Knee Arthokinematics Flashcards
In open chain what is moving in the tibiofemoral joint?
Concave tibia moving on convex femur
Roll and glide occur together
In closed chain what is moving in the tibiofemoral joint?
Convex femur moving on concave tibia
Roll and glide are opposite
What is the arthrokinematics of the tibiofemoral joint during flexion/extension during open chain exercises
Extension: Anterior roll, Anterior Glide
Flexion: Posterior roll, Posterior glide
What is the arthrokinematics of the tibiofemoral joint during flexion/extension during closed chain exercises
Extension: Anterior roll, Posterior glide
Flexion: Posterior roll, Anterior glide
What is the arthrokinematics of the tibiofemoral joint during lateral and medial rotation during open chain?
Spin movement
Tibia on femur
What is the arthrokinematics of the tibiofemoral joint during lateral and medial rotation during closed chain?
Spin movement
Femur on tibia
Where does the screw-home mechanism occur?
Occurs in the final 20-30 degrees of knee extension
Which condyle stops first during the screw-home mechanism?
Lateral condyle
Name the closed and open packed positions for the tibiofemoral joint, along with the capsular pattern
Closed: Full extension w/ER
Open: 25-30 degrees of knee flexion
Capsular Patter: Flexion > Extension
What is the function of the patellofemoral joint?
Increases the angle of insertion for the quadriceps.
Increases torque producing capability of the quadriceps
What is the open chain and closed chain motions for the patellofemoral joint?
Open Chain: Patella on Femur
Closed Chain: Femur on Patella
Which direction does the patella move during flexion/extension?
Flexion: More distal along the femoral condyles
Extension: Moves proximal on the condyles
What is patella alta?
high-riding patella
What’s patella baja?
low-riding patella
What type of joint is the proximal tibiofibular joint?
Plane synovial joint
