An original case of bilateral knee flexion of sixty degrees is reported in a twenty-four year old mean, with a beta-thalassemia diagnosed at three years old. The defect of straightening is the result of premature epiphysis fusion, only posterior in this case, and affecting preferentially the tibia. That is the reason why the flexion has been corrected by a bilateral tibial soustraction osteotomy, under the tibial tuberosity. The consolidation of the osteotomies has been obtained without any complications, with a complete extension and normal walk in a man moving only with a wheelchair before surgery. No similar case seems to be described in this kind of pathology.
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