1. Influence of lower limb rotation on hindfoot alignment using a conventional two-dimensional radiographic technique.
- Author
-
Baverel, L., Brilhault, J., Odri, G., Boissard, M., and Lintz, François
- Subjects
- *
RADIOGRAPHY , *T-test (Statistics) , *KNEE injuries , *SIMULATION methods & models , *MATHEMATICAL models , *LEG physiology , *ANKLE physiology , *ANKLE , *DEAD , *RANGE of motion of joints , *LEG , *THEORY , *PREDICTIVE tests ,RESEARCH evaluation - Abstract
Background: Rotation is one of the variables explaining lack of reproducibility in assessing hindfoot alignment. The hypothesis for this study was that a mathematical model predicts how this modifies radiographic hindfoot alignment measurements.Methods: A cadaveric lower limb, disjointed at knee level, was used. Sagittal and coronal planes were fixed using a custom clamp. Standard AP views were shot every five degrees and measured hindfoot alignments were compared to theoretical values obtained from a mathematical simulation.Results: Hindfoot angle was 7.04° at 0° rotation and 2.11° at -90°. Intra-class and inter-investigator correlation was 0.863. The t-test showed no significant difference (p=0.73). Intra-investigator correlation was 0.957. The R2 correlation index was 0.852.Conclusions: The mathematical model accurately predicted the variations of the hindfoot angle which was maximum when the foot was aligned with the X-rays source. It then decreased when the foot rotated away, following a parabolic curve. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF