Sydney Orthopaedic Research Institute, Level 1, The Gallery, 445 Victoria Ave, Chatswood, NSW, 2067, Australia.
Knee Surg Sports Traumatol Arthrosc. 2020 Nov;28(11):3639-3646. doi: 10.1007/s00167-020-05950-5. Epub 2020 Apr 2.
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.
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.
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.
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.
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牵张计最初是为了诊断前交叉韧带（ACL）缺失的膝关节，但现在其用途已集中在提供对完整和 ACL 重建膝关节的前向平移（AT）的客观评估上。在这项研究中，我们报告了一种自动和计算机化的 AT 测量设备 GNRB 的引入和直接比较，该设备与研究所先前建立的、目前文献标准的 KT1000 设备进行了比较。
在引入 GNRB 时开始进行前瞻性数据收集。每位患者的 AT 测量均由同一位研究人员使用两种设备进行，每侧膝关节施加 134N 的力，以获得侧间差异。研究人员包括一名运动科学家、一名生物力学工程师和一名物理治疗师。增加的 AT 定义为差异>3mm。
三名研究人员在 122 名患者中进行了测量，这些患者在 ACL 重建后 9.8（±1.8）个月。健康膝关节的平均 AT 为 5.7mm，使用 KT1000 测量；使用 GNRB 测量为 4.4mm（p=0.002）。ACL 重建膝关节的平均 AT 为 7.0mm，使用 KT1000 测量；使用 GNRB 测量为 5.3mm（p=0.037）。KT1000 的结果方差大于 GNRB（p<0.001）。使用 KT1000 测量有 25 名患者的 AT 增加，而使用 GNRB 测量有 12 名患者的 AT 增加（p<0.016），只有 5 名患者两种设备均显示 AT 增加。
与 KT1000 相比，GNRB 的结果一致性更好。两种设备在检测 AT 增加方面均缺乏可比性，KT1000 记录的侧间差异大于 3mm 的患者数量是 GNRB 的两倍。
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