Major Joshua W, Ernst Andrew J, Kallevang Jonathan K, Kaeck Alexander, Grijalva Stephen D, Douglas Thomas J, Wilson Andrew W, Garry Conor B
Department of Radiology, Naval Medical Center Portsmouth, Portsmouth, VA, 23708-2197, USA.
Department of Orthopaedic Surgery, Naval Medical Center Portsmouth, Portsmouth, VA, 23708-2197, USA.
Skeletal Radiol. 2023 Dec;52(12):2461-2467. doi: 10.1007/s00256-023-04368-7. Epub 2023 May 27.
We hypothesize that cut screws will deform in a manner that increases the core and outer diameters of the screw hole compared to uncut controls, and effects will be more pronounced in titanium screws.
We used biomechanical polyurethane foam blocks to simulate cortical bone. We organized four groups of stainless steel and titanium cut and uncut screws. Blocks were fitted with a jig to ensure perpendicular screw insertion. We imaged the blocks using digital mammography and measured them using PACS software. Power analysis determined a power of 0.95 and an alpha error of 0.05.
Highly statistically significant differences in core diameter were found after cutting stainless steel and titanium screws. Cutting stainless steel screws increased core diameter by 0.30 mm (95% CI, 0.16 to 0.45; p < .001). Titanium screws' core diameter increased by 0.45 mm (95% CI, 0.30 to 0.61; p < .001). No significant differences were found in the outer diameters of stainless steel and titanium screws after cutting.
Titanium and stainless steel screw tracts demonstrated screw core diameter and screw thread pattern deformation after cutting. Titanium screws demonstrated more significant effects.
我们假设与未切割的对照螺钉相比，切割螺钉会以增加螺钉孔内径和外径的方式发生变形，并且这种影响在钛螺钉中会更明显。
我们使用生物力学聚氨酯泡沫块模拟皮质骨。我们组织了四组不锈钢和钛制的切割和未切割螺钉。使用夹具确保螺钉垂直插入泡沫块中。我们使用数字乳腺摄影对泡沫块进行成像，并使用PACS软件进行测量。功效分析确定功效为0.95，α错误为0.05。
切割不锈钢和钛螺钉后，在内径上发现了具有高度统计学意义的差异。切割不锈钢螺钉使内径增加了0.30毫米（95%置信区间，0.16至0.45；p <.001）。钛螺钉的内径增加了0.45毫米（95%置信区间，0.30至0.61；p <.001）。切割后不锈钢和钛螺钉的外径未发现显著差异。
钛螺钉和不锈钢螺钉通道在切割后显示出螺钉内径和螺纹模式的变形。钛螺钉的影响更显著。
