ArticlePediatric radiology2022
A comparison of sagittal MRI and lateral radiography in determining the Insall-Salvati ratio and diagnosing patella alta in the pediatric knee.
Article in Pediatric radiology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 13 citations in OpenAlex.
- Beyond linear measurements: a comprehensive 3D CT analysis of patellar volume and density.Surgical and radiologic anatomy : SRA · 2026Article
- Increased sagittal patellar height and reduced trochlear engagement on MRI are associated with recurrent patellar instability in skeletally immature knees: A comparative study.Journal of experimental orthopaedics · 2026Article
- Automatic measurement of Caton index on knee X-ray images using a key point detection model.European journal of radiology open · 2025Article
- Arthroscopic Management of Patellar Instability in Skeletally Immature Patients: Current Concepts and Future Directions.Journal of clinical medicine · 2025Review
- Abnormal patella height may be an independent risk factor in meniscal tears: a retrospective study in paediatric patients.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2024Article
- Reliability and modality analysis of patellar height measurement in pediatric knee.Frontiers in pediatrics · 2024Article
- Home ownership, full-time employment, and other markers of higher socioeconomic status are predictive of shorter time to initial evaluation, shorter time to surgery, and superior postoperative outcomes among lateral patellar instability patients undergoing medial patellofemoral ligament reconstruction.Knee surgery & related research · 2023Article
- Patellar Tracking: An Old Problem with New Insights.Radiographics : a review publication of the Radiological Society of North America, Inc · 2023Article
- Morphometric Parameters and MRI Morphological Changes of the Knee and Patella in Physically Active Adolescents.Medicina (Kaunas, Lithuania) · 2023Article
- Radiographic Evaluation of Pediatric Patients with Patellofemoral Instability.Current reviews in musculoskeletal medicine · 2022Review
- Evaluation of age group and sex differences in the measurement of patellar height of pediatric knee in a Korean population.Frontiers in pediatrics · 2022Article
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe Insall-Salvati ratio is a technique for determining patellar height that relies on bony landmarks. Magnetic resonance imaging (MRI) and plain radiography are used interchangeably to assess the Insall-Salvati ratio in the pediatric population despite the lack of validity in the literature.
objectiveThe purpose of this study was to investigate if the Insall-Salvati ratio and patella alta as determined on MRI are comparable to those determined on radiography in pediatric patients. MATERIALS AND
methodsWe conducted a retrospective review of 49 pediatric patients (age range: 7.5-17.0 years) with unfused growth plates who underwent both knee MRI and lateral knee radiography. Measurements for calculating the Insall-Salvati ratio (the ratio of patella tendon length to patella length) were obtained by three observers. Data were analyzed using paired t-tests and Pearson's correlation. A reliability assessment and inter-method agreements were performed. Patella alta was defined as an Insall-Salvati ratio > 1.2. Additional cutoffs of Insall-Salvati ratios > 1.3 and > 1.4 were also analyzed.
resultsThere was no statistically significant difference between Insall-Salvati ratio as determined on MRI (mean: 1.20) and radiographs (mean: 1.25; P > 0.05). There was a strong correlation between Insall-Salvati ratio as determined on MRI and radiographs (Pearson's r = 0.6) with moderate consistency (Cronbach's alpha = 0.78). There was a good level of agreement between the diagnosis of patella alta on MRI and radiographs when defined as an Insall-Salvati ratio greater than 1.2 and 1.3 (Cohen's kappa = 0.61).
conclusionThe results demonstrate a strong association between Insall-Salvati ratio and patella alta derived from MRI and radiographs in children ages 7.5 years and older.
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