Lincoln T L, Mubarak S J
Department of Orthopaedics, University of California at San Diego 92103.
J Pediatr Orthop. 1994 Jul-Aug;14(4):454-7. doi: 10.1097/01241398-199407000-00006.
A delay in diagnosis of a traumatic radial-head dislocation in the absence of a concurrent ulnar fracture is common. Published reports of this injury imply an isolated injury to the radius without involvement of the ulna. This hypothesis is challenged by a retrospective study of all cases over an 8-year period that demonstrates an identifiable injury to the ulna in every case. A new radiographic sign, the "ulnar bow sign," is described to assist in the proper recognition of this injury pattern. A radial-head dislocation or subluxation should be suspected if the posterior border of the ulna on a true lateral radiograph deviates > 0.01 mm from a straight line.
在没有并发尺骨骨折的情况下，创伤性桡骨头脱位的诊断延迟很常见。关于这种损伤的已发表报告表明是桡骨单独损伤，未累及尺骨。一项对8年期间所有病例的回顾性研究对这一假设提出了质疑，该研究表明每例病例中尺骨都存在可识别的损伤。描述了一种新的放射学征象——“尺骨弓形征”，以帮助正确识别这种损伤模式。如果在真正的侧位X线片上尺骨后缘偏离直线>0.01毫米，则应怀疑桡骨头脱位或半脱位。
