[1] Menoufia Univ, Dept Orthoped, Shibin Al Kawm, Egypt
[2] Univ Lleida, Dept Orthoped, Hosp Igualada, Consorci Sanitari LAnoia, Lleida, Spain
[3] UAB, Dept Orthoped, Parc Salut Mar, Barcelona, Spain
[4] Clin Mitrestorres, Hip Unit, iMove Traumatol, Barcelona, Spain
[5] ReSport Clin, Barcelona, Spain
[6] GIPCA, Iber Grp Hip Preservat Surg, Barcelona, Spain
[7] Hosp Esperanza, St Josep de La Muntanya 12, Barcelona 08024, Spain