Figure 2.

 Regional variation of deformation throughout the patella for different types of activities; average over all 12 volunteers. View on the retropatellar surface from posteriorly (lateral facet on the right and medial facet on the left). Dark areas are regions of high deformation and lighter areas are regions of low deformation. The results show that activities with a limited range of knee motion (squatting and walking) lead to deformation of some confined areas, whereas activities that involve a larger range of motion lead to more widespread deformation of patellar cartilage.