✅ Knee MRI Mastery/Chap 5CD. Cartilage Repair and TKA

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

MSK MRI 2024. 7. 19. 23:53

https://youtu.be/SNZeuBuUP_Q

https://youtu.be/POoP1plqOoI

 

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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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