The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome
Abstract Background Lateral patellar compression syndrome (LPCS) is a common cause of anterior knee pain. Early diagnosis of LPCS using an accurate radiological examination is, therefore, important. However, the currently used radiological examinations for detecting LPCS are poor diagnostic indicato...
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BMC
2025-01-01
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| Series: | Journal of Orthopaedic Surgery and Research |
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| Online Access: | https://doi.org/10.1186/s13018-025-05501-z |
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| author | Xiaokang Gao Jinwei Liu Jingyu Zhang Zhitao Xie Chengyue Yu Yufei Yuan Leming Mou Weiguo Xu |
| author_facet | Xiaokang Gao Jinwei Liu Jingyu Zhang Zhitao Xie Chengyue Yu Yufei Yuan Leming Mou Weiguo Xu |
| author_sort | Xiaokang Gao |
| collection | DOAJ |
| description | Abstract Background Lateral patellar compression syndrome (LPCS) is a common cause of anterior knee pain. Early diagnosis of LPCS using an accurate radiological examination is, therefore, important. However, the currently used radiological examinations for detecting LPCS are poor diagnostic indicators. Therefore, the aim of this study was to establish a new diagnostic imaging examination for LPCS and evaluate its accuracy in comparison with conventional examinations. Methods From June 2020 to May 2023, a retrospective analysis was conducted on 72 patients in the LPCS group and 140 patients in the Control group, all of whom underwent axial radiographs of the patella and knee MRI. The patellar compression angle (PCA), Tilting angle (TA), Congruence angle (CA), Grelsamer angle (AG), and Lateral patellofemoral angle (LPA) were used and compared statistically for their accuracy in terms of diagnosing LPCS. Results The area under the receiver operating characteristic curve (ROC) for the PCA was 0.87, which was the highest among the five examinations. ROC analysis revealed that a smaller PCA, less than 14.7°, was associated with LPCS, with the highest sensitivity (80.6%), specificity (82.9%), accuracy (82.1%), positive predictive value (PPV, 70.7%), negative predictive value (NPV, 89.2%), positive likelihood ratio (PLR, 4.71), and lowest negative likelihood ratio (NLR, 0.23) compared with the other four examinations. The interobserver reproducibility of the PCA was good, with an intraclass correlation coefficients (ICCs) of 0.85. Conclusions The PCA can detect LPCS with a moderate diagnostic performance and could, therefore, might be a new angle for the diagnosis of LPCS in clinical settings. |
| format | Article |
| id | doaj-art-c8bf9490425347789e2d7a2b37950d17 |
| institution | Kabale University |
| issn | 1749-799X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Orthopaedic Surgery and Research |
| spelling | doaj-art-c8bf9490425347789e2d7a2b37950d172025-01-26T12:43:27ZengBMCJournal of Orthopaedic Surgery and Research1749-799X2025-01-012011910.1186/s13018-025-05501-zThe patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndromeXiaokang Gao0Jinwei Liu1Jingyu Zhang2Zhitao Xie3Chengyue Yu4Yufei Yuan5Leming Mou6Weiguo Xu7Clinical School/College of Orthopedics, Tianjin Medical UniversityClinical School/College of Orthopedics, Tianjin Medical UniversityTianjin HospitalDepartment of Orthopedics Surgery, Affiliated Hospital of Hebei Engineering UniversityTianjin Hospital, Tianjin UniversityThe fifth Orthopedics Department of Handan Central HospitalWeifang People’s HospitalClinical School/College of Orthopedics, Tianjin Medical UniversityAbstract Background Lateral patellar compression syndrome (LPCS) is a common cause of anterior knee pain. Early diagnosis of LPCS using an accurate radiological examination is, therefore, important. However, the currently used radiological examinations for detecting LPCS are poor diagnostic indicators. Therefore, the aim of this study was to establish a new diagnostic imaging examination for LPCS and evaluate its accuracy in comparison with conventional examinations. Methods From June 2020 to May 2023, a retrospective analysis was conducted on 72 patients in the LPCS group and 140 patients in the Control group, all of whom underwent axial radiographs of the patella and knee MRI. The patellar compression angle (PCA), Tilting angle (TA), Congruence angle (CA), Grelsamer angle (AG), and Lateral patellofemoral angle (LPA) were used and compared statistically for their accuracy in terms of diagnosing LPCS. Results The area under the receiver operating characteristic curve (ROC) for the PCA was 0.87, which was the highest among the five examinations. ROC analysis revealed that a smaller PCA, less than 14.7°, was associated with LPCS, with the highest sensitivity (80.6%), specificity (82.9%), accuracy (82.1%), positive predictive value (PPV, 70.7%), negative predictive value (NPV, 89.2%), positive likelihood ratio (PLR, 4.71), and lowest negative likelihood ratio (NLR, 0.23) compared with the other four examinations. The interobserver reproducibility of the PCA was good, with an intraclass correlation coefficients (ICCs) of 0.85. Conclusions The PCA can detect LPCS with a moderate diagnostic performance and could, therefore, might be a new angle for the diagnosis of LPCS in clinical settings.https://doi.org/10.1186/s13018-025-05501-zPatellar compression angleLateral patellar compression syndromeAxial radiographPatella |
| spellingShingle | Xiaokang Gao Jinwei Liu Jingyu Zhang Zhitao Xie Chengyue Yu Yufei Yuan Leming Mou Weiguo Xu The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome Journal of Orthopaedic Surgery and Research Patellar compression angle Lateral patellar compression syndrome Axial radiograph Patella |
| title | The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome |
| title_full | The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome |
| title_fullStr | The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome |
| title_full_unstemmed | The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome |
| title_short | The patellar compression angle: a new, accurate diagnostic angle for lateral patellar compression syndrome |
| title_sort | patellar compression angle a new accurate diagnostic angle for lateral patellar compression syndrome |
| topic | Patellar compression angle Lateral patellar compression syndrome Axial radiograph Patella |
| url | https://doi.org/10.1186/s13018-025-05501-z |
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