BACKGROUND: A good sport technique in mixed martial arts (MMA) is essential for the good performance of the athlete during the combat. Lower limb injuries could cause changes in his stability and this will decrease the sport performance of the person that practices those disciplines. PURPOSE: To analyze the stability of athletes who have suffered injuries in lower limb and compared it with those that did not have any injury. METHODS: Were selected 44 athletes (38 men and 6 women) with an age between 18 and 47 years, with minimum 6 months of experience in the sport and frequency of training 3 times / week. Then it was made a stabilometry using Romberg’s test with pressure platform BTS P-6000 (sample frequency = 500 Hz) with open eyes (OE) and closed eyes (CE) during 30s. On the time series (TS) obtained from lateral and sagittal displacement a Butterworth filter with cut frequency in 4 Hz and zero phase was used and implemented in Matlab software. TS spectrums were obtained using the FFT and with base on it the energy in the band between 0.5-1.5Hz was obtained (this band shows the power used by the muscle in the recovery of the balance) for each person. Finally was made the hypothesis test using the Wilcoxon method. RESULTS: The average of energy on the sagittal axis for the band 0.5 to 1.5 Hz with OE and no injury was 0.8616 a.u and for CE with no injury was 0.5663 a.u. For the same parameter but with injury and with OE was 0.6900 a.u and for CE the value was 0.7758 a.u. On the lateral axis OE without injury was 1.0436 a.u and for CE was 1.1105 a.u. With the same parameter but with OE and with injury was 1.0948 a.u and for CE was 1.3033 a.u. The unique comparison that showed significant difference in the hypothesis test was between the energies of displacement sagittal for OE Vs CE in individuals with injury. DISCUSSION: Injured athletes had higher energy intake in the range of 0.5 to 1.5Hz, by sagittal component. This may be associated to visual information used during the balance. For this reason it is probably that the variation of the center pressure is increased when the individual has CE. The major change was observed in injured athletes when they close their eyes.