TY - BOOK AU - Yasser Mohammad Aly Said AU - Hassan Elbarbary , AU - Naguib Basha , AU - Yehia Tarraf , TI - Evaluation of surgical hip management in cases of spastic cerebral palsy / PY - 2013/// CY - Cairo : PB - Yasser Mohammad Aly Said , KW - CT KW - GMFCS KW - NSA N1 - Thesis (Ph.D.) - Cairo University - Faculty of Medicine - Department of Orthopedic Surgery; Issued also as CD N2 - HIP displacement is the second most common deformity after equinus . These children have normal hips at birth but the hip displaces under the influence of abnomal muscle balance and tone . It is thought that increased tone in the hip flexors and adductors overcomes the relatively weaker extensors and abductors resulting in transfer of the center of hip rotation from the center of the femoral head to the lesser trochanter ER -