Assessment of primary stability of glenoid bone block procedures used for patients with recurrent anterior shoulder instability - a biomechanical study in a synthetic bone model.
Martin Heilemann, Yasmin Youssef, Peter Melcher, Jean-Pierre Fischer, Stefan Schleifenbaum, Pierre Hepp, Jan Theopold
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引用次数: 0
Abstract
Anterior glenoid reconstruction using bone blocks is increasingly recognised as treatment option after critical bone loss. In this study, a biomechanical test setup is used to assess micromotion after bone block augmentation at the glenoid, comparing bone block augmentation with a spina-scapula block to the standard coracoid bone block (Latarjet). Twenty-four synthetic shoulder specimens were tested. Two surgical techniques (coracoid and spina-scapula bone block augmentation) were used on two different types of synthetic bone (Synbone and Sawbone). The specimens were cyclically loaded according to the 'rocking horse' setup defined in ASTM F2028. A mediolateral force of 170 N was applied on the bone block and a complete test comprised 5000 cycles. The Micromotion between bone block and glenoid was measured using a 3D Digital Image Correlation system. The measured micromotion divided into irreversible and reversible displacement of the augmented block. Medial irreversible displacement was the dominant component of the micromotion. The spina-scapula bone block showed a significantly higher irreversible displacement in medial direction compared to the coracoid block, when aggregating both types of synthetic bone (spina: 1.00 ± 0.39 mm, coracoid: 0.56 ± 0.39 mm, p = 0.01). The dominant irreversible medial displacement can be interpreted as initial settling behaviour.
使用骨块重建前盂正日益被认为是严重骨质流失后的治疗选择。在本研究中,生物力学测试装置用于评估关节盂骨块增强后的微运动,并将脊柱-肩胛骨骨块增强与标准喙骨骨块(Latarjet)进行比较。共测试了24个人造肩部标本。两种手术技术(喙骨和脊柱-肩胛骨骨块增强术)用于两种不同类型的合成骨(Synbone和Sawbone)。根据ASTM F2028中定义的“摇马”设置对试样进行循环加载。在骨块上施加170n的中侧力,完整的测试包括5000次循环。使用三维数字图像相关系统测量骨块与关节盂之间的微动。测得的微运动分为增块的不可逆位移和可逆位移。内侧不可逆移位是微动的主要组成部分。当两种类型的合成骨聚集时,脊柱-肩胛骨骨块在内侧方向的不可逆位移明显高于喙骨块(脊柱:1.00±0.39 mm,喙骨:0.56±0.39 mm, p = 0.01)。主要的不可逆内侧位移可以解释为初始沉降行为。
期刊介绍:
The Journal of Medical Engineering & Technology is an international, independent, multidisciplinary, bimonthly journal promoting an understanding of the physiological processes underlying disease processes and the appropriate application of technology. Features include authoritative review papers, the reporting of original research, and evaluation reports on new and existing techniques and devices. Each issue of the journal contains a comprehensive information service which provides news relevant to the world of medical technology, details of new products, book reviews, and selected contents of related journals.