Knee arthroplasty Flashcards
Which femoral condyle is larger and rounder
The medial femoral condyle
What does the radius of curvature of the LFC cause?
Causes posterior rollback on the tibia during flexion
What does the posterior rollback of LFC cause?
External rotation of the knee during flexion
When does most of the ER of the knee occur during flexion?
During the first 15 degrees of flexion
Why is the ER of the knee during flexion important?
Helps the trochlear groove move a bit more laterally to engage patella
What causes patella maltracking?
femur not rotaing, insufficient medial structures (specifically medial patellofemoral ligament), hypoplastic trochlear groove
Why are medial structures (e.g. medial patellofemoral ligament) important for patella tracking?
They act like a harness to guide the patella
Why does a hypoplastic trochlear groove cause patella maltracking?
Fails to provide a bumper to guide the patella
Apart from patella maltracking, why is posterior rollback important?
Determines the point of terminal flexion
Why is the point of terminal flexion important when talking about posterior rollback?
Its essential for achieving deep full flexion. Knee would impinge around 90 degrees if no rollback
