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Sensitivity of MRI for articular cartilage lesions of the patellae
V M Mattila1, M Weckström, V Leppänen
1Centre for Military Medicine, Lahti, Finland. Ville.Mattila@uta.fi
Background And Aims:
Reliable diagnosis of articular cartilage lesions of the patellae is often based on arthroscopy. However, unnecessary arthroscopies should be avoided. The aim of this study was to assess the sensitivity and applicability of MRI to diagnosing articular cartilage lesions of the patellae.
Materials And Methods:
We identified 74 consecutive males (mean age 21 years, range 18-28) from the medical records of our institute with the sole diagnosis of articular cartilage lesions of the patellae based on arthroscopy. Magnetic resonance imaging was performed with 1.0 Tesla scanner a mean of 4 weeks before arthroscopy. Sensitivity of symptoms, and MRI for the diagnosis was calculated.
Results:
Based on arthroscopy, 20 (27%) cases of cartilage lesions of the patellae were grade-I, 32 (43%) were grade-II, and 22 (30%) were grade-III. MRI revealed cartilage lesions of the patellae in 49 knees (66%), indicating that the sensitivity of MRI was 66% (95% CI: 53%-74%). MRI sensitivity increased with the severity of chondral lesions: all grade III to IV lesions were detected (sensitivity 100%, 95% CI: 85%-100%) by MRI. Grade of articular cartilage lesions of the patellae based on arthroscopy was not associated with clinical symptoms (p=0.61).
Conclusions:
The sensitivity of 1.0 Tesla MRI for detecting grade-I lesions was low and could not be used to confirm the diagnosis of articular cartilage lesions of the patellae. For the detection of more severe grade-II to III lesions, the MRI sensitivity was markedly higher. MRI may thus be considered an accurate diagnostic tool for identifying more severe cases of articular cartilage lesions of the patellae.
Insights
Magnetic resonance imaging (MRI) has limited sensitivity for detecting early-stage patellar cartilage lesions but is effective for more severe cases. This study assessed MRI
Area of Science:
- Orthopedic Surgery
- Radiology
- Medical Imaging
Background:
- Arthroscopy is the gold standard for diagnosing patellar articular cartilage lesions.
- Minimizing unnecessary arthroscopies is crucial for patient care.
- Accurate non-invasive diagnostic methods are needed.
Purpose of the Study:
- To evaluate the sensitivity and applicability of Magnetic Resonance Imaging (MRI) for diagnosing articular cartilage lesions of the patellae.
- To compare MRI diagnostic accuracy with arthroscopic findings.
- To determine if MRI can replace arthroscopy in certain cases.
Main Methods:
- A cohort of 74 male patients with arthroscopically confirmed patellar cartilage lesions was analyzed.
- 1.0 Tesla MRI scans were performed a mean of 4 weeks prior to arthroscopy.
- Sensitivity of MRI and clinical symptoms for diagnosis was calculated.
Main Results:
- Arthroscopy identified 20 grade-I, 32 grade-II, and 22 grade-III patellar cartilage lesions.
- MRI detected cartilage lesions in 66% of knees, with an overall sensitivity of 66%.
- MRI sensitivity was 100% for detecting severe grade-III lesions, but low for grade-I lesions. Clinical symptoms did not correlate with lesion grade.
Conclusions:
- 1.0 Tesla MRI has low sensitivity for detecting grade-I patellar cartilage lesions.
- MRI demonstrates markedly higher sensitivity for diagnosing more severe grade-II and III lesions.
- MRI can be considered an accurate tool for identifying more severe articular cartilage lesions of the patellae, potentially reducing the need for arthroscopy.
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