[1] Univ Paris 06, Georges Pompidou European Hosp HEGP, Dept Orthopaed, F-75012 Paris, France
[2] Univ Paris 06, Dept Paediat, Reference Ctr Sickle Cell Dis, F-75012 Paris, France
[3] Univ Paris 06, Orthopaed Dept, Robert Debre Hosp, F-75012 Paris, France
[4] Univ Paris 06, Trousseau Hosp, Orthopaed Dept, F-75012 Paris, France