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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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The evaluation of patellar height: a simple method.

Oliver Portner¹, Hossein Pakzad

¹Division of Orthopaedics, University of Ottawa Faculty of Medicine, Ottawa, ON, Canada. portgar@rogers.com

The Journal of Bone and Joint Surgery. American Volume

|January 7, 2011

Summary

This summary is machine-generated.

A new plateau-patella angle measurement offers a simpler, reliable method for assessing patellar height on knee radiographs. This angle correlates well with traditional indices, making it a valid alternative for clinical evaluation.

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Area of Science:

Orthopedics
Radiology
Medical Imaging Analysis

Background:

Patellar height is commonly assessed using ratios derived from lateral knee radiographs.
Existing methods like the Insall-Salvati index are popular but cumbersome, requiring multiple measurements and calculations.
A simpler, single angular measurement, the plateau-patella angle, was developed as an alternative.

Purpose of the Study:

To introduce the novel plateau-patella angle measurement for evaluating patellar height.
To validate the plateau-patella angle by comparing its accuracy and reliability against three established patellar height indices.

Main Methods:

Lateral knee radiographs from 269 patients were analyzed.
Measurements for the Insall-Salvati, Blackburne-Peel, and Caton-Deschamps indices, along with the plateau-patella angle, were recorded.
The new method's correlation with existing indices and its interobserver/intraobserver reliability were assessed.

Main Results:

The plateau-patella angle demonstrated excellent correlation with the evaluated traditional indices, particularly the Blackburne-Peel index.
High interobserver and intraobserver reliability were observed for the plateau-patella angle.
The mean plateau-patella angle was 25°, with 90% of measurements falling between 20° and 30°.

Conclusions:

The plateau-patella angle is a valid, rapid, and easily reproducible method for assessing patellar height.
It offers a simpler alternative to traditional ratio-based measurements.
Reliable and well-correlated with established techniques, it is suitable for clinical use.