| Summary: | 碩士 === 國立中正大學 === 機械系 === 90 === Plica are some of the normal synovial structures of the knee joint cavity. They are remnants of the mesenchymal tissue that occupies the space between the distal femoral and proximal tibial epiphyses in the 8-week-old embryo. The incomplete resorption leaves synovial pleats in most of the knee. The superior and the inferior plica are the most common (50% to 65%) but have extremely little clinical relevance. Each may be of many various morphological types. The lateral plica is rare (1% to 3%). The medial plica is present at autopsies in one of every three or four knees.Arthroscopy allows a very precise assessment of the plica, including dynamic examination. It looks for medial impingement against the patellofemoral articular surfaces and secondary (localized chondromalacia) as well as incidentally associated other knee pathologic conditions.The plica causes symptoms such as pain, crepitus, snapping or popping, or effusion related to patellofemoral joint motion. Histologic examination often confirms the chronic conflict between the plica and the femoral condyle.The purpose of this study is using Tytron microforce testing machine to find out the biomechanical properties of different types of medial plica in subjects of different age groups, and to perform three-dimensional finite element contact stress between the plica and the cartilage of the human knee joint. The results of this study can provide valuable information about the relationship between the young’s modulus and the fiber’s ratio of the plica, and how the plica affect the cartilage of the human knee joint.
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