The Knee injury and Osteoarthritis Outcome Score (KOOS) is a questionnaire designed to assess the discomforts and symptoms of patients with problems related to the knee; it is reliable and validated in the Italian language (KOOS-I).
KOOS-I is a 42-item self-administered questionnaire with five subscales: Pain (P), Symptoms (S), Activities of Daily Living (ADL), Sport and Recreation (Sport/Rec) and Knee-related Quality of Life (QoL).