Exoskeletons are wearable assistive devices made to be worn by users to enhance the function of the joint, reduce metabolic costs, and reduce required biological work. This thesis looks at several different types of knee exoskeletons and how they affect the user’s biomechanics and reduce the tibiofemoral force experienced by the user. Tibiofemoral forces are one of the joint contact forces experienced at the knee and are dependent on the level of activity from the surrounding muscles (DeMers et al., 2014). The knee is one of the largest joints in the human body, but is also prone to injury and degradation, with a global incidence of 203 per 10,000 people developing knee osteoarthritis (Cui et al., 2020). Everyone’s step-by-step biomechanics are going very slightly but summed together the muscle activity will be very similar (Ivanenko et al., 2004). This makes it easy to design an exoskeleton for the common man and make slight alterations as needed. Through this literature review, it will be shown that powered exoskeletons can be effective at reducing the tibiofemoral forces during a variety of conditions, and are best suited by targeting the knee extensor muscles.