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首頁(yè)> 外文期刊>Journal of orthopaedic research >Metaphyseal fracture healing follows similar biomechanical rules as diaphyseal healing.
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Metaphyseal fracture healing follows similar biomechanical rules as diaphyseal healing.

機(jī)譯：干fracture端骨折的愈合遵循與干dia端愈合相似的生物力學(xué)規(guī)則。

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It is generally supposed that the pattern of fracture healing in trabecular metaphyseal bone differs from that of diaphyseal fractures. However, few experimental studies to date have been performed, even though clinically many fractures occur in metaphyseal bone. Particularly, the influence of biomechanical factors has not yet been investigated under standardized conditions. Our aim was to correlate the interfragmentary strain (IFS) with the bone-healing outcome in a controlled metaphyseal fracture model in sheep. Twelve sheep received a partial osteotomy in the distal femoral condyle close to the trochlea. The determination of the IFS by in vivo X-ray analyses and a finite element model revealed that the deflection of the osteotomy gap by the patello-femoral force during walking provoked increasing strains of up to 40%. Bone healing was evaluated after 8 weeks by the assessment of the bone mineral density and by histomorphometry in regions of interest that displayed differing magnitudes of IFS. In areas with strains below 5% significantly less bone formation occurred compared to areas with higher strains (6-20%). For strains larger than 20% fibrocartilage layers were observed. Low IFS (<5%) led to intramembranous bone formation, whereas higher strains additionally provoked endochondral ossification or fibrocartilage formation. It is therefore proposed that metaphyseal bone healing follows similar biomechanical principles as diaphyseal healing.
機(jī)譯：一般認(rèn)為，小梁干bone端骨的骨折愈合方式與干dia端骨折不同。然而，盡管臨床上在干phy端骨中發(fā)生了許多骨折，但迄今為止尚未進(jìn)行任何實(shí)驗(yàn)研究。特別是，尚未在標(biāo)準(zhǔn)化條件下研究生物力學(xué)因素的影響。我們的目標(biāo)是在綿羊的掌骨干meta端骨折模??型中，將片段間張力（IFS）與骨愈合結(jié)果相關(guān)聯(lián)。十二只綿羊在靠近滑車(chē)的股骨遠(yuǎn)端con中接受了部分截骨術(shù)。通過(guò)體內(nèi)X射線分析和有限元模型對(duì)IFS進(jìn)行測(cè)定，結(jié)果表明，行走過(guò)程中pat骨股骨力量對(duì)截骨間隙的偏斜引起了高達(dá)40％的應(yīng)變?cè)黾印?8周后，通過(guò)評(píng)估骨礦物質(zhì)密度并通過(guò)組織形態(tài)計(jì)量學(xué)對(duì)感興趣區(qū)域中表現(xiàn)出不同IFS幅度的骨愈合情況進(jìn)行評(píng)估。與應(yīng)變較高的地區(qū)（6-20％）相比，應(yīng)變低于5％的地區(qū)發(fā)生的骨形成明顯減少。對(duì)于大于20％的纖維軟骨層的菌株，觀察到。低IFS（<5％）會(huì)導(dǎo)致膜內(nèi)骨形成，而較高的應(yīng)變會(huì)引起軟骨內(nèi)骨化或纖維軟骨形成。因此，提出干meta端骨愈合遵循與干phy端愈合相似的生物力學(xué)原理。

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