Fig. 4.

Localisation of lesions (calcaneal trabecular bone architecture according to Diard): 1 all lesions, 2 benign lesions, 3 malignant lesions. Trabecular area 6 (radiolucent area) was affected in 64 (80 %) of 80 investigated plain X-rays, whereas areas 1 and 5 only were affected in 9 (11 %) and 16 (20 %) cases, respectively. The lesions were mainly (58 %) located in inferior anterior parts of the calcaneal bone. In 48 (64 %) of 75 benign cases the lesions were restricted either to the inferior anterior part (areas 3, 4 and 6) of the bone, to the central triangular area of rarefacted bone (area 6) or to the anterior plantar bone areas 4 and 6. Malignant lesions were most frequently (68 %) found in the inferior anterior part (areas 3, 4 and 6) of the bone as well