MR imaging of cyclops lesions

Area of Science:

• Orthopedic surgery
• Radiology
• Sports medicine

Background:

• Localized anterior fibrosis, known as a cyclops lesion, frequently causes persistent knee extension loss following anterior cruciate ligament (ACL) reconstruction.
• Accurate diagnosis of cyclops lesions is crucial for effective management and patient recovery.

Purpose of the Study:

• To evaluate the diagnostic utility of magnetic resonance (MR) imaging in identifying cyclops lesions in patients experiencing extension loss after ACL reconstruction.
• To establish MR imaging as a noninvasive method for diagnosing cyclops lesions.

Main Methods:

• Retrospective review of 33 MR studies from 31 patients with persistent extension loss post-ACL reconstruction using patellar tendon autograft.
• Detailed MR imaging analysis including graft characteristics, tunnel placement, notch dimensions, and cyclops lesion detection.
• Correlation of preoperative MR findings with intraoperative arthroscopic results.

Main Results:

• MR imaging demonstrated a sensitivity of 85.0%, specificity of 84.6%, and accuracy of 84.8% in detecting cyclops lesions.
• No significant difference in intercondylar notch dimensions was observed between patients with and without cyclops lesions.
• MR imaging effectively characterized the signal intensity, location, and size of identified cyclops lesions.

Conclusions:

• MR imaging is a sensitive, specific, and accurate noninvasive diagnostic tool for identifying cyclops lesions.
• This imaging modality is valuable for patients with residual extension loss after ACL reconstruction, aiding in diagnosis and treatment planning.