The torn or degenerated meniscus and its relationship to degeneration of the weight-bearing areas of the femur and tibia.

Data was collected on 300 cadaver knees dissected for the prime purpose of studying chondromalacia of the patella. Simultaneous observations were also made on the state of the meniscus and the articular cartilage in the tibio-femoral joint. The data did not seem to support the oft-repeated statement that the torn meniscus is the primary cause of unicompartmental osteoarthritis. Investigations were also carried out on 69 additional cadaver knees and 100 consecutive unselected arthroscoped knees in which there was damage either to the meniscus or the adjacent joint surfaces. In 60% of the combined series of cadaver and arthroscoped knees, the meniscal changes could not be correlated with the condition of the articular cartilage. In the remaining 40% in which there was coexisting pathology in the meniscus and the articular cartilage, a cause and effect relationship could not be established, but there was no evidence that a torn meniscus posed a significant threat to the articular cartilage.