Atypical synovial chondromatosis of the right knee: A case report.

Synovial chondromatosis, also known as synovial osteochondromatosis, is a rare, benign condition characterized by the formation of multiple cartilaginous nodules in the synovium of facet spaces. Synovial chondromatosis affects many joints, the knee being the most common. The present report examined a 47-year-old male with symptoms of swelling and pain in the right knee, who was admitted to hospital in September 2015. Following admittance, arthroscopic explorations were conducted. Viscous fluid and multiple cartilage-like clumps were identified in the patient's joints during surgery. There was evidence of synovial hyperemia and edema in the inner and outer lateral recesses of the patellar bursa, accompanied by villous projections. Synovium debridement and removal of cartilage-like free masses were performed. Following 6-month follow-up, the motion of the right knee ranged from 0-150° and no further swelling or pain was experienced by the patient. Following arthroscopy, the international knee documentation committee function score improved from 70.6 to 89.4 points. The results of the present report indicate that arthroscopic exploration is an effective treatment for patients with synovial chondromatosis.