Experimental study on initial stability of total hip arthroplasty and local osteolysis

本研究的目的是阐明直接插入技术的优点，而无需任何准备的股骨髓腔的股骨部件的初始稳定性和骨质溶解。在第一和第二个研究中，喷砂锥形钛合金棒植入30 SAW BONE泡沫皮质胫骨和24猪股骨。LR 1组（线对线扩髓技术）包括10个骨模型，扩髓后将棒插入髓腔。UR1组（扩髓技术）包括10个骨模型，在0.5 mm扩髓后插入棒。DI1组（直接插入技术）包括10个骨模型，使用棒插入而不扩髓。LR 2组（线对线扩髓技术）包括8个猪股骨，扩髓后插入棒。UR2组（扩髓技术）包括8个猪股骨，在0.5mm扩髓后插入棒。DI2组（直接插入技术）：8只猪股骨， ...更多信息 d用棒不铰孔。使用试验机对样品进行拔出试验。在第三项研究中，从3种尺寸中选择一种，并将每种喷砂钛合金股骨柄插入10只比格犬的20个股骨中。将20例股骨分为4组。R0组（Rasping插入技术）包括5个股骨，在处死后即刻扩髓后插入股骨柄。R2组（Rasping插入技术）包括5个股骨，在扩髓后插入股骨柄，并在术后2周收获。D0组（直接插入技术）包括5个股骨，在处死后立即插入股骨柄，不扩髓。D2组（直接插入技术）包括5个股骨，插入股骨柄，不扩髓，术后2周收获。在40 kgf载荷后测量股骨柄的微动和位移。在第一次和第二次研究中，LR 1组（21.2±5.5kgf）与UR 1组（47±6.9kgf）之间以及LR 1组与DI 1组（39.9±19kgf）之间存在显著差异。LR2组（34±16.5kgf）与DI2组（56.3±1.6kgf）之间也存在显著差异。在第三项微动研究中，R2组（48.6±23.9μm）和D2组（20.0±4.8μm）之间存在显著差异。在第三项位移研究中，R0组（7.2±3.0μm）和D0组（2.6±1.0μm）之间存在显著差异。第三项研究的结果表明，直接插入技术在术后即刻产生了良好的稳定性，术后2周股骨柄周围的软组织较少。第一项和第二项研究的结果表明，需要进行细致的研究，以澄清直接插入技术和扩孔技术之间的差异。少

The purpose of this study was to clarify the advantages of direct insertion technique without any preparation of the femoral canal for the initial stability of femoral components and osteolysis.In the first and second studies, sand-blasted tapered titan alloy rods were implanted in 30 SAW BONE Foam Cortex TIBIA and 24 pig femora. Group LR1 (Line-to-line reaming technique) included 10 bone models which were inserted with the rod into the canal after reaming. Group UR1 (Underreaming technique) included 10 bone models which were inserted with the rod after 0.5 mm underreaming. Group DI1 (Direct insertion technique) included 10 bone models which were inserted with the rod without reaming. Group LR2 (Line-to-line reaming technique) included 8 pig femora which were inserted with the rod after reaming. Group UR2 (Underreaming technique) included 8 pig femora which were inserted with the rod after 0.5mm underreaming. Group DI2(Direct insertion technique)included 8 pig femora which were inserte … More d with the rod without reaming. A pullout test was performed on samples using a testing machine. In the third study, each sand-blasted titan alloy femoral stem was selected from one of 3 sizes and inserted in 20 femora of 10 beagles. Twenty femora were divided into 4 groups. Group R0 (Rasping insertion technique) included 5 femora which were inserted with the stem after reaming just after sacrifice. Group R2 (Rasping insertion technique) included 5 femora which were inserted with the stem after reaming and harvested 2 weeks after surgery. Group D0 (Direct insertion technique) included 5 femora which were inserted with the stem without reaming just after sacrifice. Group D2 (Direct insertion technique) included 5 femora which were inserted with the stem without reaming and harvested 2 weeks after surgery. The micro motion and displacement of the stem were measured after 40 kgf loading. Next, polyethylene particles (200mg) were injected into 4 hip joints of 4 other beagles after surgery with rasping insertion technique or direct insertion technique.In the first and second studies, there were significant differences between Group LR1 (21.2±5.5kgf) and Group UR1 (47±6.9kgf), and between Group LR1 and Group DI1 (39.9±19kgf). There was also a significant difference between Group LR2 (34±16.5kgf) and Group DI2 (56.3±1.6kgf). In the third study on micro motion, there was a significant difference between Group R2 (48.6±23.9μm) and Group D2 (20.0±4.8μm). In the third study on displacement, there was a significant difference between Group R0 (7.2±3.0μm) and Group D0 (2.6±1.0μm). The polyethylene particles did not generate osteolysis in all femora.The results of the third study suggested that the direct insertion technique generated good stability just after surgery and less soft tissue surrounding the stem 2 weeks after surgery. The results of the first and second studies suggested that meticulous study was needed to clarify the difference between direct insertion technique and underreaming technique. Less