Department of Orthopaedics and Traumatology; Inselspital Bern, University Hospital, Bern, Switzerland.
Orthopaedic Biomechanics Laboratory, Congress Medical Foundation, Pasadena, CA, USA.
J Hand Surg Eur Vol. 2022 Oct;47(9):944-951. doi: 10.1177/17531934221088508. Epub 2022 Mar 31.
Clinical studies suggest that even untreated basal ulnar styloid fractures may not affect patient outcomes. This may be due to the remaining parts of the distal radioulnar ligament still attached providing sufficient residual stability of the distal radioulnar joint. We tested this hypothesis in a biomechanical cadaveric model. Dorsopalmar translation of the distal radioulnar joint and forearm rotation were measured. Seventeen specimens were tested after a simulated ulnar styloid fracture including the fovea, followed by transection of the remaining palmar ( = 9) or dorsal ( = 8) portions of the distal radioulnar ligament and finally with all remnants transected. Rotation and translation both increased significantly after the final transection compared with the foveal fracture. The increase in translation was larger after transection of the dorsal remnants. We conclude that in an ulnar styloid fracture including the fovea, some ligament components are still attached to the ulnar head, giving residual stability to the distal radioulnar joint.
临床研究表明，即使未治疗的尺骨茎突基底部骨折也可能不会影响患者的预后。这可能是由于附着的远端尺桡侧韧带的其余部分仍提供了足够的远端桡尺关节残余稳定性。我们在生物力学尸体模型中对此假设进行了测试。测量了远端桡尺关节的背侧和掌侧平移以及前臂旋转。在模拟尺骨茎突骨折（包括窝）后测试了 17 个标本，随后横断掌侧（ = 9）或背侧（ = 8）的远端尺桡侧韧带的剩余部分，最后完全切断所有残端。与窝骨折相比，最后一次横断后旋转和平移均显著增加。背侧残端横断后，平移增加更大。我们得出结论，在包括窝的尺骨茎突骨折中，一些韧带成分仍附着于尺骨头部，为远端桡尺关节提供残余稳定性。
