Fig. 1

Schematic layout of samples taken from the distal femur. 1 back of the lateral condyle; 2 middle of the lateral condyle; 3 front of the lateral condyle; 4 lateral part of the femoral trochlea; 5 middle of the femoral trochlea; 6 medial part of the femoral trochlea; 7 front of the medial condyle; 8 middle of the medial condyle; and 9 back of the medial condyle