尺桡骨形状记忆接骨器的研制与临床应用

Design and clinical application of radius-ulna shape memory connector

目的探索治疗尺、桡骨干骨折及骨不连的新技术。方法利用镍钛合金的记忆效应和尺、桡骨干的解剖特征,研制具有三维固定作用并能纵向记忆加压于骨断端的尺桡骨形状记忆接骨器(RSMC)。应用于临床治疗尺、桡骨干新鲜骨折31例57根、骨不连39例53根,共70例110根。结果所有患者术后获平均1年6个月(7个月～2年)随访。新鲜骨折组:无骨折延迟愈合或骨不连患者,骨牢固愈合时间平均为2.3个月。骨不连组:全部患者一次治愈,骨牢固愈合时间平均为3.5个月;2例皮肤切口轻度感染,未影响内固定与骨愈合。结论RSMC利用镍钛合金的记忆特性使骨断端在三维固定持续加压状态下愈合,是治疗尺、桡骨干新鲜骨折及骨不连的新器械。

Objective To develop a new method of treating fractures and nonunion of radial and ulnar diaphyses. Methods We designed a kind of radius-ulna shape memory connector （RSMC） on the basis of the shape memory property of nitinol alloy and the anatomic characteristics of radial and ulnar diaphyses. It is capable of providing 3-D fixation and exerting continually longitudinal compression upon fracture sites. It was used in 31 cases （57 bones） of fresh fractures and 39 cases （53 bones） of nonunion, totaling 70 cases （110 bones）. Results The mean follow-up time was 1.5 years（from 7 months to 2 years）. In the fresh fracture group, no delayed union or nonunion was observed, and the solid bone healing time averaged 2.3 months. In the nonunion group, all the cases were cured at one time and the solid bone healing time averaged 3.5 months, but two cases were complicated with slight skin infection which had little influence on the internal fixation and bone healing. Conclusion RSMC can provide a new and efficacious method for the treatment of fracture and nonunion of radial and ulnar diaphyses.