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Updated: Dec 31, 2025

Anterior Cruciate Ligament Transection and Synovial Fluid Lavage in a Rodent Model to Study Joint Inflammation and Posttraumatic Osteoarthritis

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Different Patellar Indices and Their Role in Decision-Making: An MRI-Based Study.

Sivashanmugam Raju¹, Karthikeyan Chinnakkannu^2,3, Balasubramanian Balakumar⁴

¹Department of Orthopedics, St. Louis University School of Medicine, St. Louis, Missouri.

The Journal of Knee Surgery

|January 9, 2020

Summary

This summary is machine-generated.

This study determined normal knee patellar indices using MRI, finding that patellar position should not be the sole factor in surgical decisions for patellofemoral pain. Different indices showed varying correlations and agreements.

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Area of Science:

Orthopedics
Radiology
Biomedical Engineering

Background:

Knee MRI is crucial for evaluating patellofemoral pain.
Surgical decisions for patellofemoral pain can benefit from standardized imaging metrics.
Assessing normal patellar indices is key to understanding patellofemoral alignment.

Purpose of the Study:

To establish normal ranges for patellar indices from knee MRI.
To analyze correlations and agreements between different patellar indices.
To compare these indices across diverse ethnic populations.

Main Methods:

Prospective analysis of 117 knee MR images.
Calculation of Insall-Salvati (IS), modified IS, patellotrochlear (PT), and patellophyseal (PP) indices.
Statistical analysis including Cohen's kappa and Pearson's correlation.

Main Results:

Mean values: IS=1.00, modified IS=1.53, PT=0.40, PP=0.58.
Strong negative correlation and good agreement observed between PT and PP indices.
4% of asymptomatic patients fell outside standardized cut-off values, with varying classifications by different indices.

Conclusions:

Patellar position is one of many factors in surgical decisions for patellofemoral pain.
Existing patellar indices show limited correlation, except for PT and PP.
Further research is needed to clarify the clinical utility of these indices in surgical planning.