(Fig 5-D.22) Varus and Valgus Instability After TKA

https://youtu.be/3AYpQXoHOAk

 

https://youtu.be/POoP1plqOoI

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📌Cases of the factors contributing to varus and valgus instability after TKA

1️⃣ Peri-prosthetic Fractures

• Medial femoral epicondyle/condyle fractures
• Risk of asymmetric extension instability

 

2️⃣ Osteolysis

• Can lead to pathologic fractures
• Increases risk of asymmetric extension instability

 

3️⃣ Aseptic Loosening

• Tibial tray subsidence
• Results in varus deformity

 

4️⃣ Polyethylene Wear

• Caused by excessively tight medial extension gap
• Leads to varus deformity recurrence and TKA failure
• An excessively tight extension gap on the medial side can lead to medial polyethylene wear from overload and subsequent varus deformity recurrence with TKA failure.

 

5️⃣ Ligamentous Failure

• e.g., Lateral collateral ligament tear
• Causes post-TKA instability

 

6️⃣ Other Factors

• Osteonecrotic bone collapse: femoral component subsidence
• Tibial component loosening and valgus subsidence

 

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#TKAInstability, #VarusValgusKnee, #PeriProstheticFracture, #KneeOsteolysis, #AsepticLoosening, #PolyethyleneWear, #LigamentousFailure, #RevisionTKA, #KneeDeformity, #PostTKAComplications