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首页> 外文期刊>Journal of Biomechanics >The human patellar tendon moment arm assessed in vivo using dual-energy X-ray absorptiometry
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The human patellar tendon moment arm assessed in vivo using dual-energy X-ray absorptiometry

机译：使用双能X射线吸收法在体内评估人pa腱肌臂

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摘要

Accurate assessment of muscle-tendon forces in vivo requires knowledge of the muscle-tendon moment arm. Dual-energy X-ray absorptiometry (DXA) can produce 2D images suitable for visualising both tendon and bone, thereby potentially allowing the moment arm to be measured but there is currently no validated DXA method for this purpose. The aims of this study were (i) to compare in vivo measurements of the patellar tendon moment arm (dPT) assessed from 2D DXA and magnetic resonance (MR) images and (ii) to compare the reliability of the two methods. Twelve healthy adults (mean±SD: 31.4±9.5yr; 174.0±9.5cm; 76.2±16.6kg) underwent two DXA and two MR scans of the fully extended knee at rest. The tibiofemoral contact point (TFCP) was used as the centre of joint rotation in both techniques, and the dPT was defined as the perpendicular distance from the patellar tendon axis to the TFCP. The dPT was consistently longer when assessed via DXA compared to MRI (+3.79±1.25mm or +9.78±3.31%; P0.001). The test-retest reliability of the DXA [CV=2.13%; ICC=0.94; ratio limits of agreement (RLA)=1.01 (*/÷1.07)] and MR [(CV=2.27%; ICC=0.96; RLA=1.00 (*/÷1.07)] methods was very high and comparable between techniques. Moreover, the RLA between the mean DXA and MRI dPT values [1.097 (*/÷1.061)] demonstrated very strong agreement between the two methods. In conclusion, highly reproducible dPT measurements can be determined from DXA imaging with the knee fully extended at rest. This has implications for the calculation of patellar tendon forces in vivo where MR equipment is not available.
机译：体内肌腱力的准确评估需要了解肌腱力矩臂。双能X射线骨密度仪（DXA）可以生成适合于可视化肌腱和骨骼的2D图像，从而潜在地可以测量力矩臂，但目前尚无为此目的经过验证的DXA方法。这项研究的目的是（i）比较从2D DXA和磁共振（MR）图像评估的pa骨肌腱臂（dPT）的体内测量结果，以及（ii）比较这两种方法的可靠性。对十二名健康成年人（平均±SD：31.4±9.5岁; 174.0±9.5厘米; 76.2±16.6公斤）进行了两次DXA和两次MR扫描，检查它们完全处于静止状态。在这两种技术中，胫骨接触点（TFCP）被用作关节旋转的中心，而dPT被定义为从tell腱轴到TFCP的垂直距离。通过DXA评估时，与MRI相比，dPT持续时间更长（+ 3.79±1.25mm或+ 9.78±3.31％; P <0.001）。 DXA的重测可靠性[CV = 2.13％; ICC = 0.94;协议的比率限制（RLA）= 1.01（* /÷1.07）]和MR [（CV = 2.27％; ICC = 0.96; RLA = 1.00（* /÷1.07）]]方法非常高，并且在技术之间具有可比性。 DXA和MRI dPT平均值[1.097（* /÷1.061）]之间的RLA证明了这两种方法之间的一致性非常强，因此，可以通过DXA成像在膝盖完全伸展时确定高重复性的dPT测量结果。对于无法使用MR设备的体内for骨肌腱力的计算有影响。

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