Surgical procedures on the knee result in a considerable reduction in the ability of the patient to actively extend that joint, which makes the physical therapy treatment more complex and compromises the operated patient functioning. The aim of this study was to identify scientific evidences related to the use of biofeedback/EMG in the physical therapists clinical practice. A Medline and PEDro search was performed and three scientific articles were selected. Two examiners independently evaluated the methodology of the studies using the PEDro scale. Only one study presented a score equal or bigger than 5 in the methodological evaluation, which represents high quality according to the punctuation parameters previously defined. The remaining studies presented scores 4, in a uniform manner. However, the study that presented the bigger score did not meet with the first item of the PEDro scale, related to the participants inclusion criteria, which compromises its external validity and the generalization of its results. The present study did not identify reliable scientific information to support the recommendation or rejection of the biofeedback/EMG usage by physical therapists in the postoperative period following knee surgery. Methodological bias of the evaluated studies did not allow stating that the positive findings observed in all studies could be achieved at the clinic during the physical therapy treatment.

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