Diagnostic and Interventional Radiology Unit, IRCCS Istituto Ortopedico Rizzoli (IOR), 40136, Bologna, Italy.
Medicine & Rheumatology Unit, IRCCS Istituto Ortopedico Rizzoli (IOR), Ortopedico Rizzoli, via G.C. Pupilli 1, 40136, Bologna, Italy.
Clin Rheumatol. 2022 Feb;41(2):483-490. doi: 10.1007/s10067-021-05925-y. Epub 2021 Sep 27.
Osteitis condensans ilii (OCI) is a benign condition characterised by triangular sclerosis of the iliac bone which may mimic radiographic sacroiliitis. Prevalence is estimated between 0.9 and 2.5%, with female predominance, but the most recent article reporting original epidemiological data in the general population was published in 1971. The aim of our study is to contribute updated figures about prevalence of OCI in Italy.
A retrospective review of pelvic radiographs was conducted. Consecutive patients visiting the emergency department of our Institution between 1st January and 31st December 2020 were enrolled. Individuals with a past diagnosis of axial spondyloarthritis were excluded. Presence of OCI was evaluated by two musculoskeletal radiologists. Clinical and radiologic features such as osteoarthritis and insertional enthesopathy were also assessed.
We included 1047 individuals (61% female) with a median age of 74 years. OCI was present in 10 cases, accounting for a prevalence in the general population of 1.0% (95% CI 0.5-1.7). All patients with OCI were women and, in the female sample, prevalence was 1.6% (95% CI 0.7-2.8). Clinical characteristics and associated radiographic features were not different between patients with OCI and women without OCI.
The prevalence of OCI observed in our study is consistent with previous literature, and we confirm that it is more frequently retrieved in women. Longitudinal research is warranted to elucidate the evolution, while knowledge about the disorder is needed to raise the awareness of rheumatologists and radiologists and to properly identify and report the condition. Key Points • OCI may mimic sacroiliitis and is a major differential diagnosis of radiographic axial spondyloarthritis. • Prevalence of OCI in our sample is 1.0%, in line with previous literature. • OCI predominantly affects women, and our study suggests that the disorder can be incidentally identified even after childbearing age. • Increased awareness of the characteristics of OCI can facilitate identification and reporting of the disorder.
骨化性骨炎（OCI）是一种良性疾病，其特征为髂骨三角形硬化，可能类似于放射性骶髂关节炎。其患病率估计在 0.9%至 2.5%之间，女性居多，但最近一篇报告普通人群中原始流行病学数据的文章发表于 1971 年。本研究旨在提供意大利 OCI 患病率的最新数据。
回顾性分析我院急诊科 2020 年 1 月 1 日至 12 月 31 日期间连续就诊的骨盆 X 线片。排除既往诊断为中轴型脊柱关节炎的患者。两名肌肉骨骼放射科医生评估 OCI 的存在。还评估了骨关节炎和插入性肌腱病等临床和放射学特征。
共纳入 1047 名患者（61%为女性），中位年龄为 74 岁。OCI 见于 10 例，普通人群患病率为 1.0%（95%CI0.5-1.7）。所有 OCI 患者均为女性，在女性样本中，患病率为 1.6%（95%CI0.7-2.8）。OCI 患者与无 OCI 的女性患者的临床特征和相关放射学特征无差异。
本研究观察到的 OCI 患病率与既往文献一致，我们证实其更常见于女性。需要进行纵向研究以阐明其演变，同时需要了解该疾病的知识，以提高风湿病学家和放射科医生的认识，并正确识别和报告该疾病。
OCI 可能类似于骶髂关节炎，是放射学中轴型脊柱关节炎的主要鉴别诊断。
我们样本中 OCI 的患病率为 1.0%，与既往文献一致。
OCI 主要影响女性，我们的研究表明，即使在生育年龄后，该疾病也可以偶然发现。
提高对 OCI 特征的认识有助于识别和报告该疾病。
