Accounts for ~20% of TKA revisions. Types: extension instability, flexion instability, mid-flexion instability, recurvatum. Causes: ligament imbalance, component malposition, polyethylene wear, PCL incompetence. Diagnosis: clinical exam, stress radiographs, CT for component position. Management: revision TKA with constrained implants as per instability type.
What percentage of total knee arthroplasties (TKA) are revised due to instability?
Which of the following is a common cause of coronal plane instability after TKA?
What clinical test is used to evaluate coronal plane instability in TKA?
Which type of instability is characterized by a flexion gap larger than the extension gap?
What is the primary management strategy for coronal instability due to ligament imbalance?
In flexion instability, which anatomical feature is often the cause of the problem?
What imaging modality is useful in diagnosing component position in cases of TKA instability?
What is a common clinical feature of extension instability after TKA?
Which of the following causes mid-flexion instability?
What is the recommended management for flexion instability related to excessive posterior tibial slope?
