Abstract

Purpose

Laximeters were designed to diagnose an anterior cruciate ligament (ACL) deficient knee, but their use has now focused on providing an objective assessment of the anterior translation (AT) of an intact and ACL-reconstructed knee. In this study we report the introduction and direct comparison of an automated and computerized AT measurement device, GNRB, with the device previously established by the institute and as the current literature standard, the KT1000.

Methods

A prospective data collection was commenced upon introduction of the GNRB. The measurements of AT in each patient were performed by the same investigator with each device using 134 N applied to both knees, giving a side-to-side difference. The investigators were a sport scientist, a biomechanical engineer and a physiotherapist. Increased AT was defined as a difference > 3 mm.

Results

Three investigators performed the measurements in 122 patients, 9.8 (± 1.8) months after ACL reconstruction. Mean AT of the healthy knee was 5.7 mm with KT1000 and 4.4 mm with GNRB (p = 0.002). Mean AT of the ACL reconstructed knee was 7.0 mm with the KT1000 and 5.3 mm with the GNRB (p = 0.037). The KT1000 had a higher variance of results than the GNRB (p < 0.001). There were 25 patients with increased AT measured by KT1000 compared with 12 patients using the GNRB (p < 0.016), with only 5 on both devices.

Conclusions

GNRB has better consistency of results when compared to the KT1000. Both devices lack comparability for detecting increased AT, with the KT1000 recording a side-to-side difference of more than 3 mm in twice as many patients as the GNRB.

Level of evidence

II.

中文翻译：

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ACL重建后的前膝关节平移测量受所用的腹腔镜类型的影响

摘要

目的

腹膜炎仪设计用于诊断前交叉韧带（ACL）膝关节功能不全，但现在的使用重点是对完整和ACL重建的膝关节的前移（AT）提供客观评估。在这项研究中，我们报告了自动和计算机化的AT测量设备GNRB的介绍，并将其与该研究所先前建立的设备以及作为当前文献标准的KT1000进行了直接比较。

方法

引入GNRB后，便开始了预期的数据收集。由同一名研究人员对每位患者的AT进行测量，每台设备均使用134 N施加在双膝上，产生左右差异。研究人员是运动科学家，生物力学工程师和物理治疗师。AT的增加定义为差异> 3 mm。

结果

ACL重建后9.8（±1.8）个月，三名研究人员对122名患者进行了测量。使用KT1000，健康膝盖的平均AT为5.7 mm，使用GNRB，则为4.4 mm（p  = 0.002）。用KT1000，ACL重建膝关节的平均AT为7.0 mm，对于GNRB，平均AT为5.3 mm（p  = 0.037）。与GNRB相比，KT1000的结果差异更大（p  <0.001）。与使用GNRB的12例患者相比，通过KT1000测量的25例AT升高的患者（p  <0.016），两个设备均只有5例。

结论

与KT1000相比，GNRB具有更好的结果一致性。两种设备都缺乏可检测AT升高的可比性，KT1000在GNRB的两倍患者中记录到的侧向差异超过3 mm。

证据水平

二。