New MRI Measurement of Patellar Height in Knee Extension - IES-EV Control Study - Trial NCT05659316

Timeline & Enrollment

Primary Outcome

Index of sagittal engagement of the patella (IES)

Summary

The measurement of the patellar height is essential to decide and quantify the surgical
 correction to be made. The classic index is that of Cato and Deschamps. It has the advantage
 of its simplicity, with the measurement on a simple profile radiograph of the ratio between
 the distance from the patella to the tibia and the length of the patella. However, it has the
 disadvantage of measuring this height in relation to the tibia when the dislocation is
 located at the level of the patello-trochlear joint. The MRI index of sagittal patellar
 engagement on the trochlea (IES), described in 2012, does not have this drawback but it does
 not appear to be reliable: its value depends, in fact, on the flexion of the knee. This
 flexion, required by the MRI, is variable and is not specified by the radiologist. It is due
 to the use of an antenna that surrounds and lifts the knee.
 
 The hypothesis of the study is that it is possible to determine and validate a new IES, in
 knee extension and therefore reproducible, thanks to the measurement of knee flexion on MRI.
 The precise value of this flexion can allow a virtual correction of the original IES to
 obtain, by mathematical calculation, the new IES in virtual extension.

ICD-10 Classifications