Outline the radiographicanatomy and alignment of the foot.
Demonstrate the common congenital abnormalities of the foot and their imaging correlates.
ANATOMY OF THE FOOT
The anatomy of the foot is complex.
The foot can be broadly divided into three main parts:
The most posterior portion of the foot,
comprised of thetalus and calcaneus.
This includes the ankle joint (tibiotalar) and subtalar joint (which has three facets: anterior,
middle and posterior)
The hindfootis joined to the midfoot via the Chopart joint (mid tarsal joint)
This lies between the hindfoot and forefoot and containsthe navicular,
cuboid and cuneiforms.
It is joined to the forefoot via...
Imaging findings OR Procedure Details
CONGENITAL TARSAL COALITION
This is the abnormal fusion of two or more tarsal bones,
which most likely results from abnormal differentiation and segmentation of primitive mesenchyme with resultant lack of joint formation.
The estimated prevalence is less than 1% of the population.
50% of cases are bilateral.
90% of coalitions are talocalcaneal or calcaneonavicular.
In talocalcaneal coalition all three facets of the subtalar joint may be affected,
however the middle facet is the most commonly involved.
The coalition is most commonly intra-articular,
There are several congenital abnormalities of the foot,
ranging from common to rare.
These may be asymptomatic or may predispose to pain and abnormalities in the alignment of the foot and ankle.
Radiographic assessment of pediatric foot alignment: review.
AJR 2010 194:51-58.
Congenital tarsal coalition: multimodality evaluation with emphasis on CT and MR imaging.
Radiographics 2000 20:2,
Tarsal coalitions: radiographic,
CT and MR imaging findings.
HSS J 2014 10(2): 153-166.
The symptomatic accessory navicular bone: a report and discussion of the clinical presentation.
Curr Probl Diagn Radiol 2005...
Dr Asif Saifuddin,
Royal National Orthopaedic Hospital