Instability after TKA
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.
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4Practised by MCQ
10What percentage of total knee arthroplasties (TKA) are revised due to instability?
mcqWhich of the following is a common cause of coronal plane instability after TKA?
mcqWhat clinical test is used to evaluate coronal plane instability in TKA?
mcqWhich type of instability is characterized by a flexion gap larger than the extension gap?
mcqWhat is the primary management strategy for coronal instability due to ligament imbalance?
mcqIn flexion instability, which anatomical feature is often the cause of the problem?
mcqWhat imaging modality is useful in diagnosing component position in cases of TKA instability?
mcqWhat is a common clinical feature of extension instability after TKA?
mcqWhich of the following causes mid-flexion instability?
mcqWhat is the recommended management for flexion instability related to excessive posterior tibial slope?