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首页> 外文期刊>Journal of International Medical Research >Comparison of two different on-shelf femoral stems for Crowe type IV developmental dysplasia of the hip
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Comparison of two different on-shelf femoral stems for Crowe type IV developmental dysplasia of the hip

机译：两种不同现成股骨头对髋关节型IV型发育不良的比较

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Objective This study was performed to evaluate the proximal anatomical compatibility of stems for treatment of Crowe IV developmental dysplasia of the hip (DDH) using a previously developed three-dimensional comparison technique. Methods Patients with Crowe IV DDH who underwent computed tomography were retrospectively analyzed. The femoral medullary canals were three-dimensionally reconstructed, and models of cementless modular (S-ROM; DePuy Synthes) and conical (Wagner Cone; Zimmer Biomet) implants were used for virtual implantation. The negative point percentages (NPPs) were applied to verify fitting. The average distance (deviation) and the root mean square of the distance (RMSd) were used to quantify geometric compatibilities. Results Four (16.7%) and 12 (50.0%) femoral medullary canals could not be fitted properly with either the modular or conical implant. The NPPs in the distal comparison region were significantly greater in the conical than modular group. The deviation was significantly smaller in the modular than conical group. The RMSd was also significantly smaller in the modular than conical group. Conclusions Compared with conical implants, modular implants might be more effectively used in patients with Crowe type IV DDH. However, some Crowe IV DDH femurs with severe deformity cannot be fitted with either of these two on-shelf implants.
机译：目的是使用先前显影的三维比较技术来进行本研究以评估茎治疗髋关节（DDH）的蜂窝IV发育发育不良的近端解剖相容性。方法回顾性分析了接受过计算断层扫描的克鲁IV DDH的患者。股骨髓系是三维重建的，并且无硬模块化（S-ROM; Depuy Synthes）和锥形（瓦格纳锥; Zimmer Biomet）植入物用于虚拟植入。应用负点百分比（NPP）验证配件。使用距离（RMSD）的平均距离（偏差）和根均线来量化几何兼容性。结果4（16.7％）和12（50.0％）股骨髓系，不能与模块化或锥形植入物适当安装。在锥形上的远端比较区域中的NPP比模块化组在显着大。模块化比锥形组在模块中显着较小。在模块化比锥形组中，RMSD也明显较小。结论与锥形植入物相比，群体IV DDH患者可能更有效地使用模块化植入物。然而，一些具有严重畸形的克鲁IV DDH股骨不能装配这两款植入物中的任何一种。

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