Department of Orthopaedic Surgery, National Hospital Organization Tokyo Medical Center, 2-5-1, Higashigaoka, Meguro-ku, Tokyo, 152-8902, Japan.
Department of Orthopaedic Surgery, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan.
BMC Musculoskelet Disord. 2020 Nov 12;21(1):741. doi: 10.1186/s12891-020-03773-6.
Calcific tendinitis of the rotator cuff is a disorder that causes acute onset of shoulder pain when spontaneous resorption of the calcification occurs. However, factors that trigger calcium resorption have not been clarified. The present study aimed to investigate the association between the onset of calcium resorption in calcific tendinitis and the season of onset.
We retrospectively reviewed 195 patients (female, 116; male, 79; mean age, 62.6 ± 14.2 years; median age, 62 [52, 73] years) diagnosed with the postcalcification stage of calcific tendinitis, which was defined as acute calcific tendinitis in this study, between 2006 and 2018. The onset date of acute calcific tendinitis for each patient was collected from clinical notes. We evaluated the incidence of acute calcific tendinitis in each season and month. Furthermore, we investigated the correlation between the incidence of acute calcific tendinitis and the mean monthly temperature or humidity levels for each year.
The most common season of acute calcific tendinitis onset was summer (35.4%), followed by spring (24.6%), autumn (24.1%), and winter (15.9%) (P = 0.002). Monthly analyses showed the highest peak of onset was in July (15.4%) and the lowest peak was in February (3.1%) (P = 0.022). The incidence of acute calcific tendinitis had a weak association with mean monthly temperature (R = 0.066; P = 0.001) but was not associated with mean monthly humidity levels (R = 0.018; P = 0.099).
This study provides new information on seasonal variation of acute calcific tendinitis onset. The results of this study indicated that the onset of calcium resorption occurs most frequently in the summer in Japan; however, the reasons for seasonal variation remain unclear, and further studies will be needed.
Level III.
肩袖钙化性肌腱炎是一种疾病，当钙化自行吸收时会突然出现肩部疼痛。然而，触发钙吸收的因素尚不清楚。本研究旨在探讨钙化性肌腱炎钙吸收的开始与发病季节之间的关系。
我们回顾性分析了 195 例（女性 116 例，男性 79 例；平均年龄 62.6±14.2 岁；中位数年龄 62[52,73]岁）2006 年至 2018 年间被诊断为钙化性肌腱炎钙化后阶段的患者。每位患者的急性钙化性肌腱炎发病日期均从临床记录中收集。我们评估了每个季节和月份急性钙化性肌腱炎的发病率。此外，我们还调查了急性钙化性肌腱炎的发病率与每年平均每月温度或湿度水平之间的相关性。
急性钙化性肌腱炎发病最常见的季节是夏季（35.4%），其次是春季（24.6%）、秋季（24.1%）和冬季（15.9%）（P=0.002）。每月分析显示发病高峰在 7 月（15.4%），最低高峰在 2 月（3.1%）（P=0.022）。急性钙化性肌腱炎的发病率与平均每月温度呈弱相关（R=0.066；P=0.001），但与平均每月湿度水平无关（R=0.018；P=0.099）。
本研究提供了急性钙化性肌腱炎发病季节性变化的新信息。本研究结果表明，钙吸收的开始在日本夏季最常见；然而，季节性变化的原因尚不清楚，需要进一步研究。
III 级。
