When people think about the consequences of poor sleep, they often think about feeling tired, having difficulty concentrating, or struggling with mood changes. But scientists are finding that sleep problems may affect much more than the brain.
According to new research, poor sleep and night-shift work may also increase the risk of developing osteoarthritis and eventually needing major joint surgery.
Osteoarthritis is the most common form of arthritis. It develops slowly over many years as cartilage inside the joints gradually wears away. Cartilage acts as a smooth protective cushion between bones.
When it becomes damaged, movement becomes more difficult and painful. The condition most commonly affects the knees and hips because these joints carry much of the body’s weight.
For some people, osteoarthritis progresses to the point where everyday activities become challenging. Walking, climbing stairs, standing for long periods, or getting in and out of a chair may become painful. In severe cases, doctors may recommend joint replacement surgery to restore mobility and reduce pain.
Traditionally, experts have focused on factors such as age, obesity, previous injuries, and genetics as major causes of osteoarthritis. However, researchers at WashU Medicine wanted to determine whether sleep habits might also contribute.
Using information from the UK Biobank, a major research database containing health records from hundreds of thousands of people, the investigators examined nearly 500,000 participants. Their results were published in Arthritis Care & Research.
The analysis found that people who slept less than six hours per night were significantly more likely to develop osteoarthritis than people who slept approximately seven hours. Frequent sleep problems, including difficulty falling asleep or waking repeatedly during the night, were also linked to increased risk.
Depending on the type of sleep problem, participants experienced roughly 20% to 40% higher risks of developing hip or knee osteoarthritis. These increases are substantial when applied to large populations because osteoarthritis is already extremely common among older adults.
The researchers also looked closely at people who worked night shifts. Shift work disrupts the body’s internal biological clock, which helps regulate sleep, hormone production, metabolism, and many other bodily functions.
Night-shift workers showed notably higher risks of knee-related problems. Compared with people who did not work nights, they had a 24% higher risk of knee osteoarthritis and a 28% higher risk of requiring knee replacement surgery. These findings remained significant even after researchers accounted for body weight and other health differences.
Scientists suspect that disrupted sleep and altered circadian rhythms may contribute to inflammation and interfere with the body’s natural repair systems. During sleep, tissues throughout the body undergo maintenance and recovery. If sleep is consistently shortened or disrupted, these repair processes may become less effective.
Another possible explanation involves pain regulation. Poor sleep can make people more sensitive to pain signals. It may also increase levels of inflammatory chemicals that can contribute to joint damage over time.
An especially important finding was that the association existed even among participants who did not have chronic joint pain when the study began. This reduces the likelihood that sleep problems were simply caused by existing osteoarthritis.
The study adds to a growing body of evidence suggesting that sleep should be considered an important part of long-term health. While maintaining a healthy weight and staying physically active remain critical for protecting joints, getting enough high-quality sleep may deserve equal attention.
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Source: Washington University School of Medicine in St. Louis.
