A 50-year-old man with haemophilia A had knee radiographs performed while being worked up for chronic knee pain.
The radiographs showed classic features of monoarticular chronic haemophilic arthropathy of the right knee joint. These features are listed below and labelled in figures 1 and 2:
Widened intercondylar notch. Note the discrepancy in interchondylar notch width between the left and right knee.
Flattening of the condylar surface with bulbous femoral condyles (not labelled).
Squared inferior margin of patella.
Periarticular osteoporosis from hyperaemia. Note the increased lucency of periarticular bone in right knee (not labelled).
Epiphyseal overgrowth from hyperaemia. Note the discrepancy between epiphyseal length when comparing the left and right knees.
Premature fusion of growth plate as the right leg is shorter than the left, hinting that the frequent, recurrent bleeding episodes occurred prior to fusion of growth plates. Note how the joint space in the right knee is proximal compared with the...
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