Magnetic Resonance Imaging Evaluation of Changes in Gluteal Muscles After Treatments With the High-Intensity Focused Electromagnetic Procedure.

Abstract

High-intensity focused electromagnetic (HIFEM) field procedure induces changes in the gluteal muscles and improves the aesthetic appearance of the buttocks. This study aims to objectively assess the hypertrophic response of the gluteal muscles after HIFEM treatments. Seven subjects (40.00 ± 6.68 years) received 4, 30-minute HIFEM treatments of the buttocks. Magnetic resonance imaging of the pelvic region was obtained at baseline, 1-month, and 3-month follow-up to reconstruct 3D volumes of musculusgluteus maximus, medius, and minimus. Volumetric changes were calculated and statistically analyzed. Standardized photographs, weight measurements, patient satisfaction, treatment comfort, and adverse events were also documented. Volumetric analysis revealed a significant increase (p = .001) in the size of the examined muscles at 1-month (+10.81 ± 1.60%) and 3-month (+13.23 ± 0.91%) follow-up. A more profound hypertrophic effect was seen in the upper buttock region. This translated into a visible buttock lifting, also captured by patient photography. Gluteal adipose tissue was insignificantly affected. Patients were satisfied, and they found the treatments comfortable. No adverse events were observed. Simultaneous enhancement of gluteal muscles was documented. This represents the first objective evaluation of the HIFEM-induced structural changes in the gluteal muscles and physiologic documentation of the aesthetic improvement previously reported by other authors.