The Change of the Mechanoreceptor fo Anterior Cruciate Ligament after Injuries of Medial Articular Cartilage and Ligament in the Rabbit / 대한정형외과학회잡지

The aim of this study was to determine whether there are quantitative changes in the mechanoreceptors in the anterior cruciate ligament of unstable knee with injured medial articular cartilage or medial ligament. Twenty specimens of anterior cruciate ligament were obtained from medial articular cartilage injury group and medial ligament injury group, respectively. Forty anterior cruciate ligaments of the other side of knee were used as controls. The ligaments were transected and stained with a modified gold-chloride method. Mechanoreceptors were located almost exclusively in the periligamentous synovial tissue. The results were as follows; 1. Three kinds of mechanoreceptors were found at the surface of each ligament beneath the synovial membrane. 2. The type 2 mechanoreceptor was more common than any other types in all groups. 3. In the medial articular cartilage injury group, the number of mechanoreceptor was significantly decreased and morphologically degradated with synovial degeneration than the control group. The same findings were noted in the medial ligament injury group(P<0.003). 4. There was no statistical difference between the two experimental groups in numher of the mechanoreceptor. In conclusion, the mechanoreceptor of the anterior cruciate ligament of unstable knee with injured medial articular cartilage and ligament in the rabbit were decreased in its numher and were degradated morphologically than the control group. And it was suggested that reduced proprioception in unstable knee might he an another cause of development of osteoarthritis.

Lipoma Arborescens in the Knee Joint: A Case Report

Lipoma arborescens is a rare intra articular lesion consisting of a villous lipomatous proliferation of the synovial lining and occurs mainly in the knee joint. It is mostly found in older patients with joint trauma, meniscal lesions or chronic synovitis. The authors describe one case of a 29-year-old male with multiple lipomas in the right knee joint who has a history of joint trauma. He had joint effusion, pain, giving way and restricted terminal extension of the right knee. Histology and gross findings are consistent with the lipoma arborescens. After arthroscopic excision of the masses, symptom was relieved completely and the patient had gained full range of motion of the right knee joint.