Locking occurs when the fragment of torn meniscus gets caught in the hinge mechanism of the knee and will not allow the leg to straighten completely. There are long term effects of a torn meniscus as well. The constant rubbing of the torn meniscus on the articular cartilage may cause wear and tear on the surface, leading to degeneration of the joint. The knee may swell with use and become stiff and tight. This is not unique to meniscus tears, but occurs whenever the knee becomes inflamed.
Diagnosis begins with a history and physical .
The examination will try to determine where the pain is located, whether or not locking has occurred, and if you have any clicks or pops as the knee is moved. X-rays will not show the torn meniscus. X-rays are mainly useful to determine if other conditions are present. The MRI scan is very good at showing the meniscus. Usually, this test is done to look for injuries, such as tears in the menisci or ligaments of the knee.