Trader J E, Johnson R P, Kalbfleisch J H
J Bone Joint Surg Am. 1979 Dec;61(8):1217-20.
The bone-mineral content of seventeen intact forearms from eleven cadavera was determined by the non-invasive photon-absorptiometric scanning technique (Norland-Cameron Bone-Mineral Analyzer). Each radius was then removed and three surgical screws were implanted. The forces required to push out the screws retrograde were used to represent the security of mechanical fixation and were correlated with bone-surface hardness and bone-mineral content. A high degree of correlation (r = 0.89 or more) was found between bone-mineral content and the force required for extraction. A much lower correlation existed between surface hardness and extraction force (r = 0.30). We concluded that surface hardness does not correlate well with the screw-holding capacity of bone but that bone-mineral content, as determined by a non-invasive means, does so within a 10 per cent error.
This study demonstrates a high degree of positive correlation between bone density and the security of screw fixation in the human radius. Measuring bone density using a highly accurate, non-invasive, safe technique has clinical relevance in preoperative assessment of osteopathic patients who are being considered for internal fixation of the radius with plates and screws.
使用非侵入性光子吸收扫描技术（诺兰德 - 卡梅隆骨矿物质分析仪）测定了来自11具尸体的17只完整前臂的骨矿物质含量。然后取出每根桡骨并植入3颗外科螺钉。用于逆行推出螺钉所需的力被用来表示机械固定的安全性，并与骨表面硬度和骨矿物质含量相关联。发现骨矿物质含量与拔出所需的力之间存在高度相关性（r = 0.89或更高）。表面硬度与拔出力之间的相关性则低得多（r = 0.30）。我们得出结论，表面硬度与骨的螺钉固定能力相关性不佳，但通过非侵入性方法测定的骨矿物质含量在10%的误差范围内具有相关性。
本研究表明人体桡骨的骨密度与螺钉固定安全性之间存在高度正相关。使用高度准确、非侵入性、安全的技术测量骨密度在对考虑采用钢板和螺钉进行桡骨内固定的骨病患者进行术前评估时具有临床意义。
