From the Departments of Nuclear Medicine.
Orthopedic Surgery.
Clin Nucl Med. 2022 Nov 1;47(11):e704-e705. doi: 10.1097/RLU.0000000000004312. Epub 2022 Jun 11.
Spontaneous osteonecrosis of the knee (SONK) is the most common phenotype of osteonecrosis of knee joints in older adults. Early diagnosis with appropriate management is crucial for improving the prognosis of the SONK. We present SONK in bone scintigraphy and SPECT/CT in 65-year-old man with sudden worsening knee pain and normal radiographs. SPECT/CT revealed intense uptake in subchondral area of left femoral medial condyle, which can be differed from progressed osteoarthritic change of the knee joints suspected on planar scintigraphy. Subsequently performed MRI showed characteristic finding of SONK. Total knee replacement arthroplasty was performed with final histological diagnosis of SONK.
膝关节自发性骨坏死（SONK）是老年人膝关节骨坏死最常见的表型。早期诊断和适当的治疗对于改善 SONK 的预后至关重要。我们介绍了一位 65 岁男性患者的 SONK 在骨闪烁显像和 SPECT/CT 的表现，该患者突发膝关节疼痛加重，且 X 线片正常。SPECT/CT 显示左侧股骨内侧髁软骨下区域摄取明显增加，这与平面闪烁显像上可疑的膝关节进展性骨关节炎改变不同。随后进行的 MRI 显示了 SONK 的特征性表现。患者接受了全膝关节置换术，最终的组织学诊断为 SONK。
