Genu Varum Correction with HA Filler Volumisation of the Medial Gastrocnemius.

backgroundGenu varum, or bow-legged deformity, involves an outward curvature of the lower limbs, often creating a visible gap between the knees when the ankles are together. Traditionally treated with invasive surgical methods like high tibial osteotomy, genu varum correction now includes less invasive options for patients with mild to moderate deformities. This commentary explores a novel approach using hyaluronic acid (HA) filler to volumise the medial gastrocnemius muscle, thereby improving calf contour and stability without surgery. HA filler injections support the retaining ligaments of the medial gastrocnemius, creating a balanced aesthetic while potentially rebalancing knee and ankle forces for enhanced stability. Two cases are presented: a 30-year-old female with moderate genu varum and a 26-year-old female with mild genu varum, both showing improved calf symmetry, reduced bow-legged appearance, and enhanced postural confidence post-treatment. Although not a replacement for surgical correction in severe cases, HA filler volumisation offers a promising option for aesthetic and functional improvement in mild to moderate genu varum cases. Further research may support the biomechanical benefits of this technique in non-surgical genu varum correction, highlighting the expanding role of fillers in lower limb aesthetics and stability. LEVEL OF EVIDENCE IV: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .