Multiple Intraarticular Osteochondromas of the Knee

Osteochondroma is the most common benign growing bone tumor that usually affects the knee joint area. It often involves the long bone metaphysis, which occurs extraarticularly. Despite this, single intraarticular osteochondroma is rarely reported in the literature, but multiple knee osteochondromas is very rare and has not been reported so far. The patient who is introduced is a 30-year-old woman who has undergone two arthrotomy surgeries of the left knee, in which intraarticular osteochondroma was reported in the pathology. In the second operation, due to the size of the lesion and the involvement of the patella, the surgeon had to perform a patellectomy. The patient was referred with severe knee pain and inability to flexion and extension the knee and was unable to walk without a walker. Due to severe osteoarthritis and lack of extensor mechanism and condition of multiple intraarticular osteochondromas of the knee, complete excision of multiple osteochondroma lesions was performed for the patient and Rotating Hinge Knee (RHK) prosthesis was implanted. During two years of treatment follow-up, there is no recurrence of the lesion and the patient walks without a walker and is able to flex the knee 100 degrees. Her knee pain was also relieved.