The effect of knee flexion and rotation on the tibial tuberosity-trochlear groove distance.

Purpose: The purpose was to measure the effect of flexion and additional rotation of the femur relative to the tibia on the tuberosity-trochlear groove distance (TT-TG) in the same subject in 20 cadaveric knees joint.

Methods: In 20 human adult cadavers, formal fixed knees (age: 81.9 years, SD 12.