(Fig 5-D.02) Components of Posterior Stabilized Total Knee Arthroplasty

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MSK MRI Jee Eun Lee

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📌 Components of Posterior Stabilized Total Knee Arthroplasty

✅ Total Knee Prosthesis

• The total knee prosthesis generally comprises a metallic bicondylar femoral component, a metallic tibial tray component, a polyethylene tibial insert, and a polyethylene patellar button. The type of implant design affects the shape of the associated polyethylene tibial insert.

 

• The shape of the polyethylene tibial insert varies greatly due to the myriad TKA designs. 
• One of the challenges during MRI interpretation is determining whether the appearance of the polyethylene tibial insert indicates an abnormality, such as polyethylene wear, or reflects the manufacturer’s design.

 

✅ Posterior-Stabilized (PS) Knee Prosthesis

• The posterior-stabilized (PS) knee prosthesis is of an unconstrained design tailored for patients in which preservation of the native posterior cruciate ligament is not possible. 
• This design features the post-cam mechanism to substitute for the function of the posterior cruciate ligament. 
• In these designs, the femoral component has a cam that engages the vertical post on the polyethylene tibial insert to promote rollback of the femur on the tibia and improve flexion.

 

✅  Posterior Cruciate-Retaining Designs

• Posterior cruciate-retaining designs rely on the native PCL for stability during flexion, and the polyethylene tibial insert does not feature a post.

 

References

• Skeletal Radiol. 2019 Jul;48(7):1145-1148
• AJR 2016; 206:1264–1271

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#KneeArthroplasty, #TKA, #TotalKneeProsthesis, #OrthopedicImplants, #PolyethyleneTibialInsert, #PosteriorStabilized, #PCLRetention, #MRIInterpretation, #OrthopedicSurgery, #MedicalImaging