BACKGROUND Diffuse idiopathic skeletal hyperostosis (DISH) is characterized by the ossification of vertebral bodies and peripheral entheses. However, variations in sacroiliac (SI) joint change in patients with DISH have not been fully clarified. The purpose of this study was to evaluate SI joint variation in patients with DISH in comparison with a non-DISH population. METHODS A total of 342 SI joints in 171 patients (DISH+, n = 86; DISH-, n = 85) who had undergone lumbar spine surgery were analyzed by computed tomography examination. SI joint variations were classified into four types: Type 1, normal or tiny peripheral bone irregularity; Type 2, subchondral bone sclerosis and osteophytes formation; Type 3, vacuum phenomenon; and Type 4, bridging osteophyte and bony fusion. The type of bridging osteophyte in SI joints and the prevalence of ossification in each spinal segment from C1 to SI joint were also examined. RESULTS The most common SI joint variation in the DISH+ group was bony fusion (Type 4), with 71.6% exhibiting anterior paraarticular bridging. On the other hand, SI joint vacuum phenomenon (Type 3) was the most frequent change (57.1%) in the DISH- group. The middle to lower thoracic spine and SI joints were highly affected in DISH and caused bony ankylosis. CONCLUSIONS Anterior paraarticular bridging was the most common type of SI joint change in patients with DISH who underwent lumbar spine surgery. The present results regarding variations of SI joint changes in DISH should help understand the etiology of DISH.

中文翻译：

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diffuse关节变异与弥漫性特发性骨骼肥大有关。

背景技术弥漫性特发性骨骼肥大症（DISH）的特征是椎体和周围骨骼的骨化。但是，DISH患者sa关节（SI）关节变化的变化尚未完全阐明。这项研究的目的是评估与非DISH人群相比，DISH患者的SI关节变异。方法通过计算机断层扫描检查分析171例腰椎手术患者的342个SI关节（DISH +，n = 86； DISH-，n = 85）。SI关节变异分为四种类型：1型，正常或微小的外周骨不规则； 2型，正常或细小。2型，软骨下骨硬化和骨赘形成；类型3，真空现象；和类型4，桥接骨赘和骨融合。还检查了SI关节中桥接骨赘的类型以及从C1到SI关节的每个脊柱节段骨化的发生率。结果DISH +组中最常见的SI关节变异是骨融合（4型），其中71.6％表现为前关节旁桥接。另一方面，在DISH-组中，SI关节真空现象（类型3）是最常见的变化（57.1％）。DISH严重影响了中下胸椎和SI关节，并导致了骨性强直。结论在接受腰椎手术的DISH患者中，前关节旁桥接是最常见的SI关节改变类型。目前有关DISH中SI关节变化的变化的结果应有助于了解DISH的病因。结果DISH +组中最常见的SI关节变异是骨融合（4型），其中71.6％表现为前关节旁桥接。另一方面，在DISH-组中，SI关节真空现象（类型3）是最常见的变化（57.1％）。DISH严重影响了中下胸椎和SI关节，并导致了骨性强直。结论在接受腰椎手术的DISH患者中，前关节旁桥接是最常见的SI关节改变类型。目前有关DISH中SI关节变化的变化的结果应有助于了解DISH的病因。结果DISH +组中最常见的SI关节变异是骨融合（4型），其中71.6％表现为前关节旁桥接。另一方面，在DISH-组中，SI关节真空现象（类型3）是最常见的变化（57.1％）。DISH严重影响了中下胸椎和SI关节，并导致了骨性强直。结论在接受腰椎手术的DISH患者中，前关节旁桥接是SI关节改变的最常见类型。目前有关DISH中SI关节变化的变化的结果应有助于了解DISH的病因。DISH严重影响了中下胸椎和SI关节，并导致了骨性强直。结论在接受腰椎手术的DISH患者中，前关节旁桥接是最常见的SI关节改变类型。目前有关DISH中SI关节变化的变化的结果应有助于了解DISH的病因。DISH严重影响了中下胸椎和SI关节，并导致了骨性强直。结论在接受腰椎手术的DISH患者中，前关节旁桥接是最常见的SI关节改变类型。目前有关DISH中SI关节变化的变化的结果应有助于了解DISH的病因。