Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, California, USA.
Orthop J Sports Med. 2015 Mar 24;3(3):2325967115576120. doi: 10.1177/2325967115576120. eCollection 2015 Mar.
Anterior cruciate ligament (ACL) reconstruction is performed commonly, with a low risk of complication. Osteonecrosis of the knee is a potentially devastating condition and has been observed both spontaneously and after meniscectomy, although osteonecrosis has not been described as a complication after ACL reconstruction.
To describe the development of osteonecrosis of the knee in 5 patients after arthroscopic ACL reconstruction.
Case series; Level of evidence, 4.
This study involved 5 patients (mean age, 33.2 years) who developed osteonecrosis of the knee after ACL reconstruction. A retrospective chart review was performed to identify clinical characteristics and surgical factors present in each of the 5 cases.
In 4 cases, the pathologic changes were present in both the medial and lateral femoral condyles, with isolated lateral condyle changes in the other case. The mean time to diagnosis was 11.6 months. These patients underwent an average of 1.8 additional surgical procedures after the diagnosis of osteonecrosis.
Osteonecrosis of the knee is a rare outcome after ACL reconstruction. We are unable to identify clear risk factors for the development of this complication, although we hope the presentation of these cases will help promote the identification of other cases in future studies.
前交叉韧带（ACL）重建术较为常见，并发症风险较低。膝关节骨坏死是一种潜在的破坏性疾病，既可以自发发生，也可以在半月板切除术后发生，尽管 ACL 重建术后并未描述为并发症。
描述 5 例关节镜 ACL 重建术后膝关节骨坏死的发生情况。
病例系列；证据水平，4 级。
本研究纳入了 5 例（平均年龄 33.2 岁）ACL 重建后发生膝关节骨坏死的患者。对临床特征和 5 例患者的手术因素进行回顾性图表分析。
4 例患者的病变同时累及股骨内、外侧髁，另 1 例仅累及外侧髁。诊断平均时间为 11.6 个月。这些患者在诊断为骨坏死后平均接受了 1.8 次额外的手术治疗。
ACL 重建术后膝关节骨坏死较为罕见。我们无法确定这种并发症发生的明确危险因素，但希望这些病例的介绍将有助于在未来的研究中发现其他病例。
