A Biomechanical Comparison Of Anterior Cruciate Ligament Tibial Avulsion Fracture Under Various Techniques Of Fixation

Objective To observe biomechanical studies that have compared the strength of various techniques of anterior cruciate ligament tibial avulsion fracture fixation. Methods Classification and treatment of tibial eminence fractures are determined by the degree of fragment displacement. A variety of surgical procedures have been proposed to stabilize displaced fractures. Using 15 cadaveric human knees,3 different fixation techniques of avulsion fractures are compared by suture fixation group,suture and cannulated screw fixation group, cannulated screw fixation group.The knee joint specimens were fixed at flexion of 30℃nd subject to continuous stretch stresses of 60N,90N,120N,5ON respectively on a Material Test System-585,which conducted a simulated Lachman test.The specimens were scanned by 3D Digital Corp.Data are recorded and processed by geomagic studio 5.0 software to establish three techniques of fixation.The test results are analyzed by SPSS 13.0 software. Results There are significant differences between each fixation group in the length change of ACL (P< 0.05), suture and cannulated screw fixation group (3.53±0.24mm) is significantly strongest than other group, suture fixation group is the smallest (5.75±0.53mm),cannulated screw fixation group is (4.63±0.37mm). Conclusion The initial ultimate strength of suture and cannulated screw fixation of tibial eminence fractures in these specimens was significantly strongest. There are statistically differences between each anterior tibial load state, after the cyclic loading state have the least effective stability.