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The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome
Xiaokang Gao1,2, Jinwei Liu1,3, Jingyu Zhang3
1Clinical School/College of Orthopedics, Tianjin Medical University, 406 Jiefang South Road, Tianjin, 300211, China.
Journal of Orthopaedic Surgery and Research
|January 23, 2025
Summary
The new patellar compression angle (PCA) shows moderate diagnostic performance for lateral patellar compression syndrome (LPCS), offering a potential new method for diagnosing this common cause of anterior knee pain.
Area of Science:
- Orthopedic imaging
- Radiology
- Knee biomechanics
Background:
- Lateral patellar compression syndrome (LPCS) causes anterior knee pain.
- Current radiological methods for LPCS diagnosis lack accuracy.
- Improved diagnostic tools are needed for early LPCS detection.
Purpose of the Study:
- To establish a novel diagnostic imaging examination for LPCS.
- To evaluate the accuracy of the new examination against conventional methods.
Main Methods:
- Retrospective analysis of 72 LPCS patients and 140 controls (June 2020-May 2023).
- Utilized axial radiographs and knee MRI.
- Assessed patellar compression angle (PCA), tilting angle (TA), congruence angle (CA), Grelsamer angle (AG), and lateral patellofemoral angle (LPA).
Main Results:
- The patellar compression angle (PCA) demonstrated the highest diagnostic accuracy (ROC AUC 0.87).
- A PCA < 14.7° indicated LPCS with high sensitivity (80.6%) and specificity (82.9%).
- PCA showed good interobserver reproducibility (ICC 0.85).
Conclusions:
- The patellar compression angle (PCA) exhibits moderate diagnostic performance for LPCS.
- PCA may serve as a valuable new tool for diagnosing LPCS in clinical practice.
