal position, impaction of medial
patellar facet against nonarticular surface of lateral femoral condyle results
in bone contusions of lateral femoral condyle and medial aspect of patella
(long arrows). Osteochondral impaction injury can occur to medial
patellar facet (short arrow), but concave configuration of trochlear
groove protects femoral articular surface from impaction injury during
reduction stage.
