Imaging the Postoperative Knee Meniscus: An Evidence-Based Review

Area of Science:

• Orthopedic imaging
• Radiology
• Knee surgery outcomes

Background:

• Recurrent knee pain is a common complication following meniscus surgery.
• Accurate diagnosis of recurrent meniscus tears is crucial for effective patient management.
• Several imaging modalities are available for postoperative knee evaluation.

Purpose of the Study:

• To review the current evidence for various imaging techniques in diagnosing recurrent meniscus tears.
• To compare the efficacy of unenhanced MRI, indirect MR arthrography, direct MR arthrography, and CT arthrography.

Main Methods:

• Literature review of studies evaluating imaging for postoperative meniscus assessment.
• Analysis of evidence supporting the use of different arthrographic and MRI techniques.
• Focus on patients with suspected recurrent meniscus tears after surgery.

Main Results:

• Direct and indirect MR arthrography demonstrate higher diagnostic accuracy than conventional MRI.
• These techniques are particularly effective for assessing partial meniscectomies (>25% meniscus) and meniscus repairs.
• CT arthrography also plays a role in specific clinical scenarios.

Conclusions:

• Direct and indirect MR arthrography are superior to conventional MRI for evaluating the postoperative meniscus.
• These advanced MR techniques are recommended for patients with suspected recurrent meniscus tears after surgery.
• Imaging choice depends on clinical suspicion and extent of prior meniscal surgery.