Periprosthetic Fractures of the Femur After Hip Arthroplasty: An Analysis of 99 Patients

The medical records and radiographs of 99 patients treated for a periprosthetic femur fracture after total hip arthroplasty over a 17-year period at a single institution were prospectively reviewed. Fractures were classified according to the Vancouver system and stratified as to treatment method. Sixty-six patients had complete records available and a minimum of 12 months follow-up. Overall, 86% of the patients achieved fracture union. The success rate of cemented revision in the B2 and B3 groups was 84%, whereas cement-less revision was 86% successful. The complication rate of surgical treatment was 29%. Fracture union with a stable implant was possible in the majority of cases. Our results support the use of the Vancouver classification as a treatment algorithm.     

关于温哥华C型股骨假体周围骨折采用不同长度锁定钢板固定的生物力学研究

目的通过比较四种不同长度的锁定钢板在治疗温哥华C型股骨假体周围骨折的生物力学实验中的表现，来分析锁定钢板相对于股骨假体柄远端的位置与产生的刚度和应力集中情况的关系。 方法选取10对成人新鲜股骨标本，随机均分为四组，制作温哥华C型股骨假体周围骨折模型，以四种不同长度的锁定钢板固定：A组，钢板最近端双皮质锁定螺钉距离假体尖端1个股骨直径；B组，钢板最近端双皮质锁定螺钉与假体尖端平齐；C组，钢板最近端单皮质锁钉与假体尖端重叠1个股骨直径；D组，钢板最近端单皮质锁钉与假体尖端重叠2个股骨直径。分别进行轴向压载实验、扭转实验、内外四点侧弯实验及前后四点侧弯实验，记录各组数据并进行统计学分析；最后进行循环负载实验，记录骨折情况。 结果各组在各实验中表现出的刚度值有显著差异，D组刚度值最大（P<0.05）；在循环负载实验中，D组骨折线分布于股骨假体尖端、近端锁钉以及钢板远端附近，A、C组的骨折线集中在近端锁钉与股骨假体尖端之间，B组骨折线集中在股骨假体尖端与钢板顶端的线性区域内，结果显示D组应力集中程度比A、B、C三组低（P<0.05）。 结论在使用锁定钢板治疗温哥华C型股骨假体周围骨折时，随着钢板长度增加，内固定稳定性提高；锁定钢板与股骨假体柄尖端重叠固定不会增加应力集中，反而随着钢板与股骨假体重叠区域增加，应力显著分散。