[An experimental study on mechanism of cruciate ligament rupture especially on the effect of mechanical property and tensile speed].
Patterns of rupture of the anterior cruciate ligament of the knee are most probably determined by mechanical factors. An experimental study was designed to determine patterns of rupture of the anterior cruciate ligament in immature (young) and fully mature (adult) pig models. Two different methods were used to test disruption forces in young and adult pig knee specimens: quasi-static tension at three different rates using the Instron testing instrument (1000), and impact loading using a specially designed machine. A total of 118 pig test knees was studied. Greater rupture force was required in the adult pigs than in the young pigs. In addition, rupture force was higher with impact loading test than with quasi-static tensile test. In the young pigs, avulsion fracture occurred most commonly in both tests. In the adult pigs, however, mid-substance disruption occurred with quasi-static tensile test and bony avulsion occurred with impact loading test. Patterns of disruption in pig models varies with the relative maturity of the animals tested and mode of force application. A possible explanation for this is the relative strength of the bone and ligament in animals of varied maturity.
Minezaki
T
T
Department of Orthopaedic Surgery, School of Medicine, Tokai University, Kanagawa, Japan.
Tomatsu
T
T
Rokuuma
N
N
D000367:Age Factors; D000818:Animals; D001696:Biomechanical Phenomena; D007717:Knee; D008022:Ligaments / Q000293:injuries* / Q000473:pathology / Q000502:physiology; D012421:Rupture; D013314:Stress, Mechanical; D013552:Swine; D013718:Tensile Strength / Q000502:physiology*