Pelvic Support Osteotomy creates an interposition pelvic support andimproves the abductor lever arm thus, improving the patient,s gait pattern.However, conventional prlvic support osteotomies causes limb lengthdiscrepancy and valgus knee deformity which results in accelerated kneearthrosis.To avoid these problems, lizarov used his circular fixator and added asecond distal osteotomy through which gradual lengthening and varisation iscarried.