POSITIVE PREDICTIVE VALUE OF RADIOLOGICAL KNEE EFFUSION SIZE IN TRAUMATIC KNEE INJURY IN PREDICTING INTERNAL DERANGEMENT TAKING MAGNETIC RESONANCE IMAGING AS GOLD STANDARD".
Main Article Content
Keywords
Knee trauma, Internal knee injuries, Knee effusion, Positive predictive value, Pediatric trauma, MRI
Abstract
Objective: This study sought to investigate whether the size of knee effusion visible on X-rays can effectively predict internal knee injuries in children with trauma, using MRI as the reference standard for diagnosis.
Methods: A cross-sectional study was performed at the Department of Diagnostic Radiology in Children’s Hospital Lahore from October 29, 2019, to April 28, 2020. The sample included 101 children, aged 4 to 12 years, of both genders, who presented after knee trauma with suspected internal knee injuries indicated by knee effusion (≥1 cm in anteroposterior diameter on lateral X-ray). The diagnosis was confirmed through MRI, which served as the gold standard. Each X-ray was evaluated for knee effusion, categorizing the findings as true positive or false positive. Informed consent was obtained from the parents of all participating children.
Results: The average age of the participants was 8.6 years, with a standard deviation of 2.4 years. Among the participants, 73 (72.3%) were boys and 28 (27.7%) were girls, resulting in a male-to-female ratio of 2.6:1. Internal knee injuries were confirmed in 93 children (92.1%) via MRI. The study revealed a positive predictive value of 92.1% for knee effusion detected on X-rays in predicting internal knee injuries, a value that was consistent across various subgroups based on age, gender, and weight.
Conclusion: The findings indicate that knee effusion size on X-rays holds a high positive predictive value (92.1%) for identifying internal knee injuries in pediatric trauma cases, as confirmed by MRI. The advantages of X-rays—being quick, non-invasive, cost-effective, and widely available—support their use in assessing children with knee injuries in clinical practice.
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Dr. Ayesha Khalid
Senior Registrar Radiology, The University of Lahore Teaching Hospital,
Email: ashookq@yahoo.com, Ph. No. 0320-8856894
Dr. Faiza Farooq
HOD Radiology, The University of Lahore Teaching Hospital,
Email: faiza.farooq@ucm.uol.edu.pk, Ph. No. 0321-4026126
Dr. Khadija Ashraf
Senior Registrar Radiology, The University of Lahore Teaching Hospital,
Email: khadijaashraf891@gmail.com,
Dr. Hamna Ashraf
Senior Registrar Radiology, The University of Lahore Teaching Hospital,
Email: hamna.ashraf@ucm.uol.edu.pk, Ph. No. 0336-4239157
Lala Rukh
Senior Registrar, Doctor's Hospital Medical Centre, Lahore. Email: drlalarulh02@gmail.com
Amara Arshad
Senior Registrar, Email: ammara.arshad248@gmail.com