Too much or too little activity bad for knees

Both very high and very low levels of physical activity can accelerate the degeneration of knee cartilage in middle-aged adults, according to a new study.

Researchers at the University of California in San Francisco (UCSF) previously had found an association between physical activity and cartilage degeneration.

For the new study, the UCSF researchers looked at changes in knee cartilage among a group of middle-aged adults over a four-year period. They used magnetic resonance imaging (MRI)-based T2 relaxation times to track the evolution of early degenerative cartilage changes in the knee.

“T2 relaxation times generated from MR images allow for analysis of the biochemical and molecular composition of cartilage,” said researcher Wilson Lin. “There is increased water mobility in damaged cartilage, and increased water mobility results in increased T2
relaxation time,” Lin said.

The researchers analysed 205 patients, age 45 to 60, from the UCSF-based Osteoarthritis Initiative, a nationwide study. Participants used a questionnaire to record their physical activity. The researchers measured T2 values of cartilage at the patella, femur and tibia of the right knee joint at baseline and at two- and four-year visits.According to the results of the study, participating frequently in high-impact activities, such as running, appears associated with more degenerated cartilage and potentially a higher risk for development of osteoarthritis.

“When we compared the scores among groups, we found an accelerated progression of T2 relaxation times in those who were the most physically active,” said Thomas M Link, professor of radiology and chief of musculoskeletal imaging at UCSF.
“Those who had very low levels of activity also had accelerated progression of T2 values. This suggests that there may be an optimal level of physical activity to preserve the cartilage,” Link said in a statement.

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