Development of small diameter intramedullary nails made from ISO 5832-9 stainless steel.

The Australian and New Zealand journal of surgery Pub Date : 2000-03-01 DOI:10.1046/j.1440-1622.2000.01790.x

A M Ingman

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引用次数: 4

Abstract

Background: In order to improve strength in small diameter intramedullary nails, a system was designed in which the implants were manufactured from 30% coldworked ISO 5832-9 stainless steel.

Methods: Nail diameters were 9 and 10 mm for the femur, and 8 and 9 mm for the tibia. The nails were solid rods and the screws were partially threaded. Pre-clinical bending yield tests established that the 8-, 9- and 10-mm diameter rods had strengths comparable, respectively, with 10-, 12- and 14-mm diameter Grosse-Kempf nails. Forty-eight femoral and 98 tibial shaft acute fractures were treated with this system. Postoperatively, patients were allowed to gently bear weight as tolerated.

Results: There was one broken nail, occurring 10 months after femoral nailing. There were six broken screws, occurring between 3 and 6 months postoperatively in two patients and after more than 6 months in four patients. The broken screws had no adverse clinical effect. Five patients required late bone grafting or exchange nailing, and 15 patients required dynamization.

Conclusion: This design of small diameter locked intramedullary nails was strong enough to allow early weightbearing.

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由ISO 5832-9不锈钢制成的小直径髓内钉的研制。

背景:为了提高小直径髓内钉的强度，设计了一种系统，其中种植体由30%冷加工的ISO 5832-9不锈钢制造。方法:股骨钉直径分别为9、10 mm，胫骨钉直径分别为8、9 mm。钉子是实心棒，螺丝是部分螺纹的。临床前弯曲屈服测试表明，8,9,10 -mm直径棒的强度分别与10-mm, 12- mm和14-mm直径Grosse-Kempf钉子相当。应用该系统治疗股骨骨折48例，胫骨骨折98例。术后，允许患者在耐受的情况下轻负重。结果:骨折1例，发生于股骨内钉10个月后。6例螺钉断裂，2例发生在术后3 ~ 6个月，4例发生在术后6个月以上。骨折螺钉无不良临床反应。5例患者需要后期植骨或交换钉，15例患者需要动力化。结论:这种设计的小直径锁定髓内钉足够坚固，可以早期负重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The Australian and New Zealand journal of surgery

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