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A clinical composite score accurately detects meniscal pathology
Douglas J Lowery1, Timothy D Farley, David W Wing
1Orthopaedic Associates, Evansville, Indiana, USA.
Summary
A composite score of five common knee tests accurately diagnoses meniscal tears. However, accuracy is reduced by anterior cruciate ligament (ACL) injuries but improved by degenerative joint disease (DJD).
Area of Science:
- Orthopedic Surgery
- Sports Medicine
- Diagnostic Imaging
Background:
- Meniscal tears are common knee injuries.
- Accurate diagnosis is crucial for effective treatment.
- Diagnostic challenges arise with coexisting knee pathologies.
Purpose of the Study:
- To evaluate the diagnostic efficacy of a composite score of five common clinical tests for meniscal tears.
- To assess the impact of anterior cruciate ligament (ACL) injury and degenerative joint disease (DJD) on the diagnostic accuracy of this composite score.
Main Methods:
- Prospective data collection from patients with primary knee complaints.
- Inclusion of five key clinical variables: history of catching/locking, pain with hyperextension, pain with maximum flexion, McMurray's maneuver findings, and joint line tenderness.
- Correlation of composite examination findings with arthroscopically confirmed meniscal pathology.
Main Results:
- A significant relationship was found between the number of positive diagnostic tests and the presence of meniscal tears (P = .001).
- A composite score of five positive findings yielded a 92.3% positive predictive value (PPV) for meniscal tears.
- PPV remained above 75% with at least three positive findings in the absence of ACL/DJD.
- ACL injury decreased PPV to 67%, while DJD increased PPV to 100%.
Conclusions:
- The five-test composite examination is a valuable tool for diagnosing meniscal tears, with a 92.3% PPV when all tests are positive.
- Concomitant ACL injury reduces diagnostic accuracy, potentially leading to false positives.
- DJD can increase diagnostic predictability but may also contribute to false negatives.
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