ALL was discovered by Dr. Steven Claes and Dr. Johan Bellemans from University Hospitals Leuven who have been conducting research into ACL tears over the past four years.
They looked into a theory made by a French surgeon in 1879, which claimed that an unknown ligament existed on the anterior of the human knee. After conducting a broad cadaver study using macroscopic dissection techniques, Claes and Bellemans found this theory to be correct. Their research showed that pivot shift occurs when there is additional injury in the ALL.
The discovery, which was detailed in the Journal of Anatomy, could signal a breakthrough for the future of treatment for ACL injuries.