Objective To improve the treatment of fracture of patella

especially in the treatment of comnminut- ed fracture. Methods : Using four cadaver wet knee specimens witn certain length of femur and tibia preserved

except the quadriceps muscle

the capsule

the patella tendon

the other soft tissues were removed. The quadriceps muscle fixated under the knee was completely extended. The model of patella transverse fracture was made. Using 4 × 4 Latin Square design

four fixation methods were used: A. circular wire and Maxon tension band wire suture; B. modified tension band wire; C. tension band wire and D. only circular wire. Measurement of biomechanics of every model was wade with XU Shao - ting’ s method. Results : The efficiency of four fixations had significant difference (P<0. 05). The A is similar to B. Both are better than the other two. D is the worst. The extension force of quadriceps tendon of the circular wire and Maxon tension band wire suture and the modified tension band wire reached two times of body weight. Conclusion : For some comminuted fracture

the modified tension band wire is not suitable

then

the circular wire and Maxon tension band wire suture are the best. The method is reliable and responsible to early function exercise.