Case ReportsPainful Fibrous Nonunion of a Posterior Oblique Ligament Bony Avulsion Fracture Associated With Anterior Cruciate Ligament Tear A Case ReportSmith, John-Rudolph H. BS1; Dittman, Lauren E. MD2; Camp, Christopher L. MD2; Levy, Bruce A. MD2,a Author Information 1Mayo Clinic Alix School of Medicine, Rochester, Minnesota 2Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota aE-mail address for B.A. Levy: [email protected] Investigation performed at Mayo Clinic, Rochester, MN Disclosure: The Disclosure of Potential Conflicts of Interest forms are provided with the online version of the article (https://links.lww.com/JBJSCC/B996). JBJS Case Connector 12(4):e22.00547, October-December 2022. | DOI: 10.2106/JBJS.CC.22.00547 Buy Metrics Abstract Case: This report describes a case of a posterior oblique ligament (POL) bony avulsion fracture associated with an anterior cruciate ligament (ACL) tear in a 16-year-old female gymnast. The avulsion fracture was discovered on repeat radiographs and magnetic resonance imaging after the patient developed increased pain after ACL reconstruction. After excising the bony avulsion and repairing the POL, she reported complete resolution of her preoperative pain. Conclusion: Bony avulsion fractures of the POL are rare and challenging to diagnose. Awareness of this injury and the subtle imaging findings will help clinicians appropriately diagnose and treat these lesions. Copyright © 2022 by The Journal of Bone and Joint Surgery, Incorporated