TOP 5 GLUTEUS MEDIUS EXERCISES A muscle that is commonly weak in hip osteoarthritis is the gluteus medius (and minimus), which stabilizes the hip in the frontal plane. Reiman et al. (2012) have done a literature review which evaluated different EMG studies according to their activation of the gluteus medius. Be careful, as EMG studies only measure detects depolarizations and hyperpolarizations and we cannot necessarily draw firm conclusions for force production, hypertrophy and strength. (Vigots