A 13-year-old boy with severe haemophilia presented at the National Ce
ntre with gross swelling of his foot and infrapatella area, and report
ed that several months previously he had kicked a football and had ins
tantly developed a bleed in his foot. Despite replacement factor the s
welling failed to subside. He had ambulated for a while using crutches
and when he eventually presented himself the X-rays revealed two sepa
rate pseudotumours. The patient underwent a transfemoral amputation.