Department of Orthopedics Surgery, Mackay Memorial Hospital, Taipei City, Taiwan.
Mackay Junior College of Medicine, Nursing and Management, New Taipei City, Taiwan.
Biomed Res Int. 2021 Apr 30;2021:6614122. doi: 10.1155/2021/6614122. eCollection 2021.
Spontaneous osteonecrosis of the knee (SONK) can lead to severe knee osteoarthritis predominantly localized to the medial compartment. We aimed to determine whether unicompartmental knee arthroplasty was an effective treatment for primary SONK.
We analyzed the functional outcomes in 23 patients with SONK (with a magnetic resonance imaging- (MRI-) confirmed diagnosis) who underwent UKA at a single center. The mean follow-up time was 67 months post-UKA.
Significant improvements in function were indicated by reduced Oxford Knee and Visual Analogue Scale scores after UKA, and there were no specific complications after the procedures. The incidence of MRI-identified medial meniscus posterior root tear (MMPRT) was 69.6% (16/23).
Unicompartmental arthroplasty for SONK is less destructive to the native knee structure than total knee arthroplasty but can achieve comparable prognosis with strict patient selection. While the precise etiology of SONK is unknown, one theory posits that a MMPRT may change the biomechanical circumstances of the knee joint, leading to osteonecrosis. Although not confirmatory, the high prevalence rate suggests that MMPRT may have a key role in the development of SONK. UKA is an effective treatment option for SONK, resulting in significant functional improvement. Long-term (>10 years) outcomes should be investigated.
膝关节自发性骨坏死（SONK）可导致严重的膝关节骨关节炎，主要局限于内侧间室。我们旨在确定单髁膝关节置换术是否是治疗原发性 SONK 的有效方法。
我们分析了单中心 23 例 SONK 患者（经 MRI 证实诊断）行 UKA 的功能结果。UKA 后平均随访时间为 67 个月。
UKA 后，Oxford 膝关节评分和视觉模拟评分均显著改善，且术后无特殊并发症。MRI 确定的内侧半月板后根撕裂（MMPRT）的发生率为 69.6%（16/23）。
与全膝关节置换术相比，单髁关节置换术对膝关节的原生结构破坏较小，但在严格的患者选择下可达到相似的预后。虽然确切的 SONK 病因尚不清楚，但有一种理论认为 MMPRT 可能改变膝关节的生物力学环境，导致骨坏死。虽然没有证实，但高患病率表明 MMPRT 可能在 SONK 的发展中起关键作用。UKA 是 SONK 的有效治疗选择，可显著改善功能。应调查长期（>10 年）结果。
