Maine Orthopaedic Review Monthly Challenge

Test Your Knowledge of Treating Patients After Total Knee Arthroplasty

Bruce F. Gomberg, MD


November 03, 2017

Increasing the Q angle leads to patellar instability. Internal rotation of the tibial component is the most frequent cause of patellar subluxation. In this case, the tibial tubercle is relatively externally rotated, causing an increase of the Q angle. Femoral component lateralization, patellar medialization, proximal tibial varus, and femoral component external rotation all serve to decrease the Q angle.[3,4]


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