(Fig 5-D.08) Dislocation of Polyethylene Insert

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MSK MRI Jee Eun Lee

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📌 Dissociation of the Polyethylene Tibial Insert in Total Knee Arthroplasty

• Dissociation of the polyethylene tibial insert from the tibial baseplate is a rare complication after Total Knee Arthroplasty (TKA).
• Dissociation of the polyethylene tibial insert can occur due to dislodgement of the locking screw or pin.

 

✅ MRI Findings

• Linear signal hyperintensity between the polyethylene tibial insert and tibial tray suggests the presence of dissociation.
• An obvious gap between the polyethylene tibial insert and tibial tray, along with thinning of the polyethylene tibial insert, indicates:

✅ Clinical Implications

• The dislocated polyethylene insert can cause significant damage to the patellar tendon.
• Dissociation should be considered in the differential diagnosis for patients with:

 

References

1. AJR 2016; 206:1264–1271
2. J Arthroplasty. 2011 Feb;26(2):339.e1-4

 

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