The hindfoot goniometer is a small, simple and intuitive tool designed to measure the alignment of the baby’s hind foot, but also useful in adults. As such it is useful both to the clinician, orthopedist, physiatrist, physiotherapist, and to the technician called to produce any corrections.
It consists of a plexiglass polygon bearing a staircase protractor, a rotating pointer and a foot that keeps it vertical.
Dimensions: 10 x 3 x 10.5 h cm; Weight: 0.5 kg
A SIMPLE TOOL FOR OBJECTIVE HINDFOOT AXIS EVALUATION
To collect measurement, the instrument is brought close to the hindfoot, with the examinated patient in static position, preferably on a plane raised above the floor to facilitate the reading. The pointer is oriented parallel to the hindfoot axis and the value of valgus or of varism is immediately readable in degrees.
Normality limits cannot be indicated absolutely, since they may vary according to age and loading methods (mono or bipodalic) and the scientific literature itself provides heterogeneous values. However in the child it can be roughly indicated as a threshold of attention, a valgus superior than 8-10°, any varism value and significant asymmetries between the two sides.
In doubtful cases it is not much the absolute value but rather the trend over time that can guide us for a physiological or pathological situation. For this purpose the tool, for its ease of use, is particularly useful by allowing repeated measurements at longer or shorter intervals. This is particularly valid in the young child, where the laxity of the ligamentous structures frequently involves major deviations in valgus of the hindfoot, while loaded , however usually progressive improvement are noticed with growth. Even the difference in value of the hindfoot angle in monopodalic load compared to the bipodalic one, could provide clinicians with important information.
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