TY JOUR TI The ultrasound predictors of the progression x-ray negative osteoarthritis to the x-ray positive stage i KW osteoarthritis KW knee joint KW ultrasound examination JO Journal of New Medical Technologies. eJournal AU Titova, L.. AU Valkov, M.. AU Yakobi, A.. AU Yunitsyna, A.. AU Makarova, M.. AU Grzhibovskiy, A.. PY 2015 IS 9 PB INFRA-M Academic Publishing LLC.