[Computerized tomography of the meniscus with a stress device]

Area of Science:

• Radiology
• Orthopedic Imaging
• Biomechanical Engineering

Background:

• Meniscal injuries are common, often diagnosed using imaging techniques.
• Conventional computed tomography (CT) can be limited by narrow articular rima, hindering accurate diagnosis.
• Assessing meniscal integrity under stress is crucial for understanding injury severity.

Purpose of the Study:

• To evaluate the efficacy of a mechanical stress device in conjunction with CT for meniscal assessment.
• To determine if the device improves articular rima widening for better visualization.
• To assess the diagnostic performance of stress-applied CT for meniscal injuries.

Main Methods:

• 284 patients with suspected meniscal injury were evaluated.
• CT scans were performed during forced varus and valgus maneuvers in 70 patients using a mechanical stress device.
• Image acquisition parameters included a 18 cm FOV, 140 kVp, 170 mA, 3s acquisition time, and 1.5 mm slice thickness.
• Arthroscopy was used as the gold standard to correlate radiological findings.

Main Results:

• Stress-applied CT demonstrated high diagnostic accuracy (97.1%), sensitivity (97.3%), and specificity (96.8%).
• For the medial meniscus, sensitivity reached 100% with 96% specificity and 98% accuracy.
• For the external meniscus, sensitivity was 88.9%, specificity 100%, and accuracy 94.7%.

Conclusions:

• CT utilizing a mechanical stress device is highly effective for defining meniscal pathology.
• The technique accurately visualizes the shape and complexity of meniscal tears, especially in challenging cases.
• This method improves diagnostic capabilities compared to conventional CT, particularly when the articular rima is narrow.