Hashimoto Kohei, Nakamura Yukio, Takahashi Nobunori, Morishima Takkan
Department of Orthopedic Surgery, Aichi Medical University, 1-1 Yazakokarimata, Nagakute 480-1195, Aichi, Japan.
Department of Orthopedic Surgery, Division of Osteoporosis, Locomotive Syndrome, Joint Disease Center, Aichi Medical University, 1-1 Yazakokarimata, Nagakute 480-1195, Aichi, Japan.
J Clin Med. 2025 Apr 15;14(8):2724. doi: 10.3390/jcm14082724.
: The increasing number of aging patients with total hip arthroplasties (THA) causes an increased incidence of periprosthetic fractures (PPF). The study aimed to evaluate the impacts of two different materials in the same-sized cemented stems on PPF in bone models. : This study compared the maximum rotational torque leading to PPF when stems made of cobalt-chromium-molybdenum (Co-Cr-Mo) alloy and stainless use steel (SUS) were implanted using simulated bone models (Sawbones, 3403). The maximum destruction torque was compared statistically for each material (Co-Cr-Mo alloy vs. SUS stainless steel) in this model, and fracture patterns were examined. : The PPF occurred with a spiral propagation from the proximal femur towards the diaphysis, with breakage occurring near the distal end of the stem. There were no significant differences in the destruction torque values between the Co-Cr-Mo alloy (103.0 ± 14.9 Nm) and SUS (98.7 ± 15.1 Nm) samples ( = 0.575). The fractures using the bone models exhibited similar patterns in all specimens, resembling clinical PPF fracture types clinically, specifically Vancouver classification B2. : The comparison of the maximum destruction torques of the Co-Cr-Mo alloy and SUS cemented stems in simulating PPF showed no significant differences. The results suggest that the materials of the cemented stems might not significantly affect the occurrence of PPF in THA.
全髋关节置换术（THA）老年患者数量的增加导致假体周围骨折（PPF）的发生率上升。本研究旨在评估相同尺寸的骨水泥柄中两种不同材料对骨模型中PPF的影响。
本研究使用模拟骨模型（Sawbones，3403）比较了植入由钴铬钼（Co-Cr-Mo）合金和不锈钢（SUS）制成的柄时导致PPF的最大旋转扭矩。在该模型中对每种材料（Co-Cr-Mo合金与SUS不锈钢）的最大破坏扭矩进行统计学比较，并检查骨折模式。
PPF从股骨近端向骨干呈螺旋状扩展，在柄的远端附近发生断裂。Co-Cr-Mo合金样本（103.0±14.9 Nm）和SUS样本（98.7±15.1 Nm）的破坏扭矩值无显著差异（P = 0.575）。使用骨模型的骨折在所有标本中表现出相似的模式，临床上类似于临床PPF骨折类型，特别是温哥华分类B2。
在模拟PPF时，Co-Cr-Mo合金和SUS骨水泥柄的最大破坏扭矩比较无显著差异。结果表明，骨水泥柄的材料可能不会显著影响THA中PPF的发生。
