Fig. 2

a: Setup for biomechanical cyclic loading tests of a human cadaveric knee. The femur is kept fixed while a load is applied on the quadriceps tendon via two tension belts and a quadriceps clamp to move the knee from 90° flexion (as shown here) to almost full extension against gravity. An electromagnetic tracking system captures the kinematics of microsensors inserted in the upper and lower patella fragment and the tibia. b: Setup for biomechanical load to failure tests with a human cadaveric knee. The specimen is fixated rigidly with its embedded femur and tied in a 45° position with a nylon rope through the tibia. The load is translated to the quadriceps tendon by the clamp and tension belts