Posterior cruciate ligament: MR imaging

Area of Science:

• Orthopedic imaging
• Musculoskeletal radiology
• Knee joint anatomy

Background:

• Internal derangements of the knee are common, with the posterior cruciate ligament (PCL) being a key structure.
• Accurate diagnosis of PCL injuries is crucial for appropriate patient management.
• Traditional clinical examination may not always detect subtle or complex PCL injuries.

Purpose of the Study:

• To evaluate the diagnostic accuracy of magnetic resonance (MR) imaging for detecting posterior cruciate ligament (PCL) injuries.
• To compare MR findings with arthroscopic or arthrotomy results in patients with suspected knee derangements.

Main Methods:

• Retrospective review of 610 consecutive MR examinations of patients with suspected knee internal derangements.
• Detailed analysis of PCL visualization, signal intensity, and morphology on MR images.
• Correlation of MR findings with surgical confirmation (arthroscopy or arthrotomy) in 202 patients.

Main Results:

• MR imaging identified 11 PCL injuries (8 ligament disruptions, 3 avulsions) among 202 surgically evaluated patients, all confirmed intraoperatively.
• Characteristic MR findings of PCL injury included anatomic disruption, increased signal intensity, and ligament redundancy in avulsions.
• Four PCL injuries were detected by MR but missed during initial clinical assessment, highlighting MR's sensitivity.

Conclusions:

• Magnetic resonance (MR) imaging is a highly reliable and accurate method for diagnosing posterior cruciate ligament (PCL) injuries.
• MR imaging can detect PCL injuries that may be overlooked by clinical examination alone.
• Normal MR findings reliably exclude the presence of PCL abnormalities confirmed by surgery.