Evidence that Swimming May Be Protective of Knee Osteoarthritis: Data from the Osteoarthritis Initiative.

Background: To date, there have not been any epidemiologic studies that have evaluated the association between swimming over a lifetime and knee health.

Objective: The study aimed to evaluate the relationship of a history of swimming with knee pain, radiographic knee OA (ROA), and symptomatic knee OA (SOA).

Design: Cross-sectional retrospective study.