The stress distribution and concentrated forcein the longitudinal and lateral directions produced by Nitinol Patellar Concentrator (NT-PC) in the Two-dunensional patella model were analyzedusing by using the method of photoelasticity.The results showed that the memory compression mainly comes frorri the longitudinal direction (30￣40Kg)and partially from the lateral direction (5￣7.5Kg).NT-PC was employed in 4, 000 cases.It turns out that the time needed for the affected knee to bendstretch like the opposite healthy knee is 2.5￣20 weeks,with a mean of 7.14 weeks. There were no complications of postoperative infection, refracture,necrosis,non-union or functional impediment in the injured knee jonts.It is noteworthy that NT-PC not only adaptable to various kinds of patellar fracture but also advantageous to avoiding"partial or total patellectomy".It is a simple and effective new-method for treatment of patellar fracture.