Osteoarthritis and Symptoms
Nocturnal Knee Pain Increases With the Severity of Knee Osteoarthritis, Disturbing Patient Sleep Quality
Article first published online: 26 JUN 2014
Copyright © 2014 by the American College of Rheumatology
Arthritis Care & Research
Volume 66, Issue 7, pages 1027–1032, July 2014
How to Cite
Sasaki, E., Tsuda, E., Yamamoto, Y., Maeda, S., Inoue, R., Chiba, D., Okubo, N., Takahashi, I., Nakaji, S. and Ishibashi, Y. (2014), Nocturnal Knee Pain Increases With the Severity of Knee Osteoarthritis, Disturbing Patient Sleep Quality. Arthritis Care Res, 66: 1027–1032. doi: 10.1002/acr.22258
- Issue published online: 26 JUN 2014
- Article first published online: 26 JUN 2014
- Accepted manuscript online: 27 JAN 2014 01:45PM EST
- Manuscript Accepted: 3 DEC 2013
- Manuscript Received: 29 AUG 2013
- Ministry of Education, Culture, Sports, Science and Technology of Japan. Grant Number: 18200044
- Japanese Society for the Promotion of Science. Grant Number: 21500676
- Japanese Orthopaedic Association–Subsidized Science Project Research
Sleep disturbances frequently accompany chronic pain from osteoarthritis (OA). Effective management of sleep disturbances may require successful treatment of chronic pain, a key factor in the clinical evaluation of knee OA. However, the relationship between the severity of knee OA and sleep quality is unclear. Our purpose was to correlate the prevalence of nocturnal knee pain with different OA severity levels and to determine its influence on sleep quality.
Subjects included 1,214 local volunteers with mean ± SD age 58.1 ± 13.0 years. The existence and severity of knee OA were determined by the Kellgren/Lawrence (K/L) grade, and joint space widths were measured. The presence of nocturnal knee pain and Knee Injury and Osteoarthritis Outcome Scores (KOOS) were assessed by self-completed questionnaires. Sleep quality was evaluated by the Pittsburgh Sleep Quality Index. Knee-related factors affecting sleep quality were detected using statistical methods.
The prevalence of nocturnal knee pain was 3.6%, 6.9%, 19.4%, 32.7%, and 75.0% in K/L grades 0, 1, 2, 3, and 4, respectively. Also, prevalence significantly increased with OA severity (P < 0.001). Sleep problems also increased with K/L grade (P = 0.038), and KOOS quality of life (QOL) was significantly lower in those with OA and sleep problems. Logistic regression showed that sleep problems were related to joint space narrowing (P = 0.016) and nocturnal knee pain (P = 0.039). Severe OA also disturbed onset and maintenance of sleep.
The prevalence of nocturnal knee pain and sleep problems increased with the severity of OA, impacting QOL. These results suggest the necessity of appropriate nocturnal pain control.