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Thirty-six patients with 39 fresh fractures of the calcaneus were investigated by standard radiography and by computerised tomography. It was found that the size and disposition of the fracture fragments and the degree of involvement of the posterior facet of the subtalarjoint were more clearly shown by CT scanning. We recommend this technique for assessment and particularly for pre-operative planning. Fig. 1 Diagram of the position of the ankle and foot in the CT scanner;

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and McCarthy 1984) and the cursor must be accurately placed at each joint. Specimen bones of known length can be measured to an accuracy of 0.2 mm. The procedure takes an experienced person about five minutes, as against at least twice this time for orthoroentgenography. REFERENCES Green wr, Wyatt GM, Anderson M. Orthoroentgenography as a method of measuring the bones of the lower extremities.