Measurement of varus-valgus and internal-external rotational knee laxities in vivo - Part I: Assessment of measurement reliability and bilateral asymmetry
Measurement of varus-valgus and internal-external rotational knee laxities in vivo - Part I: Assessment of measurement reliability and bilateral asymmetry
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DOI：
10.1002/jor.20397
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发表时间：
2007-08-01
影响因子：
2.8
通讯作者：
Perrin, David H.
中科院分区：
文献类型：
--
作者：
Shultz, Sandra J.;Shimokochi, Yohei;Perrin, David H.
我们通过量化测量一致性和绝对测量误差（N=10）来检验佛蒙特膝关节松弛装置（VKLD）测量内翻(VR)-外翻（VL）和内(INT)-外（EXT）旋转松弛的能力。基于预期的测量误差，我们随后检查了侧对侧差异（N=20）。在所有测量中，膝关节屈曲20度，大腿牢固固定，大腿和小腿施加平衡物，在胫骨股骨关节处产生初始的零剪切和压缩载荷。在非负重状态下，对膝关节施加10 nm扭矩用于VL和VR，在非负重和负重状态下，对INT和EXT施加5 nm扭矩。位置传感器测量角位移（度）。除承重时的INT外，测量一致性为好至优（范围为0.68-0.96），VR-VL的绝对测量误差一般小于2度，INT- ext的绝对测量误差一般小于3-4度。虽然观察到两侧的差异，但它们没有超过绝对测量误差。VKLD可可靠地测量VR-VL和INT-EXT松弛度，具有足够的测量精度以产生临床相关差异。(C) 2007骨科研究学会。Wiley期刊公司出版。
We examined the capabilities of the Vermont Knee Laxity Device (VKLD) in measuring varus (VR)-valgus (VL) and internal (INT)-external (EXT) rotational laxities by quantifying measurement consistency and absolute measurement error (N=10). Based on the expected measurement error, we then examined side-to-side differences (N=20). For all measures, the knee was flexed 20 degrees, the thigh securely fixed, and counterweights applied to the thigh and shank to create an initial zero shear and compressive load across the tibiofemoral joint. A 10-Nm torque was applied to the knee for VL and VR during non-weight-bearing, and a 5-Nm torque was applied for INT and EXT during non-weight-bearing and weight-bearing conditions. Position sensors measured angular displacements (deg). Except for INT during weight bearing, measurement consistency was good to excellent (range, 0.68-0.96), with absolute measurement errors generally less than 2 for VR-VL and 3-4 degrees for INT-EXT. Although side-to-side differences were observed, they did not exceed absolute measurement errors. The VKLD yields reliable measures of VR-VL and INT-EXT laxities, with sufficient measurement precision to yield clinically relevant differences. (C) 2007 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.