Comparison Analysis of Stress Radiography for the Evaluation of Posterior Knee Laxity / 中国运动医学杂志

ABSTRACT

Objective Stress radiography provides an objective tool to measure posterior knee instability.This study was conducted to evaluate the intraobserver and interobserver reliability of measurements using Telos device to quantify posterior knee instability,compared wim KT-1000 and PDT test for consistency analysis.Methods From October 2008 to June 2009,68 stress radiographs in 34 patients with posterior knee instability were taken using Telos device.The amount of posterior displacement on the radiographs was measured independently by 2 surgeons on 2 separate occasions.Changes in intraclass correlation coefficients(ICCs)were examined to assess the intraobserver and interobserver reliability of the measurement,and were compared with those from KT-1000 and PDT test for consistency analysis.Results Intraobserver ICC was 0.992,while interobserver ICC Was 0.991.There was no significant difierence between Telos and KT-1000 in pair-t test.The data from Telos device was consistent with KT-1000.The coincident ratio Of PDT test was 20% while the posterior displacement of the tibia calculated on stress radiography was 5-10 mm.The coincident ratio of the PDT was 71.4% while the posterior displacement of the tibia calculatcd from stress radiography was 10-15 mm.Conclusion Using Telos device for stress radiograph provides a reproducible method to quantify posterior knee instability,and the consistency between Telos divece and KT-1000 was reliable.The coincident ratio of the PDT test with stress radiography increased when the posterior displacement of the tibia from stress view became more severe.