Dynamic knee valgus is a common biomechanical alteration, particularly in women, and is often associated with hip muscle weakness, especially in the gluteus medius (GM), which plays a key role in controlling knee alignment. In this context, insoles have been proposed as an intervention to modify lower limb biomechanics. However, there is limited evidence on their effect on dynamic valgus correction, gluteus medius strength, and center of pressure (CoP) distribution. This study investigates whether a 2 mm infracapital insole can improve knee alignment, muscle strength, and CoP in adult women with dynamic knee valgus.

The primary objective of this study was to evaluate whether a 2 mm infracapital insole corrects dynamic knee valgus in adult women. Secondary objectives were to evaluate whether the use of this insole influences GM strength and alters CoP distribution, contributing to improved neuromuscular control and postural stability.

This randomized, triple-blind clinical trial included adult female participants with dynamic knee valgus. Subjects were randomly assigned to an intervention group (using a 2 mm infracapital insole) or a control group (using a flat insole). Motion analysis was conducted to assess changes in knee valgus angles, and GM force analysis was performed using an isometric dynamometer. Additionally, a force platform was used to assess CoP displacement, postural stability, and vertical jump time. The study adhered to strict methodological protocols, ensuring blinding of participants, researchers, and statistical analysts.

Participants in the intervention group exhibited a significant reduction in knee valgus angles compared to the control group. Furthermore, analysis of force and vertical jump time indicated a possible increase in GM activation in the intervention group, suggesting an improvement in neuromuscular control. CoP analysis revealed more stable weight distribution and reduced postural sway, indicating greater postural control with the use of the insole. These results support the potential biomechanical benefits of using infracapital insoles in individuals with dynamic knee valgus.

This study provides evidence that a 2 mm infracapital insole can contribute to the correction of dynamic knee valgus, increase GM strength, and improve postural stability by modifying the CoP distribution. These findings suggest that insoles may be a valuable tool for addressing lower limb biomechanics in individuals at risk for knee malalignment. Future studies should explore long-term effects and clinical applications in rehabilitation settings.

The results of this study have significant implications for physical therapy practice, rehabilitation, and injury prevention. The use of a simple, noninvasive intervention such as an infracapital insole may help optimize lower limb biomechanics, reducing injury risk, improving functional performance, and enhancing postural control. These findings may inform clinical guidelines for the treatment of dynamic knee valgus and provide a basis for future research in sports science and orthotic interventions.