Racket Sports May Worsen Knee Arthritis (IMAGE) Radiological Society of North America Caption MR images of the right knee (A, B, C, D) at baseline (A, C) and after 48 months (B, D). Overweight 47-year-old woman in the elliptical trainer group (A-B) and overweight 64-year-old man in the racket sports group (C-D). The man in the racket sports group developed severe cartilage damage at the femur and tibia bones (arrowheads). In contrast, no cartilage damage was seen in the woman 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.