![]() ![]() However, achieving consistent accuracy in the measurement of radiographic parameters is not always feasible. ![]() Given their practical significance, ensuring the accuracy and reproducibility of radiographic measurements is imperative. This applies not only to osteoarthritis, but also encompasses cases involving fractures, cartilage lesions, ligament injuries, and meniscus tears. In particular, radiographic assessments in the coronal plane, i.e., measurements on anteroposterior (AP) images, are the most prominently utilized in clinical practice. Similarly, postoperative radiographic measurements play a crucial role in the assessment following surgery and can substantially impact the postoperative management of patients. The preoperative radiographic measurements in various knee surgeries, such as high tibial osteotomy and total knee arthroplasty, are critically important for planning the surgery, as they can significantly influence surgical outcomes. Given the occasional challenge in accurately identifying the knee joint line in patients with a relatively large PTS, careful measurement of radiographic parameters is crucial and utilizing repetitive measurements for verification may contribute to minimizing measurement errors.Īn evaluation of radiographic parameters in the management of knee disorders and injuries is essential for treatment planning and outcome assessment. The larger the PTS, the lower the measurement reliability regarding the radiographic parameters of the knee that includes the joint line, such as MPTA and JLCA. Similar trends were observed in the comparisons of intra-observer reliability and Bland-Altman plots also showed consistent results. The inter-observer reliability of the MPTA and JLCA decreased as the PTS increased (ICCs for MPTA in Groups A, B, and C: 0.889, 0.796, and 0.790, respectively ICCs for JLCA in Groups A, B and C: 0.916, 0.859, and 0.843, respectively), whereas there were no remarkable differences in other variables. ![]() ![]() As the intra- and inter-observer reliability for PTS ranged over 0.9, grouping was performed based on the average of the measured PTSs. ResultsĪ total of 175 limbs (86 patients) were included in this study. The intra- and inter-observer agreements were assessed using the kappa coefficients, intra-class correlation coefficients (ICC), and Bland-Altman plots. Subjects were classified into 3 groups according to PTS (group A, PTS < 4° group B, PTS ≥ 4° and < 8° group C, PTS ≥ 8°), and the measurement reliability for the radiographic variables was compared between groups. Radiographic parameters related to the knee joint characteristics such as osteoarthritis grade, hip-knee-ankle angle, weight-bearing line ratio, medial proximal tibial angle (MPTA), lateral distal femoral angle, joint-line convergence angle (JLCA), and PTS were measured. The medical records of patients who took full-length anteroposterior radiographs of the lower limb between January 2020 and June 2022 were evaluated retrospectively. Therefore, this study aimed to investigate the effect of PTS on the measurement reliability regarding the radiographic parameter of the knee. Despite this potential impact, there is a lack of prior research investigating how PTS affects the accuracy of these measurements. Posterior tibial slope (PTS) exhibits considerable variability among individuals and is anticipated to influence the accuracy of radiographic measurements related to the knee. ![]()
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