Descriptive Quantitative Analysis of Rearfoot Alignment Radiographic Parameters.

Abstract

Although the radiographic parameters of the transverse talocalcaneal angle (tTCA), calcaneocuboid angle (CCA), talar head uncovering (THU), calcaneal inclination angle (CIA), talar declination angle (TDA), lateral talar-first metatarsal angle (lTFA), and lateral talocalcaneal angle (lTCA) form the basis of the preoperative evaluation and procedure selection for pes planovalgus deformity, the so-called normal values of these measurements are not well-established. The objectives of the present study were to retrospectively evaluate the descriptive statistics of these radiographic parameters (tTCA, CCA, THU, CIA, TDA, lTFA, and lTCA) in a large population, and, second, to determine an objective basis for defining "normal" versus "abnormal" measurements. As a secondary outcome, the relationship of these variables to the body mass index was assessed. Anteroposterior and lateral foot radiographs from 250 consecutive patients without a history of previous foot and ankle surgery and/or trauma were evaluated. The results revealed a mean measurement of 24.12°, 13.20°, 74.32%, 16.41°, 26.64°, 8.37°, and 43.41° for the tTCA, CCA, THU, CIA, TDA, lTFA, and lTCA, respectively. These were generally in line with the reported historical normal values. Descriptive statistical analysis demonstrated that the tTCA, THU, and TDA met the standards to be considered normally distributed but that the CCA, CIA, lTFA, and lTCA demonstrated data characteristics of both parametric and nonparametric distributions. Furthermore, only the CIA (R = -0.2428) and lTCA (R = -0.2449) demonstrated substantial correlation with the body mass index. No differentiations in deformity progression were observed when the radiographic parameters were plotted against each other to lead to a quantitative basis for defining "normal" versus "abnormal" measurements.

• Authors: Andrew J Meyr, Matthew R Wagoner
• Journal: The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons (J Foot Ankle Surg) 2015 Sep-Oct Vol. 54 Issue 5 Pg. 860-71 ISSN: 1542-2224 [Electronic] United States
• PMID: 26002682 (Publication Type: Journal Article)
• Copyright: Copyright © 2015 American College of Foot and Ankle Surgeons. Published by Elsevier Inc. All rights reserved.

Topics

• Adolescent
• Adult
• Age Factors
• Aged
• Child
• Cohort Studies
• Evaluation Studies as Topic
• Female
• Foot (diagnostic imaging)
• Foot Bones (diagnostic imaging)
• Foot Joints (diagnostic imaging)
• Humans
• Male
• Middle Aged
• Radiography
• Reference Values
• Retrospective Studies
• Sensitivity and Specificity
• Sex Factors
• Young Adult