Objective

Preoperative digital templating is a standard procedure in total hip arthroplasty. Deviations between template size and final implant size may result from inaccurate calibration, templating as well as intraoperative decisions. So far, the explicit effect of calibration errors on templating has not been addressed adequately.

Materials and Methods

A mathematical simulation of calibration errors up to ± 24% was applied to the templating of acetabular cups (38 to 72 mm diameter). The effect of calibration errors on template component size as deviation from optimal size was calculated.

Results

The relationship between calibration error and component size deviation is inverse and linear. Calibration errors have a more pronounced effect on larger component sizes. Calibration errors of 2–6% result in templating errors of up to two component sizes. Common errors of up to 12% may result in templating errors of 3–4 sizes for common implant sizes. A tabular matrix visualizes the effect.

Conclusion

Calibration errors play a significant role in component size selection during digital templating. Orthopedic surgeons should be aware of this effect and try to identify and address this source of error.

中文翻译：

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组件尺寸和校准误差对全髋关节置换术数字模板化的影响。来自简单数学模型的视觉矩阵

客观的

术前数字模板化是全髋关节置换术的标准程序。模板尺寸与最终植入物尺寸之间的差异可能是由于校准，模板以及术中决策不准确所致。到目前为止，尚未充分解决校准误差对模板的显式影响。

材料和方法

对髋臼杯（直径38至72 mm）的模板进行了高达±24％的校准误差的数学模拟。计算出校准误差对模板组件尺寸的影响（偏离最佳尺寸）。

结果

校准误差和组件尺寸偏差之间的关系是反比和线性的。校准误差对较大的组件尺寸有更明显的影响。2–6％的校准误差导致最多两个组件尺寸的模板误差。对于常见的植入物尺寸，常见误差高达12％可能导致3-4尺寸的模板误差。表格矩阵将效果可视化。

结论

在数字模板化过程中，校准误差在组件尺寸选择中起着重要作用。整形外科医生应意识到这种影响，并尝试找出并解决这种错误来源。