Department of Orthopedics, The First People's Hospital of Fuyang Hangzhou, Hangzhou 311400, China.
Comput Math Methods Med. 2022 Feb 3;2022:2008668. doi: 10.1155/2022/2008668. eCollection 2022.
Memory alloy patella claws for treating patella fractures have been used for more than 30 years with many desirable features including fast healing, quick recovery, and avoidance of top abrasion of Kirschner wires and other complications. However, there are many models and it is difficult to choose the accurate claw for the patient. In this study, a finite element model of the butterfly-shaped patellar claw made of shape memory alloy was established, its mechanical structure was analyzed, and its clinical application was monitored. We used Solidworks Simulation software for modeling and mainly analyzed the force of the compression ring of the butterfly-shaped patellar claw. Clinically, we chose a closed fresh patella fracture case. After finite element analysis, the maximum stress that the compression ring of the butterfly-shaped patellar claw can withstand is 568.1 MPa. In this range, it always has elastic deformation resistance. The butterfly-shaped patella claw is fixed on the patella and will not break when subjected to a maximum force of 150 N on the encircling arm, and at the same time, there will be no pressure failure due to plastic deformation. A total of 27 cases were clinically used for the assessment of the clinical efficacy of the newly designed butterfly-shaped patella claws. The average follow-up time was 15.5 months, and the average fracture healing time was 8-12 weeks. All patients can get out of bed with crutches within 2 to 3 days after surgery. Among them, there were 15 cases with excellent functional ratings, 10 cases with good ratings, 2 cases with acceptable ratings, and no cases with poor ratings. The designed butterfly-shaped patella claws can provide an effective method for the treatment of patella fractures.
记忆合金髌骨爪治疗髌骨骨折已有 30 多年的历史，具有许多理想的特点，包括快速愈合、快速恢复，避免克氏针的顶部磨损和其他并发症。然而，有许多型号，很难为患者选择准确的爪。在本研究中，建立了一种蝶形记忆合金髌骨爪的有限元模型，分析了其力学结构，并监测了其临床应用。我们使用 Solidworks Simulation 软件进行建模，主要分析了蝶形髌骨爪的压环的受力情况。临床上，我们选择了一个闭合的新鲜髌骨骨折病例。经过有限元分析，蝶形髌骨爪的压环所能承受的最大应力为 568.1 MPa。在这个范围内，它始终具有弹性变形阻力。蝶形髌骨爪固定在髌骨上，当环抱臂上受到 150 N 的最大力时，它不会断裂，同时也不会因塑性变形而产生压力失效。共有 27 例患者用于评估新设计的蝶形髌骨爪的临床疗效。平均随访时间为 15.5 个月，平均骨折愈合时间为 8-12 周。所有患者术后 2-3 天即可拄拐下床。其中，优功能评定 15 例，良 10 例，可接受 2 例，差 0 例。设计的蝶形髌骨爪可为髌骨骨折的治疗提供一种有效的方法。
