ACL Mucoid Degeneration vs Partial Tear: Key MRI Differences
ACL Mucoid Degeneration: The MRI Finding Every Radiologist Should Recognize Introduction A 56-year-old woman presented with persistent knee pain. She had no major history of trauma, no clinical instability, and no obvious signs suggesting acute ligament rupture. Yet her MRI revealed an abnormal anterior cruciate ligament (ACL). At first glance, the ligament appeared thickened and hyperintense. Many radiologists and clinicians might immediately consider a partial ACL tear. However, a closer inspection revealed one of the most commonly overlooked diagnoses in musculoskeletal MRI: Anterior Cruciate Ligament Mucoid Degeneration (ACLMD). Although relatively uncommon, ACL mucoid degeneration is increasingly recognized due to widespread MRI utilization. Failure to identify this entity can lead to misdiagnosis, unnecessary surgical intervention, and confusion during orthopedic consultation. As musculoskeletal MRI volumes continue to rise and artificial intelligence increasingly assists radiolo...