Illustration for lateral patellar dislocation
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Figure 1: normal orientation of patellofemoral components in extension.
Figure 2: impaction of medial aspect of patella against lateral femoral condyle following injury.
Figure 3: recoiling of patella.
Sites for retinacular injury are as follows:
- at patellar insertion,
- at midsubstance, or
- within vastus medlalis obliquus muscle.
- 1.Kirsch MD, Fitzgerald SW, Friedman H et-al. Transient lateral patellar dislocation: diagnosis with MR imaging. AJR Am J Roentgenol. 1993;161 (1): 109-13. doi:10.2214/ajr.161.1.8517287 - Pubmed citation