Meniscal injury can be detected by several functional tests. Using the Thessaly test can improve the physical examination by means of probability of the correct diagnosis, but the results are based on a single study. In patients with ambiguous findings in the physical examination or with suspected combined injury, further diagnostic procedures such as magnetic resonance imaging are necessary to confirm the diagnosis. In clinically certain cases the use of additional diagnostic imaging procedures should be avoided as other authors have shown that with few exceptions this has no influence on the therapy.