Title : Calcaneal tuberosity index: A novel radiologic parameter for hindfoot alignment assessment
Abstract:
Background: The conventional method of assessing hindfoot alignment through heel alignment view measurement has shown inaccuracies due to the lack of specific measurement guidelines. This study introduces the Calcaneal Tuberosity Index, a refined X-ray parameter aimed at enhancing accuracy and intuitiveness in hindfoot alignment assessment.
Methods and Materials: A comprehensive study involving 300 patients with various foot conditions was conducted. Weight-bearing radiographs, including teleradiograms, were obtained. Blinded investigators performed radiographic measurements, deriving the novel parameter from the calcaneal tuberosity's shadow analysis in the Ankle Anteroposterior (AP) view. Statistical analysis using SPSS software involved descriptive statistics and Pearson correlation coefficients to assess relationships between radiographic variables and foot conditions.
Results: Significant correlations were found between the Calcaneal Tuberosity Index and the heel alignment angle: horizontal distance from heel contact to talus center (p=0.038, r=0.45), distance from heel contact to mechanical axis extension line intersection with the ground (p=0.00, r=0.71), angle between ground and calcaneal tuberosity shadow's long axis (p=0.05, r=-0.42), and angle between shadow center-talar dome center line and the ground (p=0.034, r=-0.45). However, no significant relationship was observed between tibiofemoral angle and heel alignment.
Conclusion: The study unveils the novel Calcaneal Tuberosity Index, a parameter derived from calcaneal tuberosity shadow analysis in the Ankle AP view, for precise hindfoot alignment assessment. Through meticulous analysis of 300 patients with diverse foot conditions, strong correlations were established between the new parameter and existing heel alignment angle. The Calcaneal Tuberosity Index offers a promising avenue for accurate and intuitive insights into hindfoot alignment, addressing the limitations of traditional methods.
