Load Patella

The patella was fixed in the previous step. This step removes the kinematic constraint on the patella, and loads the quadriceps tendon with a nominal load.

The total time for this step is 0.25 seconds.

Interactions

The interactions from the previous step are still active. All of the desired interactions should still be active in this step.

Kinematic Boundary Conditions

Femur

The femur is fixed in all degrees of freedom throughout this step.

Tibia

The tibia is fixed in all degrees of freedom throughout this step.

Patella

The proximal nodes in the quadriceps tendon are no longer fixed, they have no boundary conditions (note that their motion is still constrained with the patellar quadriceps connector).

No kinematic boundary conditions are specified for the patella.

Kinetic Boundary Conditions

Femur

No external loads are applied to the femur in this step.

Tibia

No external loads are applied to the tibia in this step.

Patella

A 20 N load is applied to the patellar quadriceps connector. This load is linearly increased from 5 N to 20 N throughout this step.