Calcaneo-Scaphoid Coalition

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Abstract
Calcaneo-scaphoid coalition occurs in a number of forms, having one feature in common, namely, a skeletal abnormality of the calcaneo-scaphoid gap. The condition is congenital, but nothing is known of its causation. Ranking at first as merely an anatomical curiosity, it was later recognized to be frequently associated with spasmodic flat-foot. Probably 25% of all cases of spasmodic flat-foot show this skeletal anomaly in some form or other. Clinically, this variety of spasmodic flat-foot is indistinguishable from the better-known condition in which the bones are apparently normal. Diagnosis made radiographically; essential that an oblique lateral view of the foot should be taken. Causal relation of the condition to peroneal spasm. All the usual forms of treatment employed for the relief of spasmodic flat-foot fail when a calcaneo-scaphoid coalition is present. Resection of the offending bar is of no proven value, but may be worth further trial. If symptoms persist, subastragaloid arthrodesis is necessary.

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