Article

Developing criteria for assessing patellofemoral kinematics is
crucial to understand, evaluate, and monitor patellofemoral function. The objective of this study was to assess a sequential 3D analysis method based on
biplanar radiographs, using an in vitro protocol.
HYPOTHESIS: Biplanar
radiography combined with novel 3D reconstruction methods provides a reliable
evaluation of patellofemoral function, without previous imaging. MATERIAL AND
METHODS: Eight cadaver specimens were studied during knee flexion cycles from 0
degrees to 60 degrees induced by an in vitro simulator. The protocol was
validated by investigating sequential and continuous motion using an
optoelectronic system, evaluating measurement accuracy and reproducibility using
metallic beads embedded in the patella, and comparing the 3D patellar geometry to
computed tomography (CT) images. RESULTS: The differences in position between the
sequential and continuous kinematic analyses were less than 1mm and 1 degrees .
The protocol proved reliable for tracking several components of knee movements,
including patellar translations, flexion, and tilt. In this analysis, uncertainty
was less than 2 mm for translations and less than 3 degrees for rotations, except
rotation in the coronal plane. For patellar tilt, uncertainty was 5 degrees .
Mean difference in geometry was 0.49 mm. DISCUSSION: Sequential analysis results
are consistent with continuous kinematics. This analysis method provides patellar
position parameters without requiring previous CT or magnetic resonance imaging.
A clinical study may deserve consideration to identify patellofemoral kinematic
profiles and position criteria in vivo. LEVEL OF EVIDENCE:
IV, experimental
study.
CI - Copyright (c) 2015 Elsevier Masson SAS. All rights reserved.

Langue : FRANCAIS