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Table 2 Adaption of the modified Ficat classification [4] and distribution in study group

From: Hip pathologies in mucopolysaccharidosis type III

Stage 1

Minor changes on radiograph

25%

Stage 2 A

Sclerosis or cysts of femoral head, diffuse porosis

25%

Stage 2 B

Crescentic subchondral line, flattening of the femoral head

28%

Stage 3

Broken contour of the head, normal joint space

16%

Stage 4

Collapse, flattened contour of the femoral head, decreased joint space, osteoarthritis

6%

  1. Percentage distribution of single hips affected by osteonecrosis (n = 30)