http://www.digitaljournal.com/article/363142

New ligament found in human knee

Posted Dec 1, 2013 by Tim Sandle
A new ligament has been identified in the human knee. The bone structure has been named the anterolateral ligament (ALL).
Although medicine has been studying the human body for centuries, one tiny piece in the human knee has gone undiscovered until now: the anterolateral ligament. The discovery came about after researchers in Belgium conducted in-depth examinations of 41 knees from deceased people. They found the new ligament in all but one of them.
The study was led by Dr. Steven Claes, an orthopedic surgeon at the University of Leuven, Belgium. Interviewed by the BBC, Dr. Claes said: "The anatomy we describe is the first precise characterization with pictures and so on, and differs in crucial points from the rather vague descriptions from the past. The uniqueness about our work is not only the fact that we identified this enigmatic structure for once and for all, but we are also the first to identify its function."
The newly identified knee ligament: anterolateral ligament
The newly identified knee ligament: anterolateral ligament
University Hospitals Leuven
In terms of the significance of the new ligament, the researchers explain that occasionally when people injure their anterior cruciate ligament, they suffer what is called "pivot shift," where the knee gives way when it is moved a certain way. This "pivot shift" may be caused by an injury to the newly identified anterolateral ligament, which helps to control the rotation of the tibia, one of the two bones in the lower leg.
The findings have been published in the Journal of Anatomy, in a paper titled "Anatomy of the anterolateral ligament of the knee."