The effect of different subtalar joint pronation amount on postural stability and lower extremity arrangements in healthy individuals

The primary aim of our study is to compare the lower extremity alignment and postural stability of healthy individuals with subtalar joints in pronation and hyperpronation alignment. Our second aim is to examine the compensatory changes caused by lower extremity alignment and postural stability as the amount of pronation increases. To work; thirty-nine individuals between the ages of 18-40 who were evaluated using the Foot Posture Index-6 (API-6) and were found to have subtalar joint pronation were included. Participants were divided into two groups according to the increase in subtalar joint pronation values. Participants with a value between 6 and 9 according to API-6 were included in the first group (G1), and participants with a value between 10-12 were included in the second group (G2). All participants; API-6 index, static and dynamic postural stability, foot and ankle usability scale (FAAM), navicular drop test (NDT), frontal plane projection angles (FPPA), calcaneotibial angles (CTA), tibial torsion angles (TT), and femoral internal-external rotation angles (FIR-FER) were measured. All assessments were made once. As a result of the evaluations, were found among the groups API-1 (p=0.001; p<0.05), API-4 (p=0.00; p<0.05), API-5 (p=0.00; p<0.05) and API-T (p=0.000; p<0.05) scores were significantly different. There was also a significant difference between the groups in the mean ND-WB scores (p=0.00; p<0.05). ND-Slump mean score (p=0.05; p>0.05) was found to be borderline significant.