Study Links Poor Sleep and Night Shift Work to Increased Osteoarthritis Risk

The study, led by Elizabeth Yanik, an assistant professor in the Department of Orthopaedic Surgery at WashU Medicine, analyzed health data from nearly 500,000 participants enrolled in the UK Biobank, a large biomedical research database. Published in the journal Arthritis Care & Research, the findings indicate that sleep health is an important factor in joint health, alongside traditional risk factors such as age, obesity, and previous joint injuries.

Participants who slept fewer than six hours per night or frequently had difficulty falling or staying asleep showed a 20-40% higher risk of developing hip or knee osteoarthritis compared to those who averaged around seven hours of sleep. Surveys reveal that 17% of Americans over age 50 suffer from osteoarthritis in the hip, while 14% of all U.S. adults have symptomatic knee osteoarthritis.

Additionally, night shift workers were found to have a 24% higher risk of knee osteoarthritis and a 28% increased likelihood of requiring total knee replacement compared to individuals who did not work night shifts. This association remained significant even after controlling for body weight and other health factors. The impact was observed to be stronger for the knee than the hip, suggesting differing effects of circadian rhythms on joint health.

These findings reinforce the growing body of evidence that links sleep and circadian rhythms to inflammation, tissue repair, and pain sensitivity, all factors that may influence the development of osteoarthritis. The associations were evident even among participants without chronic joint pain at the outset, implying that poor sleep may be a contributing factor to the condition rather than a mere consequence. This research underscores the potential for sleep to be a modifiable risk factor that can be targeted alongside physical activity, weight management, and injury prevention to help reduce the risk of osteoarthritis and delay the need for joint replacements.