| Objective To compare the mechanical stability of six internal fixation methods in the treatment of avulsion fracture of collateral ligament of the phalange.Methods Six pairs of fresh hand specimens were made into the avulsion fracture model of collateral ligament. A pair of hands were divided into experimental group and control group. The experimental group was fixed with new hook plate. In the control group, the thumb was fixed with self-made hook plate, the index finger was fixed with micro screw, the middle finger was fixed with Kirschner wire, and the ring finger was fixed with ordinary plate, the little finger was fixed with transverse micro hook steel plate. The lateral collateral ligament was loaded to test, and the maximum tension of 2 mm was recorded and the mechanical difference was analyzed.Results The maximum tension of 2 mm was (62.67±5.52) N, (58.22±5.23) N, (55.63±4.17) N, (48.57±4.50) N, (48.58±1.56) N in the experimental group, and (51.13±4.03) N, (22.88±3.52) N, (24.87±3.48) N, (47.17±2.77) N, (31.90±2.83) N in the control group respectively. There was no significant difference between the experimental group and the control group in the mechanical test to the ring finger, but the difference between the experimental group and the control group to the other fingers was statistically significant (P<0.05).Conclusion The new hook plate and ordinary plastic plate have strong biomechanical stability in the fixation of avulsion fracture of finger collateral ligament. |
