Automated detection and segmentation of chondromalacia patella on axial knee MRI using YOLOv11 and a custom CNN: a deep learning-based diagnostic model.
Authors
Affiliations (4)
Affiliations (4)
- Department of Orthopaedic and Traumatology, İstanbul Medipol University Bahçelievler Hospital, İstanbul, Turkey. [email protected].
- Department of Radiology, Çam and Sakura City Hospital, İstanbul, Turkey.
- Department of Orthopaedic and Traumatology, Medicana International Ankara Hospital, Ankara, Turkey.
- İstanbul Medipol University International School of Medicine, İstanbul, Turkey.
Abstract
To evaluate a deep learning pipeline using YOLOv11 for segmentation and a custom CNN for classification to automatically detect and assess chondromalacia patella on axial knee MRI, aligning with expert clinical evaluation. A dataset of 650 axial knee MRIs was analyzed. YOLOv11 segmented the patellofemoral region, and a custom CNN classified chondromalacia. Performance was assessed using segmentation accuracy, classification accuracy, confidence scoring, and Grad-CAM-based visual explainability. The CNN achieved a test accuracy of 82.30% on 113 images, with an AUC of 0.87, indicating promising but preliminary discriminative ability. Grad-CAM maps showed reasonable agreement with expert interpretation. The proposed YOLOv11-CNN pipeline demonstrated promising accuracy and may provide a potentially useful and interpretable solution for the detection and segmentation of chondromalacia patella on MRI, with the possibility of enhancing efficiency and consistency in orthopedic radiology workflows after further validation. The online version contains supplementary material available at 10.1186/s12891-025-09275-7.