Racket Sports May Worsen Knee Arthritis (IMAGE) Radiological Society of North America Caption MR images of the right knee at baseline (A, C) and after 48 months (B, D). Obese 76-year-old man in the elliptical trainer group (A-B) and obese 59-year-old woman in the racket sport group (C-D). The woman developed severe cartilage damage at the femur and tibia bones (arrows), with associated damage of the meniscus (asterisk). In contrast, no cartilage damage was seen in the man in the elliptical trainer group (A, B). Credit Radiological Society of North America Usage Restrictions May use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.