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Posterior Ankle Impingement MRI Findings

MRI Findings in Posterior Ankle Impingement

 

Intro: In this post we are going to look at the MRI findings that can be seen with Posterior Impingement. If you havent read the post on the bony changes in the posterior ankle that can predispose to impingement please read that first here at this link

Its also important to recognise that that we can only report on the findings that suggest impingement and not say that the patient HAS impingement. This is something for the clinician to determine with the clinical and radiological findings.

 

Need to Know: Pathology

Look for the causes/ sequelae of impingement listed below. In addition look for thickening/ ill definition or scarring of the PTFL and the Intermalleolar ligament.

ankle impingement mri findings radiology education asia

 

MRI Findings in Impingement

ankle posterior impingement mri findings radiology education asia

Image Above:Findings suggest posterior impingement. Posterior synovitis ( blue arrows), Soft tissue oedema ( pink arrow), Os trigonum with oedema ( yellow arrows) and ill definition and hyperintensity of the PTFL ( green arrow).

anke posterior impingement ptfl os trigonum radiology education asiaImage Above: Thick hyperintense PTFL ( Blue arrows) and unstable os trigonum with fluid in syndesmosis ( yellow arrow) and bone oedema ( pink arrows).

anke posterior impingement capsule and synovitis radiology education asiaImage Above: Normal posterior capsule ( yellow arrow) and normal posterior joint fluid ( blue arrow). Compare with capsular thickening ( pink arrows) and synovitis ( red arrow) where the joint fluid signal is reduced.

ankle posterior impingement loose body steidas process capsulitisImage Above: Findings of a loose body ( red arrow), Steida’s Process ( yellow arrow), capsular thickening and synovitis ( orange arrows)  and peri capsular oedema ( blue arrows) suggest posterior impingement.


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