The use of knee braces is common, and there is an abundance of different brace types available both "over the counter" and as "prescription devices". The braces are used for a range of knee problems ranging from minor knee discomfort to post-surgical rehabilitation. The available evidence is generally in favour of brace applications although the amount and quality of evidence is moderate to low with a positive benefit-harm balance. However, braces should generally not be used as a stand-alone or primary treatment strategy, but can be used as a potentially beneficial supplement to patients with knee disorders if needed.