An analysis of radiologic and anatomical parameters associated with medial osteochondral lesions of the talus in non-traumatic cases.

The study aimed to provide a comprehensive analysis of radiological and anatomical measurements in patients with medial osteochondral lesions of the talus (OLT), particularly those without a history of trauma. The retrospective cross sectional study evaluated 23 medial OLT individuals aged 18-45 with no history of trauma who were identified by magnetic resonance imaging (MRI) between 2016 and 2020. The control group consisted of 27 individuals between the ages of 18 and 45 who did not have OLT and applied for other reasons. Measurements were performed with 16 parameters from anteroposterior (AP) and lateral weight-bearing ankle conventional radiographs (CR). All individuals' demographic data were assessed. A total of 50 patients aged 18-45 years, including 26 males and 24 females with a mean age of 30.28±4.46 years, were evaluated in the study. No significant differences in age or gender were found between the groups (P>0.05). Analysis of both the OLT and control groups revealed a significant association of decreased talar declination angle (P<0.001) and Meary-Tomeno's angle (P = 0.003) with medial OLT. There was no relationship between other radiological parameters and medial OLT development. In conclusion, a decreased talar declination angle and a decreased Meary-Tomeno's angle appear to have significant relationship with development of medial OLT in individuals without a history of trauma. These findings also indicate that a possible cause of medial OLT is a lower-angled positioning of the talus relative to the ground and the first metatarsus in the sagittal plane. Level of Clinical Evidence: Level 3 cross sectional study.