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Foot Ankle Surg. 2017 Mar;23(1):44-49. doi: 10.1016/j.fas.2016.02.003. Epub 2016 Mar 30.

Influence of lower limb rotation on hindfoot alignment using a conventional two-dimensional radiographic technique.

Author information

1
CHU de Nantes, 1 place Alexis Ricordeau, Nantes, France.
2
CHRU de Tours, 37044 Tours, France.
3
Avicenne University Hospital, 125 rue de Stalingrad, 93000 Bobigny, France.
4
Ankle and Foot Surgery Centre, Clinique de l'Union, 31240 Saint Jean, France. Electronic address: francois.lintz@clinique-union.fr.

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.

KEYWORDS:

Alignment; Foot; Forefoot; Hindfoot; Meary; Radiography

PMID:
28159042
DOI:
10.1016/j.fas.2016.02.003
[Indexed for MEDLINE]

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