Adams Nicholas C, Alonge Robin L, Edmonds Lance D
Department of Radiology, David Grant Medical Center, Fairfield, California, United States.
J Clin Imaging Sci. 2022 Aug 22;12:51. doi: 10.25259/JCIS_33_2022. eCollection 2022.
Disuse osteopenia (DO) is a disorder due to reduced weight-bearing often following immobilization injuries. It is most commonly observed in the ankles and knees and is believed to be due primarily to increased bone reabsorption associated with disuse. Both traditional radiography and magnetic resonance (MR) imaging are useful in identifying abnormalities associated with DO. Specifically, linear subchondral osteopenia has been given the term "Hawkins sign" when seen in the talus, but this finding may also be seen elsewhere. When present, it not only is an indication of DO but also indicates the presence of sufficient vascular flow, and the unlikely development of avascular necrosis. We report a case of Hawkins sign of the knee demonstrated on radiography and MR and demonstrate the clinical importance of recognizing this sign, outside its usual setting, in assessing the prognosis of a healing fracture.
废用性骨质减少（DO）是一种因负重减少导致的病症，常见于固定伤之后。它最常出现在踝关节和膝关节，被认为主要是由于废用相关的骨吸收增加所致。传统X线摄影和磁共振（MR）成像在识别与DO相关的异常方面都很有用。具体而言，当在距骨中看到线性软骨下骨质减少时，被称为“霍金斯征”，但这一发现也可能出现在其他部位。当出现时，它不仅是DO的一个指标，还表明有足够的血流，且不太可能发生缺血性坏死。我们报告一例通过X线摄影和MR显示的膝关节霍金斯征病例，并展示了在评估愈合骨折预后时，在其通常出现部位以外识别该征象的临床重要性。
